List of nuclides

Last updated August 29, 2025

This list of nuclides shows observed nuclides that either are stable or, if radioactive, have half-lives longer than one hour. This includes isotopes of the first 105 elements, except for 87 (francium), 102 (nobelium) and 104 (rutherfordium). At least 3,300 nuclides have been experimentally characterized^[1] - this page presently includes 987.

Introduction
List legend
Full list
Theoretically stable nuclides
Observationally stable nuclides having theoretical decay modes other than spontaneous fission (no lower bounds)
Observationally stable nuclides having theoretical decay modes other than spontaneous fission, for which those decays have experimental lower bounds
Primordial radioactive nuclides (half-life > 108 years)
Radionuclides with half-lives of 104 years to 108 years
Radionuclides with half-lives of 10 years to 104 years
Radionuclide with unknown half-life
Radionuclides with half-lives of 1 day to 10 years
Radionuclides with half-lives of 1 hour to 1 day
Radionuclides with half-lives less than 1 hour
See also
Sources
Notes
References
External links

Introduction

There are presently 251 known stable nuclides. Many of these in theory could decay through spontaneous fission, alpha decay, double beta decay, etc. with a very long half-life, but this has not yet been observed. Thus, the number of stable nuclides is subject to change if some of these 251 have radioactive decay observed in the future. In this article, the "stable" nuclides are divided into three tables: one for nuclides that are theoretically stable (meaning no decay mode is possible) except to spontaneous fission, which is not considered plausible in this mass range; one for nuclides that can theoretically undergo forms of decay other than spontaneous fission but have no published lower bound on lifetime from experimental evaluations; and one for nuclides that can theoretically decay and have been examined without detecting any decay, allowing a lower bound to be published. In this last table, where a decay has been predicted theoretically but never observed experimentally (either directly or by finding an excess of the daughter), the theoretical decay mode is given in parentheses, and "> (lifetime in years)" is shown in the half-life column to show this lower limit in scientific notation. Such nuclides are considered to be "stable", also called "observationally stable" indicating the tentative nature of the conclusion, until some decay has been observed. For example, tellurium-123 was reported to be radioactive, but the same experimental group later retracted this report, and it is again listed as stable.

The next group is the primordial radioactive nuclides. These have been measured to be radioactive, or decay products have been identified in natural samples (tellurium-128, barium-130). There are 35 of these (see these nuclides), of which 25 have half-lives longer than 10¹³ years. For most of these 25, decay is difficult to observe, and for most purposes they can be regarded as effectively stable. Bismuth-209 is notable as it is the only naturally occurring isotope of an element long considered stable. The other 10, platinum-190, samarium-147, lanthanum-138, rubidium-87, rhenium-187, lutetium-176, thorium-232, uranium-238, potassium-40, and uranium-235, have half-lives between 7×10⁸ and 5×10¹¹ years, which means they have undergone at least 0.5% depletion since the formation of the Solar System about 4.6×10⁹ years ago, but still exist on Earth in significant quantities. They are the primary source of radiogenic heating and radioactive decay products. Together, there are a total of 286 primordial nuclides.^[a]

The list then covers the other radionuclides with half-lives longer than 1 hour, split into several tables in order of successively shorter lifetimes.

Some nuclides that have half-lives too short to be primordial can be detected in nature as a result of later production by natural processes, mostly in trace amounts. These include radionuclides occurring in the decay chains of primordial uranium and thorium (radiogenic nuclides), such as radon-222. Others are the products of interactions with energetic cosmic rays (the cosmogenic nuclides), such as carbon-14. This gives a total of about 350 naturally occurring nuclides, some of which are difficult to detect. Other nuclides may be occasionally produced naturally by rare cosmogenic interactions or as a result of other natural nuclear reactions (nucleogenic nuclides), and these are generally even less detectable.

Non-primordial nuclides may also be detected in the spectra of stars; technetium is well established,^[3] and others have been claimed. The remaining nuclides are known solely from artificial nuclear transmutations. Some, such as caesium-137 and krypton-85, are detected in the environment, but only (or practically only) from deliberate or accidental release of artificial production, as fission products (from nuclear weapons or nuclear reactors), for industrial or medical uses, or otherwise.

List legend

Each group of radionuclides, starting with the longest-lived primordial radionuclides, is sorted by decreasing half-life, but the tables are sortable by other columns. All columns sort by usual lexicographical order; in the case of the nuclide column this gives order on the mass number A.

No. (number) column

A running positive integer for reference, equal to the position in the tables. This number may change in the future, especially for nuclides with short lives, as better half-life estimates become available.

Nuclide column

Nuclide identifiers are given by their atomic mass number A and the symbol for the corresponding chemical element (corresponding to the unique proton number). In the cases that this is not the ground state, this is indicated by a m for metastable appended to the mass number; the conventional numbers are further appended to distinguish multiple metastable states but '1' is omitted if the others are much less stable.

A, Z, N columns

The total number of protons and neutrons together (A) and the separate numbers of protons (Z) and of neutrons (N).

Energy column

The column labeled "energy" denotes the energy equivalent of the mass of a neutron minus the mass per nucleon of this nuclide (so all nuclides have a positive value) in MeV, formally:

m n - m nuclide / A

, where A = Z + N is the mass number. Note that this means that a higher "energy" value actually means that the nuclide has a lower energy. The mass of the nuclide (in daltons) is

A (m n - E / k)

where E is the energy, m_n is 1.008664916 Da and k = 931.49410242 the conversion factor between MeV and daltons.

Half-life column

The first column shows times in seconds; the second column in the more usual units (years, days, hours). As the first column is converted from the second, it is given enough digits to ensure consistent sorting.

Entries starting with a ">" indicates that no decay has ever been observed, with experiments having established lower limits on the half-life. Such elements are considered stable unless decay is observed (establishing an actual estimate for the half-life). Half-lives are imprecise estimates and may be subject to significant revision. When shown to a smaller than usual number of significant figures, it is not known accurately enough to justify more.

Decay mode column

α	α decay
β⁻	β⁻ decay
β⁻β⁻	double β⁻ decay
ε	electron capture
β⁺	β⁺ decay
β⁺β⁺	double β⁺ decay
SF	spontaneous fission
IT	isomeric transition

Decay modes in parentheses are given for observationally stable nuclides (these and these); they are then those allowed to occur by energy (in the next column), but spontaneous fission (and cluster decay, which is never shown in this table) are neglected as they should never be observed for any of those. Nuclides with multiple significant decay modes have the probability of each decay mode in percent given, in small figures, in parentheses; those less than 0.05% are rounded to zero and omitted, and 100 (>99.5% of observed decays) is not used but replaced by bold unless the only other decays are SF or double beta, assumed to be minority decays if not listed first. If more than one of α, β⁻, β⁺/ε, IT is given without numbers or bold, one can assume no experimental data is available. Note that, by widely used convention, β⁺ (technically positron emission) includes ε, and conversely, if positron emission is energetically possible; the two are never separated on this page.

Decay energy column

Multiple values for (maximal) decay energy for each given decay mode, in respective order. The decay energy listed is for the specific nuclide only, not for the whole decay chain. It includes energy lost to neutrinos.

Notes column

CG: Cosmogenic nuclide.
DP: Naturally occurring decay product (of thorium-232, uranium-238, or uranium-235), including products of neutron reactions other than fission.
ESS: Present in the early Solar System (first few million years), but extinct now as a primordial nuclide. Inherently overlaps with cosmogenic nuclides.
FP: Nuclear fission product ^[b] - may occur naturally from spontaneous fission.
IM: Industry or medically used radionuclide.^[4]

Of the 701 non-primordial nuclides in the tables below, 101 have the label FP (99 true fission products), 65 IM, 32 DP, 24 CG, 13 ESS, and 7 both CG and ESS.

Full list

Theoretically stable nuclides

These are the theoretically stable nuclides, ordered by "energy".

No.	Nuclide	A	Z	N	Energy (MeV)
1	⁵⁶Fe	56	26	30	9.153567
2	⁶²Ni	62	28	34	9.147877
3	⁶⁰Ni	60	28	32	9.145862
4	⁵⁸Fe	58	26	32	9.142938
5	⁵²Cr	52	24	28	9.137037
6	⁵⁷Fe	57	26	31	9.127119
7	⁵⁹Co	59	27	32	9.126046
8	⁵⁴Cr	54	24	30	9.125633
9	⁶¹Ni	61	28	33	9.124129
10	⁵⁵Mn	55	25	30	9.120611
11	⁶⁴Ni	64	28	36	9.119754
12	⁶⁶Zn	66	30	36	9.115258
13	⁵³Cr	53	24	29	9.114435
14	⁶³Cu	63	29	34	9.112272
15	⁶⁵Cu	65	29	36	9.106154
16	⁶⁸Zn	68	30	38	9.100845
17	⁵⁰Ti	50	22	28	9.099861
18	⁵¹V	51	23	28	9.094884
19	⁶⁷Zn	67	30	37	9.084468
20	⁴⁸Ti	48	22	26	9.081488
21	⁷²Ge	72	32	40	9.079465
22	⁷⁰Ge	70	32	38	9.079372
23	⁶⁹Ga	69	31	38	9.076078
24	⁸⁸Sr	88	38	50	9.070438
25	⁷⁴Ge	74	32	42	9.063522
26	⁴⁹Ti	49	22	27	9.062323
27	⁷⁶Se	76	34	42	9.061485
28	⁷¹Ga	71	31	40	9.059218
29	⁷⁸Se	78	34	44	9.058842
30	⁹⁰Zr	90	40	50	9.057631
31	⁸⁹Y	89	39	50	9.056743
32	⁸⁶Sr	86	38	48	9.054160
33	⁸²Kr	82	36	46	9.054126
34	⁸⁴Kr	84	36	48	9.052649
35	⁷³Ge	73	32	41	9.048006
36	⁸⁷Sr	87	38	49	9.046964
37	⁷⁵As	75	33	42	9.045093
38	⁸⁰Kr	80	36	44	9.044984
39	⁷⁷Se	77	34	43	9.040153
40	⁸⁵Rb	85	37	48	9.037998
41	⁹¹Zr	91	40	51	9.037156
42	⁸³Kr	83	36	47	9.034966
43	⁷⁹Br	79	35	44	9.034220
44	⁸¹Br	81	35	46	9.033979
45	⁹²Zr	92	40	52	9.032783
46	⁴⁶Ti	46	22	24	9.030532
47	⁴⁷Ti	47	22	25	9.027336
48	⁴⁴Ca	44	20	24	9.013793
49	⁹⁴Mo	94	42	52	9.011856
50	⁹³Nb	93	41	52	9.009051
51	⁹⁶Mo	96	42	54	8.996229
52	⁹⁵Mo	95	42	53	8.994564
53	⁴²Ca	42	20	22	8.989116
54	³⁸Ar	38	18	20	8.984870
55	⁴⁵Sc	45	21	24	8.983945
56	⁹⁷Mo	97	42	55	8.973806
57	⁹⁸Ru	98	44	54	8.971572
58	⁴³Ca	43	20	23	8.964551
59	¹⁰⁰Ru	100	44	56	8.963517
60	⁹⁹Ru	99	44	55	8.956348
61	³⁴S	34	16	18	8.951675
62	⁴⁰Ar	40	18	22	8.947325
63	¹⁰²Ru	102	44	58	8.944837
64	¹⁰¹Ru	101	44	57	8.942117
65	⁴¹K	41	19	22	8.938623
66	³⁹K	39	19	20	8.938174
67	¹⁰⁴Pd	104	46	58	8.930847
68	³⁷Cl	37	17	20	8.929760
69	¹⁰³Rh	103	45	58	8.925910
70	³⁶S	36	16	20	8.923108
71	¹⁰⁶Pd	106	46	60	8.919460
72	¹⁰⁵Pd	105	46	59	8.913356
73	³⁵Cl	35	17	18	8.900285
74	¹⁰⁸Pd	108	46	62	8.900253
75	¹⁰⁷Ag	107	47	60	8.897514
76	¹¹⁰Cd	110	48	62	8.892718
77	³⁰Si	30	14	16	8.885761
78	¹⁰⁹Ag	109	47	62	8.885300
79	³²S	32	16	16	8.884318
80	³³S	33	16	17	8.876964
81	³¹P	31	15	16	8.859744
82	²⁸Si	28	14	14	8.838935
83	²⁹Si	29	14	15	8.826327
84	¹¹²Cd	112	48	64	8.880077
85	¹¹¹Cd	111	48	63	8.875445
86	¹¹⁴Sn	114	50	64	8.865722
87	¹¹³In	113	49	64	8.862212
88	¹¹⁶Sn	116	50	66	8.860362
89	¹¹⁵Sn	115	50	65	8.854249
90	¹¹⁸Sn	118	50	68	8.848073
91	¹¹⁷Sn	117	50	67	8.843977
92	¹²⁰Sn	120	50	70	8.830537
93	¹¹⁹Sn	119	50	69	8.828201
94	¹²¹Sb	121	51	70	8.811783
95	¹²²Te	122	52	70	8.811606
96	¹²⁴Te	124	52	72	8.801364
97	¹²³Sb	123	51	72	8.796727
98	¹²⁶Te	126	52	74	8.786126
99	¹²⁵Te	125	52	73	8.783505
100	¹²⁸Xe	128	54	74	8.773359
101	¹²⁷I	127	53	74	8.771981
102	¹³⁰Xe	130	54	76	8.762725
103	¹²⁹Xe	129	54	75	8.758904
104	¹³²Xe	132	54	78	8.747695
105	¹³¹Xe	131	54	77	8.746253
106	¹³⁴Ba	134	56	78	8.735133
107	¹³³Cs	133	55	78	8.733515
108	¹³⁶Ba	136	56	80	8.724908
109	¹³⁵Ba	135	56	79	8.722072
110	¹³⁷Ba	137	56	81	8.711628
111	¹³⁸Ba	138	56	82	8.710904
112	²⁷Al	27	13	14	8.708242
113	¹⁴⁰Ce	140	58	82	8.700494
114	¹³⁹La	139	57	82	8.698892
115	²⁶Mg	26	12	14	8.694981
116	¹⁴¹Pr	141	59	82	8.681405
117	¹⁴²Nd	142	60	82	8.676646
118	²⁴Mg	24	12	12	8.651911
119	²⁵Mg	25	12	13	8.599047
120	¹⁵⁶Gd	156	64	92	8.536342
121	¹⁵⁷Gd	157	64	93	8.522478
122	¹⁵⁸Gd	158	64	94	8.518775
123	¹⁵⁹Tb	159	65	94	8.508680
124	²³Na	23	11	12	8.485675
125	¹⁶³Dy	163	66	97	8.478607
126	¹⁶⁴Dy	164	66	98	8.473604
127	²²Ne	22	10	12	8.436087
128	²⁰Ne	20	10	10	8.423422
129	¹⁶O	16	8	8	8.367390
130	²¹Ne	21	10	11	8.344280
131	¹⁹F	19	9	10	8.149612
132	¹⁷O	17	8	9	8.118904
133	¹⁸O	18	8	10	8.114744
134	¹²C	12	6	6	8.071327
135	¹⁵N	15	7	8	8.064594
136	¹⁴N	14	7	7	7.866827
137	¹³C	13	6	7	7.830943
138	⁴He	4	2	2	7.465077
139	¹¹B	11	5	6	7.283337
140	¹⁰B	10	5	5	6.866257
141	⁹Be	9	4	5	6.810483
142	⁷Li	7	3	4	5.941599
143	⁶Li	6	3	3	5.723527
144	³He	3	2	1	3.094327
145	²H	2	1	1	1.503327
146	¹H	1	1	0	0.782327

Observationally stable nuclides having theoretical decay modes other than spontaneous fission (no lower bounds)

Ordered by "energy".

No.	Nuclide	A	Z	N	Energy	Decay mode	Decay energy (MeV)
147	⁸⁰Se	80	34	46	9.043326	(β⁻β⁻)	0.134
148	⁸⁶Kr	86	36	50	9.039532	(β⁻β⁻)	1.256
149	⁸⁴Sr	84	38	46	9.031375	(β⁺β⁺)	1.787
150	¹⁰²Pd	102	46	56	8.933337	(β⁺β⁺)	1.172
151	³⁶Ar	36	18	18	8.911105	(β⁺β⁺)	0.433
152	¹²²Sn	122	50	72	8.808590	(β⁻β⁻)	0.366
153	¹⁵⁰Sm	150	62	88	8.585043	(α)	1.449
154	¹⁵²Sm	152	62	90	8.563227	(α)	0.220
155	¹⁵⁴Gd	154	64	90	8.549985	(α)	0.081
156	¹⁵⁵Gd	155	64	91	8.536341	(α)	0.081
157	¹⁶⁴Er	164	68	96	8.473462	(β⁺β⁺, α)	0.024, 1.304
158	¹⁶⁵Ho	165	67	98	8.464689	(α)	0.139
159	¹⁶⁶Er	166	68	98	8.462482	(α)	0.831
160	¹⁶⁷Er	167	68	99	8.450350	(α)	0.666
161	¹⁶⁸Er	168	68	100	8.446308	(α)	0.553
162	¹⁶⁹Tm	169	69	100	8.433931	(α)	1.200
163	¹⁷⁰Yb	170	70	100	8.428792	(α)	1.738
164	¹⁷¹Yb	171	70	101	8.418182	(α)	1.559
165	¹⁷²Yb	172	70	102	8.415864	(α)	1.310
166	¹⁷³Yb	173	70	103	8.404023	(α)	0.946
167	¹⁷⁴Yb	174	70	104	8.398624	(α)	0.740
168	¹⁷⁵Lu	175	71	104	8.386589	(α)	1.620
169	¹⁸¹Ta	181	73	108	8.338961	(α)	1.526
170	¹⁸⁵Re	185	75	110	8.308204	(α)	2.195
171	¹⁹¹Ir	191	77	114	8.263508	(α)	2.084
172	¹⁹⁴Pt	194	78	116	8.250519	(α)	1.504
173	¹⁹³Ir	193	77	116	8.250259	(α)	1.017
174	¹⁹⁵Pt	195	78	117	8.239516	(α)	1.158
175	¹⁹⁶Pt	196	78	118	8.237896	(α)	0.794
176	¹⁹⁷Au	197	79	118	8.229404	(α)	0.954
177	¹⁹⁸Hg	198	80	118	8.227663	(α)	1.383
178	¹⁹⁹Hg	199	80	119	8.219805	(α)	0.824
179	²⁰⁰Hg	200	80	120	8.218848	(α)	0.718
180	²⁰¹Hg	201	80	121	8.208956	(α)	0.334
181	²⁰²Hg	202	80	122	8.206703	(α)	0.136
182	²⁰³Tl	203	81	122	8.198230	(α)	0.911
183	²⁰⁴Hg	204	80	124	8.192358	(β⁻β⁻)	0.416
184	²⁰⁵Tl	205	81	124	8.187526	(α)	0.157

Observationally stable nuclides having theoretical decay modes other than spontaneous fission, for which those decays have experimental lower bounds

Ordered by the given lower bound on half-life. This should not be considered authoritative without consulting the original source (footnote) as exactly what was measured and how are not reflected here, and some of the values may be misinterpretations. Further, in all cases, this is not an indicator of the probable half-life, which may be much longer (especially for alpha decay), but only the experiment's ability to measure it.

Lower bounds without a specific footnote from:

Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.

No.	Nuclide	A	Z	N	Energy	Half-life (seconds)	Half-life (years)^[c]	Decay mode	Decay energy (MeV)
185	¹³⁴Xe	134	54	80	8.728973	>8.8×10²⁹	>2.8×10²²^[5]	(β⁻β⁻)	0.825
186	⁴⁰Ca	40	20	20	8.942485	>3.1×10²⁹	>9.9×10²¹	(β⁺β⁺)	0.194
187	¹⁸⁴W	184	74	110	8.319737	>2.8×10²⁹	>8.9×10²¹	(α)	1.656
188	¹⁸²W	182	74	108	8.336424	>2.4×10²⁹	>7.7×10²¹	(α)	1.772
189	²⁰⁸Pb	208	82	126	8.175888	>8.2×10²⁸	>2.6×10²¹	(α)	0.519
190	²⁰⁶Pb	206	82	124	8.186791	>7.9×10²⁸	>2.5×10²¹	(α)	1.137
191	¹²⁶Xe	126	54	72	8.779010	>6.0×10²⁸	>1.9×10²¹^[6]	(β⁺β⁺)	0.897
192	²⁰⁷Pb	207	82	125	8.179791	>6.0×10²⁸	>1.9×10²¹	(α)	0.391
193	¹²⁰Te	120	52	68	8.816369	>5.0×10²⁸	>1.6×10²¹	(β⁺β⁺)	1.700
194	¹⁰⁶Cd	106	48	58	8.893327	>3.5×10²⁸	>1.1×10²¹	(β⁺β⁺)	2.770
195	⁵⁸Ni	58	28	30	9.109736	>2.2×10²⁸	>7.0×10²⁰	(β⁺β⁺)	1.926
196	¹⁸³W	183	74	109	8.324699	>2.1×10²⁸	>6.7×10²⁰	(α)	1.680
197	¹⁰⁴Ru	104	44	60	8.918337	>2.0×10²⁸	>6.5×10²⁰^[7]	(β⁻β⁻)	1.300
198	⁵⁴Fe	54	26	28	9.113040	>1.4×10²⁸	>4.4×10²⁰^[8]	(β⁺β⁺)	0.680
199	¹³²Ba	132	56	76	8.741288	>9.5×10²⁷	>3.0×10²⁰	(β⁺β⁺)	0.846
200	¹¹⁰Pd	110	46	64	8.874500	>9.1×10²⁷	>2.9×10²⁰	(β⁻β⁻)	2.000
201	⁹²Mo	92	42	50	9.014860	>6.0×10²⁷	>1.9×10²⁰	(β⁺β⁺)	1.649
202	²⁰⁴Pb	204	82	122	8.194414	>4.4×10²⁷	>1.4×10²⁰^[9]	(α)	1.972
203	¹¹²Sn	112	50	62	8.862944	>3.1×10²⁷	>9.7×10¹⁹^[10]	(β⁺β⁺)	1.922
204	⁹⁶Ru	96	44	52	8.967911	>2.5×10²⁷	>8.0×10¹⁹	(β⁺β⁺)	2.719
205	¹⁹²Os	192	76	116	8.258202	>1.7×10²⁷	>5.3×10¹⁹	(β⁻β⁻, α)	0.413, 0.362
206	¹⁹⁸Pt	198	78	120	8.222378	>1.0×10²⁷	>3.2×10¹⁹^[11]	(β⁻β⁻, α)	1.047, 0.087
207	¹⁶⁰Gd	160	64	96	8.496009	>9.8×10²⁶	>3.1×10¹⁹	(β⁻β⁻)	1.729
208	¹⁴⁴Sm	144	62	82	8.640577	>4.4×10²⁶	>1.4×10¹⁹^[12]	(β⁺β⁺)	1.781
209	¹⁹⁰Os	190	76	114	8.275045	>3.8×10²⁶	>1.2×10¹⁹^[13]	(α)	1.378
210	⁶⁴Zn	64	30	34	9.102634	>3.5×10²⁶	>1.1×10¹⁹^[14]	(β⁺β⁺)	1.096
211	⁷⁴Se	74	34	40	9.047175	>2.2×10²⁶	>7.0×10¹⁸^[15]	(β⁺β⁺)	1.209
212	¹⁸⁶W	186	74	112	8.299873	>1.3×10²⁶	>4.1×10¹⁸	(β⁻β⁻, α)	0.491, 1.123
213	⁷⁰Zn	70	30	40	9.065109	>1.2×10²⁶	>3.8×10¹⁸	(β⁻β⁻)	0.998
214	¹⁸⁸Os	188	76	112	8.290138	>1.0×10²⁶	>3.3×10¹⁸^[13]	(α)	2.143
215	¹⁴³Nd	143	60	83	8.658792	>9.8×10²⁵	>3.1×10¹⁸	(α)	0.521
216	¹⁴⁸Nd	148	60	88	8.594388	>9.5×10²⁵	>3.0×10¹⁸	(β⁻β⁻, α)	1.929, 0.599
217	¹⁴²Ce	142	58	84	8.666666	>9.1×10²⁵	>2.9×10¹⁸	(β⁻β⁻, α)	1.417, 1.298
218	¹⁷⁹Hf	179	72	107	8.353293	>8.5×10²⁵	>2.7×10¹⁸^[16]	(α)	1.806
219	¹⁹⁶Hg	196	80	116	8.233710	>7.9×10²⁵	>2.5×10¹⁸	(β⁺β⁺, α)	0.820, 2.027
220	¹⁵⁴Sm	154	62	92	8.541857	>7.3×10²⁵	>2.3×10¹⁸	(β⁻β⁻)	1.251
221	¹⁴⁶Nd	146	60	86	8.625649	>5.0×10²⁵	>1.6×10¹⁸	(β⁻β⁻, α)	0.070, 1.182
222	⁵⁰Cr	50	24	26	9.076517	>4.1×10²⁵	>1.3×10¹⁸	(β⁺β⁺)	1.167
223	¹⁷⁸Hf	178	72	106	8.365958	>4.1×10²⁵	>1.3×10¹⁸^[16]	(α)	2.083
224	¹⁷⁷Hf	177	72	105	8.370139	>3.5×10²⁵	>1.1×10¹⁸^[16]	(α)	2.245
225	¹⁵⁶Dy	156	66	90	8.523443	>3.2×10²⁵	>1.0×10¹⁸^{[n 1]}	(β⁺β⁺, α)	2.011, 1.758
226	¹⁵³Eu	153	63	90	8.550893	>1.8×10²⁵	>5.5×10¹⁷	(α)	0.274
227	¹⁸⁰Hf	180	72	108	8.347930	>1.5×10²⁵	>4.6×10¹⁷^[16]	(α)	1.283
228	¹⁰⁸Cd	108	48	60	8.897735	>1.3×10²⁵	>4.1×10¹⁷	(β⁺β⁺)	0.272
229	¹⁷⁰Er	170	68	102	8.424945	>1.3×10²⁵	>4.1×10¹⁷	(β⁻β⁻, α)	0.654, 0.050
230	¹³⁸Ce	138	58	80	8.705878	>1.3×10²⁵	>4.0×10¹⁷^[18]	(β⁺β⁺)	0.694
231	^180mTa	180	73	107	8.342767	>9.1×10²⁴	>2.9×10¹⁷^[19]	(β⁻, ε, IT, α)	0.783, 0.929, 0.077, 2.103
232	¹⁷⁶Hf	176	72	104	8.381427	>8.5×10²⁴	>2.7×10¹⁷^[16]	(α)	2.255
233	⁴⁶Ca	46	20	26	9.009047	>5.7×10²⁴	>1.8×10¹⁷^[20]	(β⁻β⁻)	0.988
234	¹⁷⁶Yb	176	70	106	8.375271	>5.0×10²⁴	>1.6×10¹⁷	(β⁻β⁻, α)	1.083, 0.570
235	⁹⁴Zr	94	40	54	8.999698	>3.5×10²⁴	>1.1×10¹⁷	(β⁻β⁻)	1.144
236	¹²⁴Sn	124	50	74	8.782914	>3.2×10²⁴	>1.0×10¹⁷	(β⁻β⁻)	2.287
237	¹⁶²Dy	162	66	96	8.492234	>3.2×10²⁴	>1.0×10¹⁷^[17]	(α)	0.085
238	¹³⁶Ce	136	58	78	8.707122	>3.0×10²⁴	>9.6×10¹⁶^[18]	(β⁺β⁺)	2.419
239	¹¹⁴Cd	114	48	66	8.860985	>2.9×10²⁴	>9.2×10¹⁶	(β⁻β⁻)	0.540
240	¹²³Te	123	52	71	8.796302	>2.9×10²⁴	>9.2×10¹⁶^[21]	(ε)	0.052
241	¹⁴⁵Nd	145	60	85	8.632963	>1.9×10²⁴	>6.0×10¹⁶	(α)	1.578
242	¹⁹²Pt	192	78	114	8.260353	>1.9×10²⁴	>6.0×10¹⁶	(α)	2.418
243	¹⁶¹Dy	161	66	95	8.494067	>1.1×10²⁴	>3.5×10¹⁶^[17]	(α)	0.344
244	¹⁶⁰Dy	160	66	94	8.506816	>2.7×10²³	>8.5×10¹⁵^[17]	(α)	0.439
245	¹⁸⁹Os	189	76	113	8.277599	>1.1×10²³	>3.5×10¹⁵^[13]	(α)	1.976
246	¹⁸⁷Os	187	76	111	8.291746	>1.0×10²³	>3.2×10¹⁵^[13]	(α)	2.720
247	¹⁴⁹Sm	149	62	87	8.589058	>6.3×10²²	>2.0×10¹⁵	(α)	1.870
248	¹⁵⁸Dy	158	66	92	8.516973	>3.2×10²²	>1.0×10¹⁵^[17]	(β⁺β⁺, α)	0.283, 0.875
249	¹⁶²Er	162	68	94	8.480852	>4.4×10²¹	>1.4×10¹⁴	(β⁺β⁺, α)	1.844, 1.646
250	¹⁶⁸Yb	168	70	98	8.437845	>4.1×10²¹	>1.3×10¹⁴	(β⁺β⁺, α)	1.422, 1.951
251	⁹⁸Mo	98	42	56	8.970426	>3.2×10²¹	>1.0×10¹⁴	(β⁻β⁻)	0.112

↑ Nubase value, for alpha decay only. Double electron capture limited only to 6.1×10¹⁴ (ground state) by ^[17]

Primordial radioactive nuclides (half-life > 10⁸ years)

Ordered by half-life, those without a specific footnote from

Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.

No.	Nuclide	A	Z	N	Energy	Half-life (seconds)	Half-life (years)^[c]	Decay mode	Decay energy (MeV)
252	¹²⁸Te	128	52	76	8.743261	7.10×10³¹	2.25×10²⁴	β⁻β⁻	0.868
253	¹²⁴Xe	124	54	70	8.778264	3.47×10²⁹	1.1×10²²^[22]	εε	2.864
254	⁷⁸Kr	78	36	42	9.022349	2.90×10²⁹	9.2×10²¹	εε	2.846
255	¹³⁶Xe	136	54	82	8.706805	6.88×10²⁸	2.18×10²¹	β⁻β⁻	2.462
256	⁷⁶Ge	76	32	44	9.034656	6.375×10²⁸	2.02×10²¹	β⁻β⁻	2.039
257	¹³⁰Ba	130	56	74	8.742574	3.2×10²⁸	1×10²¹^{[n 1]}	εε	2.620
258	¹³⁰Te	130	52	78	8.766578	2.496×10²⁸	7.9×10²⁰	β⁻β⁻	2.530
259	⁸²Se	82	34	48	9.017596	2.764×10²⁷	8.76×10¹⁹	β⁻β⁻	2.995
260	⁴⁸Ca	48	20	28	8.992452	1.767×10²⁷	5.6×10¹⁹	β⁻β⁻	4.274
261	¹¹⁶Cd	116	48	68	8.836146	8.489×10²⁶	2.69×10¹⁹	β⁻β⁻	2.809
262	²⁰⁹Bi	209	83	126	8.158689	6.343×10²⁶	2.01×10¹⁹	α	3.137
263	⁹⁶Zr	96	40	56	8.961359	7.384×10²⁶	2.34×10¹⁹	β⁻β⁻	3.348
264	¹⁵⁰Nd	150	60	90	8.562594	2.935×10²⁶	9.3×10¹⁸	β⁻β⁻	3.367
265	¹⁰⁰Mo	100	42	58	8.933167	2.231×10²⁶	7.07×10¹⁸	β⁻β⁻	3.035
266	¹⁵¹Eu	151	63	88	8.565759	1.452×10²⁶	4.6×10¹⁸	α	1.964
267	¹⁸⁰W	180	74	106	8.347127	5.018×10²⁵	1.59×10¹⁸^[25]	α	2.509
268	⁵⁰V	50	23	27	9.055759	8.552×10²⁴	2.71×10¹⁷	β⁺^{[n 2]}	2.205
269	¹⁷⁴Hf	174	72	102	8.392287	1.199×10²⁴	3.8×10¹⁶^[26]	α	2.497
270	¹¹³Cd	113	48	65	8.859372	2.537×10²³	8.04×10¹⁵	β⁻	0.321
271	¹⁴⁸Sm	148	62	86	8.607423	1.988×10²³	6.3×10¹⁵	α	1.986
272	¹⁴⁴Nd	144	60	84	8.652947	7.227×10²²	2.29×10¹⁵	α	1.905
273	¹⁸⁶Os	186	76	110	8.302508	6.3×10²²	2.0×10¹⁵	α	2.823
274	¹¹⁵In	115	49	66	8.849910	1.392×10²²	4.41×10¹⁴	β⁻	0.499
275	¹⁵²Gd	152	64	88	8.562868	3.408×10²¹	1.08×10¹⁴	α	2.203
276	¹⁸⁴Os	184	76	108	8.311850	3.53×10²⁰	1.12×10¹³	α	2.963
277	¹⁹⁰Pt	190	78	112	8.267764	1.524×10¹⁹	4.83×10¹¹	α	3.252
278	¹⁴⁷Sm	147	62	85	8.610593	3.364×10¹⁸	1.066×10¹¹	α	2.310
279	¹³⁸La	138	57	81	8.698320	3.250×10¹⁸	1.03×10¹¹	β⁺(65), β⁻(35)	1.737, 1.044
280	⁸⁷Rb	87	37	50	9.043718	1.568×10¹⁸	4.97×10¹⁰	β⁻	0.283
281	¹⁸⁷Re	187	75	112	8.291732	1.313×10¹⁸	4.16×10¹⁰	β⁻	0.0026
282	¹⁷⁶Lu	176	71	105	8.374665	1.168×10¹⁸	3.70×10¹⁰	β⁻^{[n 3]}	1.193
283	²³²Th	232	90	142	7.918533	4.418×10¹⁷	1.40×10¹⁰	α, SF	4.083
284	²³⁸U	238	92	146	7.872551	1.408×10¹⁷	4.463×10⁹	α, SF, β⁻β⁻	4.270, 1.145
285	⁴⁰K	40	19	21	8.909707	3.938×10¹⁶	1.248×10⁹	β⁻(89), β⁺(11)	1.311, 1.505
286	²³⁵U	235	92	143	7.897198	2.222×10¹⁶	7.04×10⁸	α, SF	4.679

↑ The two experimental values^[23]^[24] are discordant, with a total range of (0.5–2.7)×10²¹ years; the value in the table is a rough average.
↑ Also theoretically capable of β⁻ decay
↑ Theoretically capable of electron capture^[27]

Radionuclides with half-lives of 10⁴ years to 10⁸ years

Ordered by half-life. Some of these are known to have been present in the early Solar System (marked "ESS", meaning the first few million years of the Solar System's history) from an excess of their decay products.^[28]

No.	Nuclide	Z	N	Energy	Half-life (seconds)	Half-life (years)^[c]	Decay mode	Notes
287	¹⁴⁶Sm	62	84	8.626136	2.903×10¹⁵	9.20×10⁷^[2]	α	ESS^[28]
288	²⁴⁴Pu	94	150	7.826221	2.566×10¹⁵	8.13×10⁷	α, SF (0.12)	interstellar,^[29] ESS^[28]
289	⁹²Nb	41	51	9.010980	1.095×10¹⁵	3.47×10⁷	β⁺	CG,^[30] ESS^[28]
290	²³⁶U	92	144	7.891470	7.391×10¹⁴	2.342×10⁷	α, SF	DP
291	²⁰⁵Pb	82	123	8.187279	5.365×10¹⁴	1.70×10⁷	β⁺	ESS^[28]
292	¹²⁹I	53	76	8.757397	5.093×10¹⁴	1.614×10⁷	β⁻	CG, FP, ESS^[28]
293	²⁴⁷Cm	96	151	7.806008	4.923×10¹⁴	1.56×10⁷	α	ESS^[28]
294	¹⁸²Hf	72	110	8.324399	2.809×10¹⁴	8.90×10⁶	β⁻	ESS^[28]
295	¹⁰⁷Pd	46	61	8.897197	2.051×10¹⁴	6.5×10⁶	β⁻	FP, ESS^[28]
296	⁹⁷Tc	43	54	8.970503	1.329×10¹⁴	4.21×10⁶	β⁺
297	⁹⁸Tc	43	55	8.953246	1.325×10¹⁴	4.2×10⁶	β⁻
298	⁵³Mn	25	28	9.103175	1.168×10¹⁴	3.7×10⁶	β⁺	CG, ESS^[28]
299	^210mBi	83	127	8.140473	9.594×10¹³	3.04×10⁶	α
300	⁶⁰Fe	26	34	9.094861	8.268×10¹³	2.62×10⁶	β⁻	CG,^[31] interstellar,^[32] ESS^[28]
301	²³⁷Np	93	144	7.881989	6.766×10¹³	2.144×10⁶	α, SF	DP
302	¹⁵⁰Gd	64	86	8.576454	5.649×10¹³	1.79×10⁶	α
303	⁹³Zr	40	53	9.008069	5.081×10¹³	1.61×10⁶	β⁻	FP
304	¹⁵⁴Dy	66	88	8.528457	4.418×10¹³	1.40×10⁶^[33]	α
305	¹⁰Be	4	6	6.810657	4.377×10¹³	1.387×10⁶	β⁻	CG, ESS^[28]
306	¹³⁵Cs	55	80	8.720082	4.197×10¹³	1.33×10⁶	β⁻	FP
307	²⁶Al	13	13	8.540954	2.263×10¹³	7.17×10⁵	β⁺	CG, ESS^[28]
308	²⁴²Pu	94	148	7.845218	1.183×10¹³	3.75×10⁵	α, SF
309	²⁰⁸Bi	83	125	8.162049	1.161×10¹³	3.68×10⁵	β⁺
310	²⁴⁸Cm	96	152	7.799586	1.098×10¹³	3.48×10⁵	α (92), SF (8.4)
311	⁷⁹Se	34	45	9.032310	1.032×10¹³	3.3×10⁵	β⁻	FP
312	³⁶Cl	17	19	8.891380	9.499×10¹²	3.01×10⁵	β⁻(98), β⁺(1.9)	CG, IM
313	²³⁴U	92	142	7.908308	7.747×10¹²	2.455×10⁵	α, SF	DP
314	¹²⁶Sn	50	76	8.754026	7.258×10¹²	2.3×10⁵	β⁻	FP
315	⁸¹Kr	36	45	9.030513	7.227×10¹²	2.29×10⁵	β⁺	CG
316	⁹⁹Tc	43	56	8.953379	6.662×10¹²	2.111×10⁵	β⁻	FP
317	^186mRe	75	111	8.295958	6.312×10¹²	2×10⁵	IT
318	²³³U	92	141	7.912873	5.024×10¹²	1.592×10⁵	α, SF	DP
319	²³⁶Np	93	143	7.887514	4.828×10¹²	1.53×10⁵	β⁺(86), β⁻(14), α (0.16)
320	⁴¹Ca	20	21	8.928347	3.137×10¹²	9.9×10⁴	β⁺	CG, ESS^[28]
321	⁵⁹Ni	28	31	9.107863	2.556×10¹²	8.1×10⁴	β⁺
322	²³⁰Th	90	140	7.937136	2.379×10¹²	7.54×10⁴	α, SF	DP
323	¹³⁷La	57	80	8.707101	1.893×10¹²	6×10⁴	β⁺
324	²⁰²Pb	82	120	8.199714	1.657×10¹²	5.25×10⁴	β⁺
325	²³¹Pa	91	140	7.926627	1.030×10¹²	3.27×10⁴	α, SF	DP
326	²³⁹Pu	94	145	7.868022	7.609×10¹¹	2.411×10⁴	α, SF	DP, IM
327	⁹⁴Nb	41	53	8.990099	6.438×10¹¹	2.04×10⁴	β⁻	CG^[30]

Radionuclides with half-lives of 10 years to 10⁴ years

Ordered by half-life.

No.	Nuclide	Z	N	Energy	Half-life (seconds)	Half-life (years)^[c]	Decay mode	Notes
328	²⁵⁰Cm	96	154	7.779371	2.62×10¹¹	8300^{[n 1]}	SF, α, β⁻
329	²⁴⁵Cm	96	149	7.822329	2.60×10¹¹	8250	α, SF
330	²²⁹Th	90	139	7.942127	2.498×10¹¹	7920	α	DP
331	²⁴³Am	95	148	7.836035	2.319×10¹¹	7350	α, SF
332	²⁴⁰Pu	94	146	7.862465	2.070×10¹¹	6561	α, SF
333	¹⁴C	6	8	7.855620	1.799×10¹¹	5700	β⁻	CG, IM
334	⁹³Mo	42	51	9.004693	1.53×10¹¹	4839^[35]	β⁺
335	²⁴⁶Cm	96	150	7.816781	1.485×10¹¹	4700	α, SF
336	¹⁶³Ho	67	96	8.478591	1.442×10¹¹	4570	β⁺
337	²²⁶Ra	88	138	7.966597	5.049×10¹⁰	1600	α	DP
338	²⁴⁷Bk	97	150	7.806182	4.35×10¹⁰	1380	α, SF
339	^166mHo	67	99	8.451273	3.574×10¹⁰	1133	β⁻
340	²⁵¹Cf	98	153	7.775969	2.83×10¹⁰	900	α, SF
341	⁹¹Nb	41	50	9.023327	2.15×10¹⁰	680	β⁺
342	¹⁹⁴Hg	80	114	8.237271	1.41×10¹⁰	450	β⁺
343	^108mAg	47	61	8.881439	1.385×10¹⁰	439	β⁺(91), IT (8.7)
344	²⁴¹Am	95	146	7.851676	1.364×10¹⁰	432.6	α, SF	IM
345	²⁴⁹Cf	98	151	7.791305	1.108×10¹⁰	351	α, SF
346	³⁹Ar	18	21	8.923686	8.457×10⁹	268^{[n 2]}	β⁻	CG
347	^192m2Ir	77	115	8.251875	7.605×10⁹	241	IT
348	¹⁵⁸Tb	65	93	8.511055	5.68×10⁹	180	β⁺(83), β⁻(17)
349	³²Si	14	18	8.823856	4.95×10⁹	157	β⁻	CG
350	^242mAm	95	147	7.841913	4.450×10⁹	141	IT, α (0.46), SF
351	²⁰⁹Po	84	125	8.149633	3.913×10⁹	124	α, β⁺(0.45)
352	⁶³Ni	28	35	9.111210	3.194×10⁹	101	β⁻	IM
353	¹⁵¹Sm	62	89	8.565251	2.985×10⁹	94.6	β⁻	FP
354	²³⁸Pu	94	144	7.877358	2.768×10⁹	87.7	α, SF	DP, IM
355	¹⁴⁸Gd	64	84	8.586706	2.74×10⁹	86.9^[36]	α
356	¹⁵⁷Tb	65	92	8.522096	2.24×10⁹	71	β⁺
357	²³²U	92	140	7.922143	2.174×10⁹	68.9	α, SF
358	⁴⁴Ti	22	22	8.924702	1.865×10⁹	59.1	β⁺
359	¹⁹³Pt	78	115	8.249965	1.58×10⁹	50	β⁺
360	^121mSn	50	71	8.808499	1.385×10⁹	43.9	IT (78), β⁻(22)	FP
361	¹⁵⁰Eu	63	87	8.569974	1.164×10⁹	36.9	β⁺
362	⁴²Ar	18	24	8.890923	1.038×10⁹	32.9	β⁻
363	²⁰⁷Bi	83	124	8.168209	9.852×10⁸	31.22	β⁺
364	^178m2Hf	72	106		9.783×10⁸	31	IT
365	¹³⁷Cs	55	82	8.703047	9.480×10⁸	30.04	β⁻	FP, IM
366	²⁴³Cm	96	147	7.836004	9.183×10⁸	29.1	α, β⁺(0.3), SF
367	⁹⁰Sr	38	52	9.026239	9.123×10⁸	28.91	β⁻	FP, IM
368	²¹⁰Pb	82	128	8.141462	7.006×10⁸	22.2	β⁻, α	DP, IM
369	²²⁷Ac	89	138	7.957447	6.871×10⁸	21.77	β⁻(99), α (1.4)	DP
370	²⁴⁴Cm	96	148	7.831763	5.715×10⁸	18.11	α, SF
371	¹⁴⁵Pm	61	84	8.631838	5.586×10⁸	17.7	β⁺, α
372	^93mNb	41	52		5.087×10⁸	16.1	IT	FP
373	²⁴¹Pu	94	147	7.851590	4.522×10⁸	14.33	β⁻, α, SF
374	^113mCd	48	65		4.383×10⁸	13.9	β⁻, IT (0.10)	FP
375	¹⁵²Eu	63	89	8.550897	4.266×10⁸	13.52	β⁺(72), β⁻(28)
376	²⁵⁰Cf	98	152	7.786640	4.128×10⁸	13.08	α, SF (0.08)
377	³H	1	2	3.087994	3.888×10⁸	12.32	β⁻	CG, IM
378	⁸⁵Kr	36	49	9.029919	3.385×10⁸	10.73	β⁻	FP, IM
379	¹³³Ba	56	77	8.729624	3.326×10⁸	10.54	β⁺

↑ Only SF has been observed with a half-life 11,300 years; the value given theoretically estimates alpha- and beta-decay branches, which is quite uncertain.^[34]
↑ Nubase value. However, a recent direct study: P. Adhikari; et al. (2025). "Direct Measurement of the Half-Life of ³⁹Ar from 3.4 Years of Data with the DEAP-3600 Detector". The European Physical Journal C . 85 (7): 728. doi:10.1140/epjc/s10052-025-14289-5. found 302 years, a statistically significant discrepancy to be explained.

Radionuclide with unknown half-life

No decay has been observed, but not primordial so does not qualify as "observationally stable".

No.	Nuclide	Z	N	Energy (MeV)	Half-life (seconds)	Half-life (years)^[c]	Decay modes	Notes
380	²⁴⁸Bk	97	151	7.796811	>2.84×10⁸	> 9 y	α, β⁻, β⁺

Radionuclides with half-lives of 1 day to 10 years

Ordered by half-life. The second half-life column in this table has been made unsortable, as the mixture of days and years will not sort properly. Resorting by half-life may be done no less by using the number or the half-life in seconds columns.

No.	Nuclide	Z	N	Energy	Half-life (seconds)	Half-life ^[c]	Decay mode	Notes
381	¹⁵⁴Eu	63	91	8.537200	2.711×10⁸	8.59 y	β⁻, β⁺	FP
382	¹⁹⁴Os	76	118	8.238508	1.893×10⁸	6.0 y	β⁻
383	²²⁸Ra	88	140	7.944390	1.815×10⁸	5.75 y	β⁻	DP
384	¹⁴⁶Pm	61	85	8.615574	1.745×10⁸	5.53 y	β⁺(66), β⁻(34)
385	⁶⁰Co	27	33	9.098811	1.664×10⁸	5.27 y	β⁻	IM
386	¹⁵⁵Eu	63	92	8.534711	1.496×10⁸	4.74 y	β⁻	FP
387	¹⁰¹Rh	45	56	8.936753	1.284×10⁸	4.07 y	β⁺
388	²⁰⁴Tl	81	123	8.190671	1.194×10⁸	3.78 y	β⁻(97), β⁺(2.9)	IM
389	^102mRh	45	57	8.920680	1.181×10⁸	3.74 y	β⁺, IT (0.2)
390	¹⁷⁴Lu	71	103	8.390726	1.045×10⁸	3.31 y	β⁺
391	²⁰⁸Po	84	124	8.155315	9.145×10⁷	2.898 y	α, β⁺
392	²³⁶Pu	94	142	7.889536	9.019×10⁷	2.858 y	α, SF
393	¹²⁵Sb	51	74	8.777367	8.705×10⁷	2.759 y	β⁻	FP
394	⁵⁵Fe	26	29	9.116407	8.698×10⁷	2.756 y	β⁺
395	²⁵²Cf	98	154	7.769605	8.347×10⁷	2.645 y	α (97), SF (3.1)	IM
396	¹⁴⁷Pm	61	86	8.609068	8.279×10⁷	2.623 y	β⁻	FP
397	²²Na	11	11	8.306891	8.211×10⁷	2.602 y	β⁺	CG
398	¹³⁴Cs	55	79	8.719768	6.517×10⁷	2.065 y	β⁻, β⁺	FP
399	¹⁷¹Tm	69	102	8.417620	6.059×10⁷	1.92 y	β⁻
400	²²⁸Th	90	138	7.953906	6.035×10⁷	1.913 y	α	DP
401	¹⁷²Hf	72	100	8.399252	5.901×10⁷	1.87 y	β⁺
402	¹⁷⁹Ta	73	106	8.352703	5.743×10⁷	1.82 y	β⁺
403	¹⁷³Lu	71	102	8.400147	4.323×10⁷	1.37 y	β⁺
404	²⁵²Es	99	153	7.764621	4.075×10⁷	1.291 y	α (78), β⁺(22)
405	¹⁰⁹Cd	48	61	8.883327	3.986×10⁷	1.263 y	β⁺
406	²³⁵Np	93	142	7.896669	3.422×10⁷	1.084 y	β⁺, α
407	¹⁰⁶Ru	44	62	8.885686	3.212×10⁷	1.018 y	β⁻	FP
408	¹⁴⁴Pm	61	83	8.636751	3.136×10⁷	0.99 y	β⁺
409	¹⁴⁵Sm	62	83	8.627590	2.938×10⁷	340 d	β⁺
410	²⁴⁸Cf	98	150	7.800198	2.881×10⁷	333.5 d	α, SF
411	⁴⁹V	23	26	9.050040	2.851×10⁷	330 d	β⁺
412	²⁴⁹Bk	97	152	7.790805	2.827×10⁷	327.2 d	β⁻, α, SF
413	⁵⁴Mn	25	29	9.100131	2.696×10⁷	312.08 d	β⁺, β⁻	IM
414	^119mSn	50	69		2.532×10⁷	293.1 d	IT	FP
415	¹⁴⁴Ce	58	86	8.629918	2.461×10⁷	284.89 d	β⁻	FP
416	²⁵⁴Es	99	155	7.748524	2.382×10⁷	275.7 d	α, β⁻, SF
417	⁵⁷Co	27	30	9.112454	2.348×10⁷	271.81 d	β⁺	IM
418	⁶⁸Ge	32	36	9.056327	2.342×10⁷	271.05 d	β⁺	IM
419	¹⁴³Pm	61	82	8.651509	2.290×10⁷	265 d	β⁺
420	^110m2Ag	47	63	8.865355	2.159×10⁷	249.86 d	β⁻(99), IT (1.3)	IM
421	⁶⁵Zn	30	35	9.085352	2.108×10⁷	243.94 d	β⁺	IM
422	¹⁵³Gd	64	89	8.547731	2.079×10⁷	240.6 d	β⁺	IM
423	¹⁰²Rh	45	57		1.788×10⁷	207 d	β⁺(78), β⁻(22)
424	¹⁹⁵Au	79	116	8.238353	1.607×10⁷	186.01 d	β⁺
425	^184mRe	75	109	8.310670	1.531×10⁷	177.25 d	IT (75), β⁺(25)
426	^194m2Ir	77	117	8.238025	1.477×10⁷	171 d	β⁻
427	^121mTe	52	69	8.800749	1.423×10⁷	164.7 d	IT (89), β⁺(11)
428	²⁴²Cm	96	146	7.844860	1.407×10⁷	162.8 d	α, SF
429	⁴⁵Ca	20	25	8.978261	1.405×10⁷	162.61 d	β⁻
430	^177m3Lu	71	106	8.361829	1.386×10⁷	160.4 d	β⁻(77), IT (23)
431	¹⁵⁹Dy	66	93	8.506378	1.248×10⁷	144.4 d	β⁺
432	^174mLu	71	103		1.227×10⁷	142 d	IT (99), ε (0.6)
433	²¹⁰Po	84	126	8.147295	1.196×10⁷	138.4 d	α	DP
434	¹³⁹Ce	58	81	8.696881	1.189×10⁷	137.64 d	β⁺
435	¹²³Sn	50	73	8.785311	1.116×10⁷	129.2 d	β⁻	FP
436	¹⁷⁰Tm	69	101	8.423096	1.111×10⁷	128.6 d	β⁻, β⁺(0.13)
437	¹⁵¹Gd	64	87	8.562685	1.070×10⁷	123.9 d	β⁺, α
438	¹⁸¹W	74	107	8.337924	1.045×10⁷	120.96 d	β⁺
439	⁷⁵Se	34	41	9.033581	1.035×10⁷	119.8 d	β⁺	IM
440	^123mTe	52	71		1.030×10⁷	119.2 d	IT
441	¹¹³Sn	50	63	8.853035	9.943×10⁶	115.08 d	β⁺
442	¹⁸²Ta	73	109	8.326456	9.914×10⁶	114.7 d	β⁻
443	⁸⁸Y	39	49	9.029272	9.213×10⁶	106.63 d	β⁺
444	^127mTe	52	75	8.765759	9.167×10⁶	106.1 d	IT (98), β⁻(2.1)	FP
445	²⁵⁷Fm	100	157	7.726619	8.683×10⁶	100.5 d	α, SF (0.2)
446	¹⁶⁸Tm	69	99	8.436316	8.044×10⁶	93.1 d	β⁺, β⁻
447	¹⁴⁹Eu	63	86	8.584395	8.044×10⁶	93.1 d	β⁺
448	¹⁸⁵Os	76	109	8.302730	8.031×10⁶	92.95 d	β⁺
449	^97mTc	43	54		7.871×10⁶	91.1 d	IT (96), ε (3.9)
450	³⁵S	16	19	8.895510	7.549×10⁶	87.37 d	β⁻	CG
451	⁸³Rb	37	46	9.024038	7.448×10⁶	86.2 d	β⁺
452	⁴⁶Sc	21	25	8.979091	7.237×10⁶	83.76 d	β⁻	IM
453	⁸⁸Zr	40	48	9.021589	7.206×10⁶	83.4 d	β⁺
454	⁷³As	33	40	9.043341	6.938×10⁶	80.3 d	β⁺
455	⁵⁶Co	27	29	9.072031	6.673×10⁶	77.24 d	β⁺
456	¹⁸⁵W	74	111	8.305866	6.489×10⁶	75.1 d	β⁻
457	¹⁹²Ir	77	115		6.378×10⁶	73.82 d	β⁻(95), ε (4.8)	IM
458	¹⁶⁰Tb	65	95	8.495346	6.247×10⁶	72.3 d	β⁻
459	⁵⁸Co	27	31	9.103153	6.121×10⁶	70.84 d	β⁺
460	¹⁸³Re	75	108	8.321661	6.048×10⁶	70 d	β⁺
461	¹⁷⁵Hf	72	103	8.382665	6.039×10⁶	69.90 d^[37]	β⁺
462	¹⁸⁸W	74	114	8.277003	6.028×10⁶	69.77 d	β⁻
463	⁸⁵Sr	38	47	9.025480	5.603×10⁶	64.85 d	β⁺
464	⁹⁵Zr	40	55	8.972989	5.532×10⁶	64.03 d	β⁻	FP
465	^95mTc	43	52	8.976359	5.363×10⁶	62.0 d	β⁺(96), IT (3.9)
466	^91mNb	41	50		5.258×10⁶	60.86 d	IT (97), ε (3.4)
467	²⁵⁴Cf	98	156	7.751087	5.227×10⁶	60.5 d	SF, α (0.3)
468	¹²⁴Sb	51	73	8.777943	5.194×10⁶	60.12 d	β⁻
469	¹²⁵I	53	72	8.782019	5.131×10⁶	59.39 d	β⁺	IM
470	⁹¹Y	39	52	9.020174	5.055×10⁶	58.51 d	β⁻	FP
471	^125mTe	52	73		4.959×10⁶	57.4 d	IT	FP
472	¹⁴⁸Eu	63	85	8.586882	4.709×10⁶	54.5 d	β⁺, α
473	⁷Be	4	3	5.818470	4.598×10⁶	53.22 d	β⁺	CG
474	²⁵⁸Md	101	157	7.715948	4.457×10⁶	51.6 d	α, SF
475	⁸⁹Sr	38	51	9.039969	4.369×10⁶	50.56 d	β⁻	FP, IM
476	^114mIn	49	65	8.846608	4.278×10⁶	49.51 d	IT (97), β⁺(3.2)
477	¹⁴⁶Gd	64	82	8.592512	4.171×10⁶	48.27 d	β⁺
478	²⁰³Hg	80	123	8.195806	4.027×10⁶	46.61 d	β⁻
479	²³⁷Pu	94	143	7.881060	3.943×10⁶	45.64 d	β⁺, α
480	^115mCd	48	67	8.835754	3.850×10⁶	44.6 d	β⁻	FP
481	⁵⁹Fe	26	33	9.099516	3.845×10⁶	44.50 d	β⁻	IM
482	¹⁸¹Hf	72	109	8.333272	3.662×10⁶	42.39 d	β⁻
483	¹⁰⁵Ag	47	58	8.900547	3.567×10⁶	41.29 d	β⁺
484	^148mPm	61	87	8.589800	3.567×10⁶	41.29 d	β⁻(96), IT (4.2)
485	²⁵⁵Es	99	156	7.741567	3.439×10⁶	39.8 d	β⁻(92), α (8.0), SF
486	¹⁰³Ru	44	59	8.918500	3.391×10⁶	39.245 d	β⁻	FP
487	¹²⁷Xe	54	73	8.766768	3.140×10⁶	36.342 d	β⁺
488	¹⁸⁴Re	75	109		3.059×10⁶	35.4 d	β⁺
489	³⁷Ar	18	19	8.907752	3.025×10⁶	35.01 d	β⁺	CG
490	⁹⁵Nb	41	54	8.984821	3.023×10⁶	34.99 d	β⁻	FP
491	^129mTe	52	77	8.744953	2.903×10⁶	33.6 d	IT (64), β⁻(36)	FP
492	⁸⁴Rb	37	47	9.020732	2.836×10⁶	32.82 d	β⁺(96), β⁻(3.9)
493	²⁴¹Cm	96	145	7.848492	2.834×10⁶	32.8 d	β⁺(99), α (1.0)
494	¹⁴¹Ce	58	83	8.677286	2.808×10⁶	32.51 d	β⁻	FP
495	¹⁶⁹Yb	70	99	8.428546	2.766×10⁶	32.014 d	β⁺	IM
496	²⁴⁰Cm	96	144	7.855805	2.627×10⁶	30 d	α, SF
497	²⁶⁰Md	101	159	7.699789	2.402×10⁶	27.8 d	SF
498	⁵¹Cr	24	27	9.080127	2.393×10⁶	27.702 d	β⁺	IM
499	²³³Pa	91	142	7.910426	2.331×10⁶	26.98 d	β⁻	DP
500	³³P	15	18	8.869434	2.190×10⁶	25.35 d	β⁻
501	⁸²Sr	38	44	8.998254	2.190×10⁶	25.35 d	β⁺	IM
502	^179m2Hf	72	107		2.160×10⁶	25.0 d	IT
503	²³⁴Th	90	144	7.897763	2.083×10⁶	24.11 d	β⁻	DP
504	¹⁴⁷Eu	63	84	8.598879	2.082×10⁶	24.1 d	β⁺, α
505	¹⁷⁸W	74	104	8.354563	1.866×10⁶	21.6 d	β⁺
506	²⁵³Es	99	154	7.759019	1.769×10⁶	20.47 d	α, SF
507	²³⁰U	92	138	7.933871	1.748×10⁶	20.23 d	α
508	¹²¹Te	52	69		1.668×10⁶	19.31 d	ε
509	²²⁷Th	90	137	7.957644	1.615×10⁶	18.693 d	α	DP, IM
510	⁸⁶Rb	37	49	9.033502	1.611×10⁶	18.645 d	β⁻, β⁺
511	²⁵³Cf	98	155	7.757885	1.539×10⁶	17.81 d	β⁻, α (0.3)
512	⁷⁴As	33	41	9.028895	1.535×10⁶	17.8 d	β⁺(66), β⁻(34)
513	²³⁰Pa	91	139	7.931436	1.503×10⁶	17.4 d	β⁺(92), β⁻(7.8), α
514	¹⁰³Pd	46	57	8.920638	1.468×10⁶	16.99 d	β⁺	IM
515	⁹⁹Rh	45	54	8.935711	1.391×10⁶	16.1 d	β⁺
516	⁴⁸V	23	25	8.997890	1.380×10⁶	15.97 d	β⁺
517	¹⁵⁶Eu	63	93	8.520642	1.312×10⁶	15.19 d	β⁻	FP
518	¹⁹¹Os	76	115	8.261870	1.295×10⁶	14.99 d	β⁻
519	²⁰⁵Bi	83	122	8.174069	1.288×10⁶	14.91 d	β⁺
520	²²⁵Ra	88	137	7.973576	1.280×10⁶	14.82 d	β⁻, α^[38]	DP
521	³²P	15	17	8.830865	1.233×10⁶	14.269 d	β⁻	CG, IM
522	^117mSn	50	67		1.204×10⁶	13.94 d	IT	FP
523	¹⁴³Pr	59	84	8.652258	1.172×10⁶	13.57 d	β⁻	FP
524	¹⁸⁹Ir	77	112	8.274783	1.140×10⁶	13.2 d	β⁺
525	¹³⁶Cs	55	81	8.706171	1.124×10⁶	13.01 d	β⁻
526	¹²⁶I	53	73	8.769026	1.117×10⁶	12.93 d	β⁺(53), β⁻(47)
527	¹⁴⁰Ba	56	84	8.666120	1.102×10⁶	12.753 d	β⁻	FP
528	¹²⁶Sb	51	75	8.757042	1.067×10⁶	12.35 d	β⁻	FP
529	²⁰²Tl	81	121	8.199956	1.064×10⁶	12.31 d	β⁺
530	^131mXe	54	77		1.032×10⁶	11.948 d	IT	FP
531	¹⁹⁰Ir	77	113	8.264755	1.015×10⁶	11.751 d	β⁺
532	¹³¹Ba	56	75	8.733037	9.953×10⁵	11.52 d	β⁺
533	⁷¹Ge	32	39	9.055943	9.908×10⁵	11.468 d	β⁺
534	²²³Ra	88	135	7.994042	9.880×10⁵	11.435 d	α	DP, IM
535	¹⁴⁷Nd	60	87	8.602973	9.487×10⁵	10.98 d	β⁻	FP
536	²⁴⁶Pu	94	152	7.805494	9.366×10⁵	10.84 d	β⁻
537	^193mIr	77	116		9.098×10⁵	10.53 d	IT
538	¹⁸⁸Pt	78	110	8.272514	8.778×10⁵	10.2 d	β⁺, α
539	^92mNb	41	51		8.740×10⁵	10.12 d	β⁺
540	²²⁵Ac	89	136	7.975159	8.570×10⁵	9.919 d	α	DP, IM
541	¹³¹Cs	55	76	8.743541	8.371×10⁵	9.69 d	β⁺	IM
542	¹²⁵Sn	50	75	8.758515	8.324×10⁵	9.63 d	β⁻	FP
543	¹⁶⁹Er	68	101	8.431852	8.115×10⁵	9.39 d	β⁻	IM
544	¹⁴⁹Gd	64	85	8.575576	8.018×10⁵	9.28 d	β⁺, α
545	¹⁶⁷Tm	69	98	8.445866	7.992×10⁵	9.25 d	β⁺
546	^129mXe	54	75		7.672×10⁵	8.88 d	IT
547	²⁰⁶Po	84	122	8.159590	7.603×10⁵	8.8 d	β⁺(95), α (5.4)
548	⁷²Se	34	38	9.014300	7.258×10⁵	8.40 d	β⁺
549	^106mAg	47	59	8.890639	7.154×10⁵	8.28 d	β⁺
550	¹⁷¹Lu	71	100	8.409532	7.125×10⁵	8.25 d	β⁺
551	¹³¹I	53	78	8.738842	6.934×10⁵	8.025 d	β⁻	FP, IM
552	²⁵⁷Es	99	158	7.723468	6.653×10⁵	7.7 d	β⁻, SF
553	¹¹¹Ag	47	64	8.866111	6.422×10⁵	7.43 d	β⁻	FP
554	¹⁶¹Tb	65	96	8.490383	6.003×10⁵	6.948 d	β⁻	FP
555	²³⁷U	92	145	7.879800	5.834×10⁵	6.752 d	β⁻	DP
556	¹⁷²Lu	71	101	8.401217	5.789×10⁵	6.70 d	β⁺
557	¹⁷⁷Lu	71	106		5.741×10⁵	6.644 d	β⁻	IM
558	¹³²Cs	55	77	8.731599	5.599×10⁵	6.48 d	β⁺(98), β⁻(1.6)
559	²⁰⁶Bi	83	123	8.168551	5.394×10⁵	6.24 d	β⁺
560	¹⁹⁶Au	79	117	8.230205	5.327×10⁵	6.17 d	β⁺(93), β⁻(7)
561	⁵⁶Ni	28	28	9.033899	5.249×10⁵	6.08 d	β⁺
562	¹¹⁸Te	52	66	8.814726	5.184×10⁵	6.00 d	β⁺
563	¹⁴⁵Eu	63	82	8.609245	5.124×10⁵	5.93 d	β⁺
564	^120mSb	51	69	8.808194	4.977×10⁵	5.76 d	β⁺
565	⁵²Mn	25	27	9.046431	4.831×10⁵	5.59 d	β⁺
566	¹⁴⁸Pm	61	87		4.638×10⁵	5.37 d	β⁻
567	¹⁵⁶Tb	65	91	8.520667	4.622×10⁵	5.35 d	β⁺
568	¹³³Xe	54	79	8.730302	4.534×10⁵	5.25 d	β⁻	FP, IM
569	¹⁵⁵Tb	65	90	8.531031	4.523×10⁵	5.23 d^[39]	β⁺
570	¹⁸³Ta	73	110	8.318847	4.406×10⁵	5.1 d	β⁻
571	²¹⁰Bi	83	127		4.330×10⁵	5.01 d	β⁻, α	DP
572	²⁴⁵Bk	97	148	7.819020	4.277×10⁵	4.95 d	β⁺, α (0.12)
573	^119mTe	52	67	8.801773	4.061×10⁵	4.70 d	β⁺
574	¹⁴⁶Eu	63	83	8.599560	3.983×10⁵	4.61 d	β⁺
575	⁴⁷Ca	20	27	8.972181	3.919×10⁵	4.54 d	β⁻
576	²³⁴Np	93	141	7.900571	3.802×10⁵	4.4 d	β⁺
577	^101mRh	45	56		3.752×10⁵	4.34 d	ε (93), IT (7.2)
578	^193mPt	78	115		3.741×10⁵	4.33 d	IT
579	⁹⁶Tc	43	53	8.965255	3.698×10⁵	4.28 d	β⁺
580	²³¹U	92	139	7.924977	3.629×10⁵	4.2 d	β⁺, α
581	¹⁷⁵Yb	70	105	8.383902	3.616×10⁵	4.19 d	β⁻
582	¹²⁴I	53	71	8.775884	3.608×10⁵	4.18 d	β⁺	IM
583	^195mPt	78	117		3.465×10⁵	4.01 d	IT
584	¹²⁷Sb	51	76	8.754005	3.326×10⁵	3.85 d	β⁻	FP
585	²²²Rn	86	136	7.997573	3.302×10⁵	3.82 d	α	DP
586	¹⁸⁶Re	75	111		3.213×10⁵	3.72 d	β⁻(93), ε (7.5)	IM
587	²²⁴Ra	88	136	7.987277	3.138×10⁵	3.63 d	α	DP
588	¹⁰⁰Pd	46	54	8.923587	3.136×10⁵	3.63 d	β⁺
589	^95mNb	41	54		3.119×10⁵	3.61 d	IT (94), β⁻(5.6)	FP
590	¹⁶⁶Dy	66	100	8.448376	2.938×10⁵	3.40 d	β⁻
591	¹⁴⁰Nd	60	80	8.673113	2.912×10⁵	3.37 d	β⁺
592	⁴⁷Sc	21	26	9.014564	2.894×10⁵	3.35 d	β⁻	IM
593	⁸⁷Y	39	48	9.025565	2.873×10⁵	3.33 d	β⁺
594	⁸⁹Zr	40	49	9.024912	2.821×10⁵	3.27 d	β⁺
595	⁶⁷Ga	31	36	9.069532	2.818×10⁵	3.26 d	β⁺	IM
596	¹³²Te	52	80	8.716646	2.768×10⁵	3.20 d	β⁻	FP
597	¹³⁴Ce	58	76	8.704432	2.730×10⁵	3.16 d	β⁺
598	¹⁹⁹Au	79	120	8.217534	2.712×10⁵	3.14 d	β⁻
599	²⁰¹Tl	81	120	8.206561	2.628×10⁵	3.04 d	β⁺	IM
600	²⁵³Fm	100	153	7.757691	2.592×10⁵	3.0 d	β⁺(88), α (12)
601	⁹⁷Ru	44	53	8.959080	2.451×10⁵	2.84 d	β⁺
602	¹⁹¹Pt	78	113	8.258228	2.445×10⁵	2.83 d	β⁺
603	¹¹¹In	49	62	8.867688	2.423×10⁵	2.80 d	β⁺	IM
604	⁹⁹Mo	42	57	8.939669	2.374×10⁵	2.75 d	β⁻	FP, IM
605	¹²²Sb	51	71	8.795346	2.353×10⁵	2.72 d	β⁻(98), β⁺(2.4)
606	⁷¹As	33	38	9.027581	2.350×10⁵	2.72 d	β⁺
607	¹⁹⁷Hg	80	117	8.226358	2.337×10⁵	2.71 d	β⁺
608	¹⁹⁸Au	79	119	8.220732	2.328×10⁵	2.69 d	β⁻	IM
609	¹⁸²Re	75	107	8.321053	2.311×10⁵	2.68 d	β⁺
610	⁹⁰Y	39	51	9.032294	2.306×10⁵	2.67 d	β⁻	FP, IM
611	¹⁷²Tm	69	103	8.404932	2.290×10⁵	2.65 d	β⁻
612	⁶⁷Cu	29	38	9.076086	2.226×10⁵	2.58 d	β⁻	IM
613	^44m3Sc	21	23	8.924627	2.110×10⁵	2.44 d	IT, β⁺
614	¹²⁸Ba	56	72	8.738523	2.100×10⁵	2.43 d	β⁺
615	⁷⁷Br	35	42	9.022431	2.053×10⁵	2.38 d	β⁺
616	¹⁶⁶Yb	70	96	8.442340	2.041×10⁵	2.36 d	β⁺
617	²³⁹Np	93	146	7.864999	2.036×10⁵	2.36 d	β⁻	DP
618	¹⁷⁷Ta	73	104	8.363553	2.029×10⁵	2.35 d	β⁺
619	¹⁵³Tb	65	88	8.537471	2.022×10⁵	2.34 d	β⁺
620	⁶⁶Ni	28	38	9.071423	1.966×10⁵	2.28 d	β⁻
621	²⁴⁷Pu	94	153	7.791975	1.961×10⁵	2.27 d	β⁻
622	^198m2Au	79	119		1.963×10⁵	2.27 d	IT
623	¹¹⁵Cd	48	67		1.925×10⁵	2.23 d	β⁻	FP
624	¹⁴⁹Pm	61	88	8.581871	1.911×10⁵	2.21 d	β⁻	FP
625	^133mXe	54	79		1.899×10⁵	2.20 d	IT	FP
626	²⁰³Pb	82	121	8.193431	1.869×10⁵	2.16 d	β⁺
627	²⁴⁰Am	95	145	7.856694	1.829×10⁵	2.12 d	β⁺, α
628	²³⁸Np	93	145	7.871931	1.814×10⁵	2.10 d	β⁻
629	¹⁷²Er	68	104	8.399752	1.775×10⁵	2.05 d	β⁻
630	¹⁷⁰Lu	71	99	8.408445	1.738×10⁵	2.01 d	β⁺
631	⁷²Zn	30	42	9.017591	1.674×10⁵	1.94 d	β⁻
632	¹⁵³Sm	62	91	8.545614	1.666×10⁵	1.93 d	β⁻	FP, IM
633	²⁰²Pt	78	124	8.183209	1.584×10⁵	1.83 d	β⁻
634	⁴⁸Sc	21	27	8.998327	1.572×10⁵	1.82 d	β⁻
635	²⁴⁶Bk	97	149	7.811287	1.555×10⁵	1.80 d	β⁺
636	^195mHg	80	115	8.229399	1.498×10⁵	1.73 d	IT (54), β⁺(46)
637	¹⁸⁸Ir	77	111	8.275200	1.494×10⁵	1.73 d	β⁺
638	¹⁴⁰La	57	83	8.673620	1.450×10⁵	1.68 d	β⁻	FP, IM
639	^254mEs	99	155		1.415×10⁵	1.64 d	β⁻, α (0.3), ε (0.08)
640	⁶⁹Ge	32	37	9.043800	1.406×10⁵	1.63 d	β⁺
641	^133mBa	56	77		1.400×10⁵	1.62 d	IT, ε
642	⁷⁷As	33	44	9.031283	1.398×10⁵	1.62 d	β⁻	FP
643	¹¹⁹Sb	51	68	8.823235	1.375×10⁵	1.59 d	β⁺
644	¹⁴⁷Gd	64	83	8.584001	1.370×10⁵	1.59 d	β⁺
645	¹⁹⁴Au	79	115	8.237626	1.369×10⁵	1.58 d	β⁺
646	²²⁹Pa	91	138	7.940769	1.339×10⁵	1.55 d	β⁺, α (0.5)
647	²⁴⁶Cf	98	148	7.810792	1.285×10⁵	1.49 d	α, SF
648	⁵⁷Ni	28	29	9.055222	1.282×10⁵	1.48 d	β⁺
649	¹⁰⁵Rh	45	60	8.907956	1.272×10⁵	1.47 d	β⁻	FP
650	⁸²Br	35	47	9.016407	1.270×10⁵	1.47 d	β⁻
651	⁷⁹Kr	36	43	9.013644	1.261×10⁵	1.46 d	β⁺
652	^137mCe	58	79	8.696327	1.238×10⁵	1.43 d	IT (99), β⁺(0.8)
653	¹⁶⁹Lu	71	98	8.414978	1.226×10⁵	1.42 d	β⁺
654	¹⁴³Ce	58	85	8.642041	1.189×10⁵	1.38 d	β⁻	FP
655	²⁵¹Es	99	152	7.774467	1.188×10⁵	1.38 d	β⁺, α (0.5)
656	^131mTe	52	79	8.720392	1.169×10⁵	1.35 d	β⁻(74), IT (26)	FP
657	⁸³Sr	38	45	8.996568	1.167×10⁵	1.35 d	β⁺
658	¹²⁹Cs	55	74	8.749622	1.154×10⁵	1.34 d	β⁺
659	²³²Pa	91	141	7.916379	1.140×10⁵	1.32 d	β⁻
660	¹⁶⁵Tm	69	96	8.452758	1.082×10⁵	1.25 d	β⁺
661	¹⁹³Os	76	117	8.244348	1.074×10⁵	1.24 d	β⁻
662	²²⁶Ac	89	137	7.963761	1.057×10⁵	1.22 d	β⁻(83), β⁺(17), α
663	¹⁶⁰Er	68	92	8.484190	1.029×10⁵	1.19 d	β⁺
664	¹⁵¹Pm	61	90	8.557387	1.022×10⁵	1.18 d	β⁻	FP
665	^135mBa	56	79		1.012×10⁵	1.17 d	IT
666	¹²¹Sn	50	71		9.731×10⁴	1.13 d	β⁻	FP
667	¹⁶⁶Ho	67	99		9.652×10⁴	1.12 d	β⁻	IM
668	⁷⁶As	33	43	9.022505	9.454×10⁴	1.09 d	β⁻
669	²⁰⁰Tl	81	119	8.206567	9.396×10⁴	1.09 d	β⁺
670	⁷²As	33	39	9.018966	9.360×10⁴	1.08 d	β⁺
671	²³¹Th	90	141	7.924932	9.187×10⁴	1.06 d	β⁻	DP
672	²⁵²Fm	100	152	7.766498	9.140×10⁴	1.06 d	α, SF
673	^156m2Tb	65	91		8.78×10⁴	1.02 d	IT
674	¹⁸⁹Re	75	114	8.272269	8.748×10⁴	1.01 d	β⁻

Radionuclides with half-lives of 1 hour to 1 day

Ordered by half-life.

No.	Nuclide	Z	N	Energy	Half-life (seconds)	Half-life (hours)	Decay mode	Notes
675	^197mHg	80	117		8.575×10⁴	23.8	IT
676	¹⁸⁷W	74	113	8.284722	8.571×10⁴	23.8	β⁻
677	^248mBk	97	151		8.532×10⁴	23.7	β⁻(70), ε (30)
678	¹⁷³Hf	72	101	8.391617	8.496×10⁴	23.6	β⁺
679	⁹⁶Nb	41	55	8.963036	8.406×10⁴	23.4	β⁻
680	^154m2Tb	65	89	8.526912	8.17×10⁴	22.7	β⁺
681	^236mNp	93	143		8.1×10⁴	22.5	ε (50), β⁻(50)
682	⁴³K	19	24	8.922327	8.028×10⁴	22.3	β⁻
683	²²⁸Pa	91	137	7.944468	7.92×10⁴	22	β⁺(98), α (2)
684	¹⁸²Os	76	106	8.316432	7.862×10⁴	21.8	β⁺
685	⁴⁸Cr	24	24	8.963390	7.762×10⁴	21.6	β⁺
686	^154m1Tb	65	89		7.74×10⁴	21.5	β⁺
687	²⁰⁰Pb	82	118	8.202542	7.740×10⁴	21.5	β⁺
688	¹¹²Pd	46	66	8.842185	7.574×10⁴	21.0	β⁻	FP
689	²⁸Mg	12	16	8.607706	7.529×10⁴	20.9	β⁻	CG
690	¹³³I	53	80	8.717094	7.499×10⁴	20.8	β⁻	FP
691	¹⁰⁰Rh	45	55	8.927167	7.488×10⁴	20.8	β⁺
692	¹²²Xe	54	68	8.770959	7.236×10⁴	20.1	β⁺
693	²⁵⁵Fm	100	155	7.742704	7.225×10⁴	20.1	α, SF
694	¹⁸¹Re	75	106	8.328294	7.164×10⁴	19.9	β⁺
695	¹⁹⁷Pt	78	119	8.225756	7.161×10⁴	19.9	β⁻
696	¹⁹⁴Ir	77	117		6.966×10⁴	19.4	β⁻
697	⁹⁵Tc	43	52		6.933×10⁴	19.3	β⁺
698	¹⁴²Pr	59	83	8.661417	6.883×10⁴	19.1	β⁻, ε
699	¹³⁵La	57	78	8.713179	6.808×10⁴	18.9	β⁺
700	^200mAu	79	121	8.202877	6.732×10⁴	18.7	β⁻(84), IT (16)
701	¹⁵⁹Gd	64	95	8.502576	6.652×10⁴	18.5	β⁻	FP
702	¹⁵²Tb	65	87	8.536591	6.436×10⁴	17.9^[40]	β⁺
703	¹³⁵Ce	58	77	8.698179	6.372×10⁴	17.7	β⁺
704	¹⁹³Au	79	114	8.244353	6.354×10⁴	17.7	β⁺
705	¹⁵¹Tb	65	86	8.545692	6.339×10⁴	17.6	β⁺, α
706	⁵⁵Co	27	28	9.053647	6.311×10⁴	17.5	β⁺
707	¹⁸⁸Re	75	113	8.278860	6.122×10⁴	17.0	β⁻	IM
708	¹²⁵Xe	54	71	8.768864	6.073×10⁴	16.9	β⁺
709	⁹⁷Zr	40	57	8.926451	6.030×10⁴	16.7	β⁻	FP
710	¹⁸⁶Ir	77	109	8.281935	5.990×10⁴	16.6	β⁺
711	⁸⁶Zr	40	46	8.975979	5.940×10⁴	16.5	β⁺
712	⁷⁶Br	35	41	8.996183	5.832×10⁴	16.2	β⁺
713	¹¹⁹Te	52	67		5.778×10⁴	16.1	β⁺
714	²⁴²Am	95	147		5.767×10⁴	16.0	β⁻(83), ε (17)
715	¹⁷⁰Hf	72	98	8.402210	5.764×10⁴	16.0	β⁺
716	²⁶⁸Db	105	163	7.635133	5.76×10⁴	16^{[n 1]}	α (51), SF (49)^[41]
717	¹⁵⁷Eu	63	94	8.513792	5.465×10⁴	15.2	β⁻	FP
718	²⁴Na	11	13	8.422082	5.384×10⁴	15.0	β⁻	CG, IM
719	⁷⁶Kr	36	40	8.979406	5.328×10⁴	14.8	β⁺
720	⁸⁶Y	39	47	8.993234	5.306×10⁴	14.7	β⁺
721	²¹¹Rn	86	125	8.112825	5.256×10⁴	14.6	β⁺(73), α (27)
722	⁹⁰Nb	41	49	8.989727	5.256×10⁴	14.6	β⁺
723	¹⁸⁵Ir	77	108	8.289382	5.184×10⁴	14.4	β⁺
724	^182mRe	75	107		5.090×10⁴	14.1	β⁺
725	²⁴⁰U	92	148	7.851682	5.076×10⁴	14.1	β⁻
726	⁷²Ga	31	41	9.023958	5.049×10⁴	14.0	β⁻
727	^69mZn	30	39	9.056536	4.949×10⁴	13.7	IT, β⁻
728	¹⁰⁹Pd	46	63	8.875061	4.892×10⁴	13.6	β⁻	FP
729	^87mY	39	48		4.813×10⁴	13.4	IT (98), β⁺(1.6)
730	¹²³I	53	70	8.786311	4.760×10⁴	13.2	β⁺	IM
731	^191mOs	76	115		4.716×10⁴	13.1	IT
732	¹⁸³Os	76	107	8.309907	4.680×10⁴	13.0	β⁺
733	^150mEu	63	87		4.608×10⁴	12.8	β⁻(89), β⁺(11)
734	⁶⁴Cu	29	35	9.093581	4.572×10⁴	12.7	β⁺(62), β⁻(38)	IM
735	²⁰⁰Pt	78	122	8.204342	4.536×10⁴	12.6	β⁻
736	¹³⁰I	53	77	8.740035	4.450×10⁴	12.4	β⁻
737	⁴²K	19	23	8.905175	4.448×10⁴	12.4	β⁻	IM
738	¹⁷¹Hf	72	99	8.395480	4.356×10⁴	12.1	β⁺
739	²³⁹Am	95	144	7.864666	4.284×10⁴	11.9	β⁺, α
740	^193mHg	80	113	8.231483	4.248×10⁴	11.8	β⁺(93), IT (7.2)
741	²⁰³Bi	83	120	8.177436	4.234×10⁴	11.8	β⁺
742	²⁰⁴Bi	83	121	8.172651	4.039×10⁴	11.2	β⁺
743	⁷⁷Ge	32	45	8.996185	4.036×10⁴	11.2	β⁻	FP
744	²⁶⁶Lr	103	163		3.96×10⁴	11^{[n 1]}	SF
745	¹⁸⁹Pt	78	111	8.264359	3.913×10⁴	10.9	β⁺
746	¹⁹⁵Hg	80	115		3.848×10⁴	10.7	β⁺
747	²¹²Pb	82	130	8.106928	3.826×10⁴	10.6	β⁻	DP, IM
748	¹⁷⁵Ta	73	102	8.370813	3.78×10⁴	10.5	β⁺
749	¹⁸⁷Ir	77	110	8.283713	3.78×10⁴	10.5	β⁺
750	²⁴⁵Pu	94	151	7.813752	3.78×10⁴	10.5	β⁻
751	¹⁶⁵Er	68	97	8.462406	3.730×10⁴	10.4	β⁺
752	⁹³Y	39	54	8.976951	3.665×10⁴	10.2	β⁻	FP
753	²⁴⁴Am	95	149	7.825914	3.604×10⁴	10.0	β⁻
754	¹⁵⁴Tb	65	89		3.598×10⁴	9.99	β⁺
755	¹⁵⁵Dy	66	89	8.517521	3.564×10⁴	9.9	β⁺
756	^183mOs	76	107		3.564×10⁴	9.9	β⁺(85), IT(15)
757	⁹¹Sr	38	53	8.990503	3.474×10⁴	9.65	β⁻	FP
758	^196m2Au	79	117		3.457×10⁴	9.60	IT
759	¹⁵⁶Sm	62	94	8.516007	3.384×10⁴	9.4	β⁻	FP
760	¹²⁷Te	52	75		3.366×10⁴	9.35	β⁻	FP
761	²⁰¹Pb	82	119	8.196989	3.359×10⁴	9.33	β⁺
762	^152mEu	63	89		3.352×10⁴	9.31	β^-(73), β⁺(27)
763	⁶⁶Ga	31	35	9.036843	3.349×10⁴	9.30	β⁺
764	⁶²Zn	30	32	9.057957	3.309×10⁴	9.19	β⁺
765	¹³⁵Xe	54	81	8.711453	3.290×10⁴	9.14	β⁻	FP
766	¹²⁸Sb	51	77	8.732343	3.244×10⁴	9.01	β⁻	FP
767	¹³⁷Ce	58	79		3.24×10⁴	9.0	β⁺
768	^58mCo	27	31		3.187×10⁴	8.85	IT, β⁺
769	²³⁴Pu	94	140	7.898892	3.168×10⁴	8.8	β⁺(94), α (6)
770	¹⁸⁴Ta	73	111	8.304154	3.132×10⁴	8.7	β⁻
771	²⁵⁰Es	99	151	7.778407	3.096×10⁴	8.6	β⁺
772	¹⁰¹Pd	46	55	8.917149	3.049×10⁴	8.47	β⁺
773	⁵²Fe	26	26	9.000789	2.979×10⁴	8.28	β⁺
774	¹⁷³Tm	69	104	8.396524	2.966×10⁴	8.24	β⁻
775	¹⁸⁰Ta	73	107		2.935×10⁴	8.15	ε (85), β⁻(15)
776	¹⁵⁷Dy	66	91	8.513544	2.930×10⁴	8.14	β⁺
777	²¹⁰At	85	125	8.128337	2.916×10⁴	8.1	β⁺, α (0.2)
778	¹⁷⁶Ta	73	103	8.363202	2.912×10⁴	8.09	β⁺
779	¹⁶⁶Tm	69	97	8.444183	2.772×10⁴	7.70	β⁺
780	²⁵⁶Es	99	157	7.730742	2.736×10⁴	7.6	β⁻
781	¹⁷¹Er	68	103	8.408901	2.706×10⁴	7.52	β⁻
782	¹⁹⁹Tl	81	118	8.212333	2.671×10⁴	7.42	β⁺
783	²¹¹At	85	126	8.126527	2.597×10⁴	7.21	β⁺(58), α (42)	IM
784	⁷³Se	34	39	9.005821	2.574×10⁴	7.15	β⁺
785	^93mMo	42	51		2.466×10⁴	6.85	IT, β⁺(0.1)
786	²³⁴Pa	91	143	7.898930	2.412×10⁴	6.70	β⁻	DP
787	¹³⁵I	53	82	8.691994	2.369×10⁴	6.58	β⁻	FP
788	¹⁰⁷Cd	48	59	8.884271	2.340×10⁴	6.50	β⁺
789	^82mRb	37	45	8.999608	2.330×10⁴	6.47	β⁺
790	¹⁵³Dy	66	87	8.523288	2.304×10⁴	6.4	β⁺, α
791	¹²⁷Cs	55	72	8.750383	2.250×10⁴	6.25	β⁺
792	²²⁸Ac	89	139	7.944591	2.214×10⁴	6.15	β⁻	DP
793	^99mTc	43	56		2.162×10⁴	6.01	IT, β⁻	FP, IM
794	¹⁴⁵Pr	59	86	8.620514	2.154×10⁴	5.98	β⁻	FP
795	^189mOs	76	113		2.092×10⁴	5.81	IT
796	²⁰⁷Po	84	123	8.154158	2.088×10⁴	5.80	β⁺, α
797	^111mPd	46	65	8.844589	2.003×10⁴	5.56	IT (77), β⁻(23)
798	⁹⁰Mo	42	48	8.962072	2.002×10⁴	5.56	β⁺
799	^180mHf	72	108		1.991×10⁴	5.53	IT, β⁻(0.3)
800	²⁵⁷Md	101	156	7.725040	1.987×10⁴	5.52	ε (85), α (15)
801	^139mNd	60	79	8.659529	1.980×10⁴	5.50	β⁺(87), IT (13)
802	²⁰⁹At	85	124	8.132954	1.948×10⁴	5.41	β⁺(96), α (4.0)
803	¹¹³Ag	47	66	8.841531	1.933×10⁴	5.37	β⁻
804	^156m1Tb	65	91		1.908×10⁴	5.3	IT
805	¹⁹⁸Tl	81	117	8.210166	1.908×10⁴	5.3	β⁺
806	²⁵¹Fm	100	151	7.768590	1.908×10⁴	5.30	β⁺(98), α (1.8)
807	^133mCe	58	75	8.690771	1.836×10⁴	5.1	β⁺
808	¹³⁸Nd	60	78	8.665661	1.814×10⁴	5.04	β⁺
809	^160mHo	67	93	8.485877	1.807×10⁴	5.02	IT (73), β⁺(27)
810	²⁴⁴Bk	97	147	7.822491	1.807×10⁴	5.02	β⁺, α
811	^118m2Sb	51	67	8.814963	1.800×10⁴	5.00	β⁺
812	²⁴³Pu	94	149	7.833648	1.784×10⁴	4.96	β⁻
813	¹⁹²Au	79	113	8.242036	1.778×10⁴	4.94	β⁺
814	¹¹⁰In	49	61	8.857464	1.771×10⁴	4.92	β⁺
815	⁹⁴Tc	43	51	8.966583	1.758×10⁴	4.88	β⁺
816	^85mY	39	46	8.986880	1.750×10⁴	4.86	β⁺
817	⁷³Ga	31	42	9.026112	1.750×10⁴	4.86	β⁻
818	¹⁹²Hg	80	112	8.238051	1.746×10⁴	4.85	β⁺
819	^99mRh	45	54		1.69×10⁴	4.7	β⁺
820	²⁴³Bk	97	146	7.829801	1.66×10⁴	4.6	β⁺, α (0.15)
821	²⁶⁴Lr	103	161		1.66×10⁴	4.6^{[n 1]}	SF^[41]
822	¹³²La	57	75	8.705721	1.652×10⁴	4.59	β⁺
823	¹⁷⁹Lu	71	108	8.345428	1.652×10⁴	4.59	β⁻
824	⁸¹Rb	37	44	9.002871	1.646×10⁴	4.57	β⁺	IM
825	^115mIn	49	66		1.615×10⁴	4.49	IT (95), β⁻(5.0)	FP
826	^85mKr	36	49		1.613×10⁴	4.48	β⁻(79), IT (21)	FP
827	¹⁰⁵Ru	44	61	8.889689	1.598×10⁴	4.44	β⁻	FP
828	^80mBr	35	45	9.018872	1.591×10⁴	4.42	IT
829	¹³⁹Pr	59	80	8.681565	1.588×10⁴	4.41	β⁺
830	¹²⁹Sb	51	78	8.727358	1.584×10⁴	4.40	β⁻	FP
831	¹⁰⁹In	49	60	8.864805	1.497×10⁴	4.16	β⁺
832	¹¹⁰Sn	50	60	8.851727	1.495×10⁴	4.15	β⁺
833	^71mZn	30	41	9.017370	1.493×10⁴	4.15	β⁻
834	¹⁸⁴Hf	72	112	8.296871	1.483×10⁴	4.12	β⁻
835	¹⁴⁹Tb	65	84	8.551166	1.482×10⁴	4.12	β⁺(83), α (17)
836	⁴⁴Sc	21	23		1.455×10⁴	4.04	β⁺
837	²⁶²Lr	103	159	7.681556	1.44×10⁴	4	β⁺, SF
838	¹⁴¹La	57	84	8.659540	1.411×10⁴	3.92	β⁻	FP
839	¹³³La	57	76	8.714109	1.408×10⁴	3.91	β⁺
840	⁴³Sc	21	22	8.912907	1.401×10⁴	3.89	β⁺
841	¹⁹³Hg	80	113		1.368×10⁴	3.80	β⁺
842	^195mIr	77	118	8.233326	1.346×10⁴	3.74	β⁻
843	^176mLu	71	105		1.319×10⁴	3.66	β⁻, ε (0.1)
844	^202mPb	82	120		1.274×10⁴	3.54	IT (90), β⁺(9.5)
845	⁹²Y	39	53	8.993208	1.274×10⁴	3.54	β⁻	FP
846	²⁰⁴Po	84	120	8.161200	1.267×10⁴	3.52	β⁺(99), α (0.7)
847	¹³²Ce	58	74	8.696131	1.264×10⁴	3.51	β⁺
848	¹⁵⁰Tb	65	85	8.545394	1.253×10⁴	3.48	β⁺
849	^117mCd	48	69	8.808840	1.239×10⁴	3.44	β⁻	FP
850	⁶¹Cu	29	32	9.087452	1.203×10⁴	3.34	β⁺
851	²⁵⁴Fm	100	154	7.752808	1.166×10⁴	3.24	α, SF (0.06)
852	²⁰⁹Pb	82	127	8.155607	1.165×10⁴	3.24	β⁻	DP
853	^90mY	39	51		1.161×10⁴	3.23	IT, β⁻
854	²⁵⁰Bk	97	153	7.779523	1.156×10⁴	3.21	β⁻
855	¹⁶¹Er	68	93	8.476352	1.156×10⁴	3.21	β⁺
856	¹⁹¹Au	79	112	8.248343	1.145×10⁴	3.18	β⁺
857	¹⁷³Ta	73	100	8.374218	1.130×10⁴	3.14	β⁺
858	¹¹²Ag	47	65	8.844756	1.127×10⁴	3.13	β⁻
859	²⁴⁷Cf	98	149	7.803566	1.120×10⁴	3.11	β⁺, α
860	¹⁶⁷Ho	67	100	8.444304	1.116×10⁴	3.1	β⁻
861	^190mRe	75	115	8.257433	1.116×10⁴	3.1	β⁻(54), IT (46)
862	¹⁸⁴Ir	77	107	8.286599	1.112×10⁴	3.09	β⁺
863	^190m3Ir	77	113		1.111×10⁴	3.09	β⁺(91), IT (8.6)
864	⁴⁵Ti	22	23	8.938121	1.109×10⁴	3.08	β⁺
865	^134mCs	55	79		1.048×10⁴	2.91	IT, ε (0.3)
866	¹⁹⁷Tl	81	116	8.215190	1.022×10⁴	2.84	β⁺
867	³⁸S	16	22	8.778196	1.022×10⁴	2.84	β⁻
868	⁸⁸Kr	36	52	8.976918	1.017×10⁴	2.83	β⁻	FP
869	^87mSr	38	49		1.010×10⁴	2.81	IT, ε (0.3)
870	¹¹⁷Sb	51	66	8.828977	1.008×10⁴	2.80	β⁺
871	²²⁴Ac	89	135	7.980993	1.001×10⁴	2.78	β⁺(91), α (9.1)
872	⁹³Tc	43	50	8.970274	9.90×10³	2.75	β⁺
873	¹⁵⁰Pm	61	89	8.562014	9.713×10³	2.70	β⁻
874	⁸⁵Y	39	46		9.648×10³	2.68	β⁺
875	³¹Si	14	17	8.811618	9.430×10³	2.62	β⁻	CG
876	²⁵⁶Fm	100	156	7.737398	9.426×10³	2.62	SF (92), α (8.1)
877	⁹²Sr	38	54	8.972067	9.400×10³	2.61	β⁻	FP
878	⁵⁶Mn	25	31	9.087572	9.284×10³	2.58	β⁻
879	⁶⁵Ni	28	37	9.073267	9.063×10³	2.52	β⁻
880	¹¹⁷Cd	48	69		9.011×10³	2.50	β⁻	FP
881	¹⁷⁶W	74	102	8.359055	9.00×10³	2.5	β⁺
882	²³⁹Cm	96	143	7.857143	9.00×10³	2.5	β⁺, α
883	¹¹⁶Te	52	64	8.806414	8.964×10³	2.49	β⁺
884	¹⁴¹Nd	60	81	8.668476	8.964×10³	2.49	β⁺
885	¹⁶¹Ho	67	94	8.488737	8.928×10³	2.48	β⁺
886	²¹⁰Rn	86	124	8.117032	8.640×10³	2.40	α (96), β⁺(4)
887	¹⁹⁸Pb	82	116	8.202893	8.640×10³	2.4	β⁺
888	¹⁵²Dy	66	86	8.532670	8.568×10³	2.38	β⁺, α (0.1)	IM
889	⁸³Br	35	48	9.023243	8.546×10³	2.37	β⁻	FP
890	¹⁷⁸Ta	73	105	8.355075	8.496×10³	2.36	β⁺
891	¹⁸⁷Pt	78	109	8.267638	8.460×10³	2.35	β⁺
892	¹⁶⁵Dy	66	99	8.456891	8.395×10³	2.33	β⁻	IM
893	¹³²I	53	79	8.720570	8.262×10³	2.30	β⁻	FP
894	¹⁵⁸Er	68	90	8.484619	8.24×10³	2.29	β⁺
895	¹⁹⁵Ir	77	118		8.24×10³	2.29	β⁻
896	⁶⁶Ge	32	34	9.004964	8.136×10³	2.26	β⁺
897	¹²⁹Ba	56	73	8.730746	8.028×10³	2.23	β⁺
898	^250mEs	99	151		7.99×10³	2.22	β⁺
899	¹⁷⁷W	74	103	8.352118	7.94×10³	2.21	β⁺
900	²³⁸Cm	96	142	7.863764	7.92×10³	2.2	β⁺(96), α (3.8), SF
901	^106mRh	45	61	8.884761	7.86×10³	2.18	β⁻
902	^129mBa	56	73		7.686×10³	2.14	β⁺
903	^138mPr	59	79	8.671088	7.632×10³	2.12	β⁺
904	¹²¹I	53	68	8.784443	7.632×10³	2.12	β⁺
905	¹²⁷Sn	50	77	8.728800	7.560×10³	2.10	β⁻	FP
906	¹²³Xe	54	69	8.764409	7.488×10³	2.08	β⁺
907	¹⁸⁶Pt	78	108	8.274897	7.488×10³	2.08	β⁺, α
908	²⁴⁵Am	95	150	7.818674	7.380×10³	2.05	β⁻
909	⁸⁹Nb	41	48	8.977507	7.308×10³	2.03	β⁺
910	^117mIn	49	68	8.828849	6.972×10³	1.94	β⁻(53), IT (47)	FP
911	^186mIr	77	109		6.912×10³	1.92	β⁺(~75), IT (~25)
912	¹⁷⁷Yb	70	107	8.359401	6.880×10³	1.91	β⁻
913	^198mTl	81	117		6.732×10³	1.87	β⁺(56), IT (44)
914	¹⁹⁶Tl	81	115	8.211618	6.624×10³	1.84	β⁺
915	^83m2Kr	36	47		6.588×10³	1.83	IT	FP
916	¹⁸F	9	9	8.022789	6.584×10³	1.83	β⁺	CG, IM
917	⁴¹Ar	18	23	8.877852	6.577×10³	1.83	β⁻	CG
918	¹⁶³Tm	69	94	8.456205	6.516×10³	1.81	β⁺
919	²⁰⁷At	85	122	8.135303	6.516×10³	1.81	β⁺(91), α (8.6)
920	²³⁹Pa	91	148	7.848148	6.48×10³	1.8	β⁻
921	²²⁴Rn	86	138	7.971327	6.420×10³	1.78	β⁻
922	⁸⁰Sr	38	42	8.950177	6.378×10³	1.77	β⁺
923	¹⁸¹Os	76	105	8.311935	6.30×10³	1.75	β⁺
924	²⁰⁵Po	84	121	8.156737	6.264×10³	1.74	β⁺, α
925	¹⁴⁹Nd	60	89	8.570529	6.221×10³	1.73	β⁻	FP
926	²⁰²Bi	83	119	8.173966	6.19×10³	1.72	β⁺
927	²⁰¹Bi	83	118	8.177875	6.18×10³	1.72	β⁺
928	²⁴⁹Es	99	150	7.785464	6.132×10³	1.70	β⁺(99), α (0.6)
929	⁸⁷Zr	40	47	8.983373	6.048×10³	1.68	β⁺
930	¹²⁶Ba	56	70	8.727439	6.00×10³	1.67	β⁺
931	^113mIn	49	64		5.968×10³	1.66	IT
932	⁶¹Co	27	34	9.102449	5.936×10³	1.65	β⁻
933	¹⁴⁷Tb	65	82	8.552634	5.90×10³	1.64	β⁺
934	²³⁸Am	95	143	7.867882	5.880×10³	1.63	β⁺, α
935	²⁰⁸At	85	123	8.131376	5.868×10³	1.63	β⁺(99), α (0.6)
936	¹³³Ce	58	75		5.82×10³	1.62	β⁺
937	⁷⁵Br	35	40	8.993181	5.80×10³	1.61	β⁺
938	⁹⁵Ru	44	51	8.949749	5.785×10³	1.61	β⁺
939	²⁵⁹Md	101	158	7.709860	5.76×10³	1.60	SF
940	^152m5Eu	63	89		5.748×10³	1.60	IT
941	^197mPt	78	119		5.725×10³	1.59	IT (97), β⁻(3.3)
942	²³⁰Ra	88	142	7.921249	5.580×10³	1.55	β⁻
943	¹⁴²La	57	85	8.634954	5.466×10³	1.52	β⁻	FP
944	⁷⁸As	33	45	9.004879	5.442×10³	1.51	β⁻	FP
945	¹⁹⁹Pb	82	117	8.198111	5.40×10³	1.5	β⁺
946	⁷⁸Ge	32	46	8.992635	5.28×10³	1.47	β⁻	FP
947	²⁵⁵Cf	98	157	7.738739	5.10×10³	1.42	β⁻
948	^196mTl	81	115		5.076×10³	1.41	β⁺(96), IT (3.8)
949	^196mIr	77	119	8.219440	5.040×10³	1.40	β⁻
950	²⁶⁷Db	105	162	7.644361	5.04×10³	1.4^{[n 1]}	SF
951	^132mI	53	79		4.993×10³	1.39	IT (86), β⁻(14)	FP
952	¹³⁹Ba	56	83	8.682217	4.976×10³	1.38	β⁻	FP
953	⁷⁵Ge	32	43	9.029413	4.967×10³	1.38	β⁻
954	¹²⁰I	53	67	8.769577	4.900×10³	1.36	β⁺
955	²⁵⁶Md	101	155	7.729062	4.662×10³	1.30	β⁺(91), α (9.2)
956	¹³⁷Pr	59	78	8.678459	4.608×10³	1.28	β⁺
957	⁸⁷Kr	36	51	8.999022	4.578×10³	1.27	β⁻	FP
958	¹⁶⁴Yb	70	94	8.443419	4.548×10³	1.26	β⁺
959	¹⁶³Er	68	95	8.471168	4.500×10³	1.25	β⁺
960	¹⁷⁸Yb	70	108	8.350530	4.440×10³	1.23	β⁻
961	²³⁷Am	95	142	7.874830	4.416×10³	1.23	β⁺, α
962	⁷⁷Kr	36	41	8.982618	4.368×10³	1.21	β⁺
963	¹⁴²Sm	62	80	8.627616	4.349×10³	1.21	β⁺
964	⁹⁷Nb	41	56	8.953864	4.326×10³	1.20	β⁻	FP
965	¹⁸⁵Pt	78	107	8.269598	4.254×10³	1.18	β⁺
966	¹⁹⁵Tl	81	114	8.215712	4.176×10³	1.16	β⁺
967	¹²⁹Te	52	77		4.176×10³	1.16	β⁻	FP
968	¹⁰⁴Ag	47	57	8.889702	4.152×10³	1.15	β⁺
969	^110mIn	49	61		4.146×10³	1.15	β⁺
970	¹⁷⁴Ta	73	101	8.368684	4.104×10³	1.14	β⁺
971	⁶⁸Ga	31	37	9.057888	4.071×10³	1.13	β⁺	IM
972	^85mSr	38	47		4.058×10³	1.13	IT (87), β⁺(13)
973	^190mIr	77	113		4.032×10³	1.12	IT
974	^162mHo	67	95	8.478371	4.020×10³	1.12	IT (62), β⁺(38)
975	^204m2Pb	82	122		4.016×10³	1.12	IT
976	^89mNb	41	48		3.96×10³	1.10	β⁺
977	¹⁰³Ag	47	56	8.894541	3.942×10³	1.10	β⁺
978	²⁴⁹Cm	96	153	7.787191	3.849×10³	1.07	β⁻
979	²²⁹Ac	89	140	7.937048	3.762×10³	1.05	β⁻
980	¹¹⁷Te	52	65	8.798652	3.720×10³	1.03	β⁺
981	²⁴⁰Np	93	147	7.853348	3.714×10³	1.03	β⁻
982	^182mHf	72	110		3.69×10³	1.03	β⁻(54), IT (46)
983	¹⁸³Hf	72	111	8.307885	3.665×10³	1.02	β⁻
984	²¹²Bi	83	129	8.109617	3.633×10³	1.01	β⁻(64), α (36)	DP
985	^116m2Sb	51	65	8.816483	3.618×10³	1.01	β⁺
986	¹⁴⁸Tb	65	83	8.547949	3.60×10³	1.00	β⁺
987	²⁷⁰Db	105	165		3.6×10³	1.0^{[n 1]}	α (~87), SF (~13)

1 2 3 4 5 These superheavy isotopes have large statistical uncertainties in their half-lives because only a small number of atoms have been counted one at a time. They are given in their originally reported form with two significant figures, but would not deserve it by the standards applied to other isotopes. The actual uncertainty can be found through the isotope link.

Radionuclides with half-lives less than 1 hour

The following is incomplete and out of date, but is the only such list we have.

Notes

↑ Two further nuclides, plutonium-244 and samarium-146, have half-lives just long enough (8.13×10⁷ and 9.20×10⁷ years^[2]) that they could have survived from the formation of the Solar System and be present on Earth in trace quantities (having survived 56 and 50 half-lives). They might therefore be considered primordial, but fall short of the detection threshold in studies so far.^{[ citation needed ]}
↑ Two isotopes marked as such, ¹³⁴Cs and ¹⁵⁴Eu, are not directly produced by fission but arise in nuclear reactors by neutron capture on isotopes that are. They are included as they are mentioned elsewhere on Wikipedia as being produced by fission.
1 2 3 4 5 6 Note that NUBASE2020 uses the tropical year to convert between years and other units of time, not the Gregorian year. The relationship between years and other time units in NUBASE2020 is as follows: 1 y = 365.2422 d = 31 556 926 s

References

↑ Thoennessen, M. (2 April 2019). "Discovery of Nuclides Project" . Retrieved 26 April 2019.
1 2 Chiera, Nadine M.; Sprung, Peter; Amelin, Yuri; Dressler, Rugard; Schumann, Dorothea; Talip, Zeynep (1 August 2024). "The ¹⁴⁶Sm half-life re-measured: consolidating the chronometer for events in the early Solar System". Scientific Reports. 14 (1): 17436. doi: 10.1038/s41598-024-64104-6 . PMC 11294585 . PMID 39090187.
↑ Merrill, Paul W. (September 1954). "17. Technetium in S-type stars". Transactions of the International Astronomical Union. 8: 832–833.
↑ Primarily sourced from and . (accessed 2025-07-18)
↑ Yan, X.; Cheng, Z.; Abdukerim, A.; et al. (2024). "Searching for two-neutrino and neutrinoless double beta decay of ¹³⁴Xe with the PandaX-4T experiment". Physical Review Letters. 132 (152502): 152502. arXiv: 2312.15632 . Bibcode:2024PhRvL.132o2502Y. doi:10.1103/PhysRevLett.132.152502. PMID 38682998.
↑ Akerib, D S; et al. (2020-10-01). "Search for two neutrino double electron capture of ¹²⁴Xe and ¹²⁶Xe in the full exposure of the LUX detector". Journal of Physics G: Nuclear and Particle Physics. 47 (10): 105105. arXiv: 1912.02742 . Bibcode:2020JPhG...47j5105A. doi:10.1088/1361-6471/ab9c2d. ISSN 0954-3899.
↑ Belli, P.; Bernabei, R.; Cappella, F.; Cerulli, R.; Danevich, F. A.; d’Angelo, S.; Incicchitti, A.; Kovtun, G. P.; Kovtun, N. G.; Laubenstein, M.; Poda, D. V.; Polischuk, O. G.; Shcherban, A. P.; Solopikhin, D. A.; Suhonen, J.; Tretyak, V. I. (2013-03-06). "Search for 2 β decays of 96 Ru and 104 Ru by ultralow-background HPGe γ spectrometry at LNGS: Final results". Physical Review C. 87 (3): 034607. arXiv: 1302.7134 . doi:10.1103/PhysRevC.87.034607. ISSN 0556-2813.
↑ Bikit, I.; Krmar, M.; Slivka, J.; Vesković, M.; Čonkić, Lj.; Aničin, I. (1998-10-01). "New results on the double β decay of iron". Physical Review C. 58 (4): 2566–2567. Bibcode:1998PhRvC..58.2566B. doi:10.1103/PhysRevC.58.2566. ISSN 0556-2813.
↑ Beeman, J. W.; Bellini, F.; Cardani, L.; Casali, N.; Di Domizio, S.; Fiorini, E.; Gironi, L.; Nagorny, S. S.; Nisi, S.; Orio, F.; Pattavina, L.; Pessina, G.; Piperno, G.; Pirro, S.; Previtali, E.; Rusconi, C.; Tomei, C.; Vignati, M. (2013). "New experimental limits on the α decays of lead isotopes". The European Physical Journal A. 49 (4): 50. arXiv: 1212.2422 . Bibcode:2013EPJA...49...50B. doi:10.1140/epja/i2013-13050-7. ISSN 1434-6001.
↑ Barabash, A. S.; Hubert, Ph.; Marquet, Ch.; Nachab, A.; Konovalov, S. I.; Perrot, F.; Piquemal, F.; Umatov, V. (2011-04-21). "Improved limits on β⁺ EC and ECEC processes in ¹¹²Sn". Physical Review C. 83 (4): 045503. doi:10.1103/PhysRevC.83.045503. ISSN 0556-2813.
↑ Danevich, F. A.; Hult, M.; Junghans, A.; Kasperovych, D. V.; Kropivyansky, B. N.; Lutter, G.; Marissens, G.; Polischuk, O. G.; Romaniuk, M. V.; Stroh, H.; Tessalina, S.; Tretyak, V. I.; Ware, B. (2022). "New limits on double-beta decay of ¹⁹⁰Pt and ¹⁹⁸Pt". The European Physical Journal C. 82 (1). arXiv: 2201.06555 . doi:10.1140/epjc/s10052-022-09989-1. ISSN 1434-6044.
↑ Belli, P.; Bernabei, R.; Boiko, R. S.; Cappella, F.; Caracciolo, V.; Cerulli, R.; Danevich, F. A.; Di Marco, A.; Incicchitti, A.; Kropivyansky, B. N.; Laubenstein, M.; Nisi, S.; Poda, D. V.; Polischuk, O. G.; Tretyak, V. I. (2019). "First direct search for 2ϵ and ϵβ⁺ of ¹⁴⁴Sm and 2β⁻ decay of ¹⁵⁴Sm". The European Physical Journal A. 55 (11). arXiv: 1910.02262 . doi:10.1140/epja/i2019-12911-3. ISSN 1434-6001.
1 2 3 4 Belli, P.; Bernabei, R.; Cappella, F.; Caracciolo, V.; Cerulli, R.; Danevich, F. A.; Incicchitti, A.; Kasperovych, D. V.; Kobychev, V. V.; Kovtun, G. P.; Kovtun, N. G.; Laubenstein, M.; Poda, D. V.; Polischuk, O. G.; Shcherban, A. P.; Tessalina, S.; Tretyak, V. I. (2020-08-05). "Search for α decay of naturally occurring osmium nuclides accompanied by γ quanta". Physical Review C. 102 (2): 024605. arXiv: 2009.01508 . Bibcode:2020PhRvC.102b4605B. doi:10.1103/PhysRevC.102.024605. ISSN 2469-9985.
↑ Belli, P; Bernabei, R; Cappella, F; Cerulli, R; Danevich, F A; d'Angelo, S; Incicchitti, A; Kobychev, V V; Poda, D V; Tretyak, V I (2011-11-01). "Final results of an experiment to search for 2β processes in zinc and tungsten with the help of radiopure ZnWO₄ crystal scintillators". Journal of Physics G: Nuclear and Particle Physics. 38 (11): 115107. arXiv: 1110.3923 . Bibcode:2011JPhG...38k5107B. doi:10.1088/0954-3899/38/11/115107. ISSN 0954-3899.
↑ Lehnert, B; Wester, T; Degering, D; Sommer, D; Wagner, L; Zuber, K (2016-08-01). "Double electron capture searches in ⁷⁴Se". Journal of Physics G: Nuclear and Particle Physics. 43 (8): 085201. arXiv: 1605.05976 . Bibcode:2016JPhG...43h5201L. doi:10.1088/0954-3899/43/8/085201. ISSN 0954-3899.
1 2 3 4 5 Broerman, B.; Laubenstein, M.; Nagorny, S.; Song, N.; Vincent, A.C. (2021). "A search for rare and induced nuclear decays in hafnium". Nuclear Physics A. 1012: 122212. arXiv: 2012.08339 . Bibcode:2021NuPhA101222212B. doi:10.1016/j.nuclphysa.2021.122212.
1 2 3 4 5 Belli, P.; Bernabei, R.; Cappella, F.; Cerulli, R.; Danevich, F.A.; dʼAngelo, S.; Di Vacri, M.L.; Incicchitti, A.; Laubenstein, M.; Nagorny, S.S.; Nisi, S.; Tolmachev, A.V.; Tretyak, V.I.; Yavetskiy, R.P. (2011). "First search for double β decay of dysprosium". Nuclear Physics A. 859 (1): 126–139. arXiv: 1103.5359 . Bibcode:2011NuPhA.859..126B. doi:10.1016/j.nuclphysa.2011.04.003.
1 2 Belli, P.; Bernabei, R.; Boiko, R.S.; Cappella, F.; Cerulli, R.; Danevich, F.A.; Incicchitti, A.; Kropivyansky, B.N.; Laubenstein, M.; Poda, D.V.; Polischuk, O.G.; Tretyak, V.I. (2014). "Search for double beta decay of ¹³⁶Ce and ¹³⁸Ce with HPGe gamma detector". Nuclear Physics A. 930: 195–208. arXiv: 1409.2734 . Bibcode:2014NuPhA.930..195B. doi:10.1016/j.nuclphysa.2014.08.072.
↑ Arnquist, I. J.; Avignone III, F. T.; Barabash, A. S.; Barton, C. J.; Bhimani, K. H.; Blalock, E.; Bos, B.; Busch, M.; Buuck, M.; Caldwell, T. S.; Christofferson, C. D.; Chu, P.-H.; Clark, M. L.; Cuesta, C.; Detwiler, J. A.; Efremenko, Yu.; Ejiri, H.; Elliott, S. R.; Giovanetti, G. K.; Goett, J.; Green, M. P.; Gruszko, J.; Guinn, I. S.; Guiseppe, V. E.; Haufe, C. R.; Henning, R.; Aguilar, D. Hervas; Hoppe, E. W.; Hostiuc, A.; Kim, I.; Kouzes, R. T.; Lannen V., T. E.; Li, A.; López-Castaño, J. M.; Massarczyk, R.; Meijer, S. J.; Meijer, W.; Oli, T. K.; Paudel, L. S.; Pettus, W.; Poon, A. W. P.; Radford, D. C.; Reine, A. L.; Rielage, K.; Rouyer, A.; Ruof, N. W.; Schaper, D. C.; Schleich, S. J.; Smith-Gandy, T. A.; Tedeschi, D.; Thompson, J. D.; Varner, R. L.; Vasilyev, S.; Watkins, S. L.; Wilkerson, J. F.; Wiseman, C.; Xu, W.; Yu, C.-H. (13 October 2023). "Constraints on the Decay of ^180mTa". Phys. Rev. Lett. 131 (15): 152501. arXiv: 2306.01965 . doi:10.1103/PhysRevLett.131.152501. PMID 37897780.
↑ Belli, P.; Bernabei, R.; Dai, C.J.; Grianti, F.; He, H.L.; Ignesti, G.; Incicchitti, A.; Kuang, H.H.; Ma, J.M.; Montecchia, F.; Ponkratenko, O.A.; Prosperi, D.; Tretyak, V.I.; Zdesenko, Yu.G. (1999). "New limits on spin-dependent coupled WIMPs and on 2β processes in ⁴⁰Ca and ⁴⁶Ca by using low radioactive CaF₂(Eu) crystal scintillators". Nuclear Physics B. 563 (1–2): 97–106. Bibcode:1999NuPhB.563...97B. doi:10.1016/S0550-3213(99)00618-5.
↑ A. Alessandrello; et al. (January 2003). "New Limits on Naturally Occurring Electron Capture of ¹²³Te". Physical Review C. 67 (1): 014323. arXiv: hep-ex/0211015 . Bibcode:2003PhRvC..67a4323A. doi:10.1103/PhysRevC.67.014323. S2CID 119523039.
↑ Aprile, E.; Abe, K.; Agostini, F.; et al. (26 August 2022). "Double-weak decays of Xe 124 and Xe 136 in the XENON1T and XENONnT experiments". Physical Review C. 106 (2). doi:10.1103/PhysRevC.106.024328.
↑ Meshik, A.P.; Hohenberg, C.M.; Pravdivtseva, O.V.; Kapusta, Y.S. (2001). "Weak decay of ¹³⁰Ba and ¹³²Ba: Geochemical measurements". Physical Review C. 64 (3): 035205–1–035205–6. Bibcode:2001PhRvC..64c5205M. doi:10.1103/PhysRevC.64.035205.
↑ M. Pujol; B. Marty; P. Burnard; P. Philippot (2009). "Xenon in Archean barite: Weak decay of ¹³⁰Ba, mass-dependent isotopic fractionation and implication for barite formation". Geochimica et Cosmochimica Acta . 73 (22): 6834–6846. Bibcode:2009GeCoA..73.6834P. doi:10.1016/j.gca.2009.08.002.
↑ Münster, A.; Sivers, M. v.; Angloher, G.; Bento, A.; Bucci, C.; Canonica, L.; Erb, A.; Feilitzsch, F. v.; Gorla, P.; Gütlein, A.; Hauff, D.; Jochum, J.; Kraus, H.; Lanfranchi, J. -C.; Laubenstein, M.; Loebell, J.; Ortigoza, Y.; Petricca, F.; Potzel, W.; Pröbst, F.; Puimedon, J.; Reindl, F.; Roth, S.; Rottler, K.; Sailer, C.; Schäffner, K.; Schieck, J.; Scholl, S.; Schönert, S.; Seidel, W.; Stodolsky, L.; Strandhagen, C.; Strauss, R.; Tanzke, A.; Uffinger, M.; Ulrich, A.; Usherov, I.; Wawoczny, S.; Willers, M.; Wüstrich, M.; Zöller, A. (May 2014). "Radiopurity of CaWO₄ crystals for direct dark matter search with CRESST and EURECA". Journal of Cosmology and Astroparticle Physics (5): 018. arXiv: 1403.5114 . Bibcode:2014JCAP...05..018M. doi:10.1088/1475-7516/2014/05/018. 018.
↑ Belli, P.; Bernabei, R.; Cappella, F.; Caracciolo, V.; Cerulli, R.; Incicchitti, A.; Laubenstein, M.; Leoncini, A.; Merlo, V.; Nagorny, S.S.; Nahorna, V.V.; Nisi, S.; Wang, P. (January 2025). "A new measurement of 174Hf alpha decay". Nuclear Physics A. 1053: 122976. doi:10.1016/j.nuclphysa.2024.122976.
↑ Nozzoli, Francesco; Ghezzer, Luigi Ernesto; Nicolaidis, Riccardo; Iuppa, Roberto; Zuccon, Paolo; et al. (European Nuclear Physics Conference (EuNPC 2022)) (8 December 2023). "Investigation of Electron Capture in ¹⁷⁶Lu with a LYSO crystal scintillator". EPJ Web of Conf. 290 (1002): 01002. arXiv: 2211.15203 . Bibcode:2023EPJWC.29001002N. doi:10.1051/epjconf/202329001002.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 Davis, Andrew M. (2022). "Short-Lived Nuclides in the Early Solar System: Abundances, Origins, and Applications". Annual Review of Nuclear and Particle Science. 72: 339–363. Bibcode:2022ARNPS..72..339D. doi: 10.1146/annurev-nucl-010722-074615 .
↑ Wallner, A.; Faestermann, T.; Feige, J.; Feldstein, C.; Knie, K.; Korschinek, G.; Kutschera, W.; Ofan, A.; Paul, M.; Quinto, F.; Rugel, G.; Steier, P. (2015). "Abundance of live 244Pu in deep-sea reservoirs on Earth points to rarity of actinide nucleosynthesis". Nature Communications. 6: 5956. arXiv: 1509.08054 . Bibcode:2015NatCo...6.5956W. doi:10.1038/ncomms6956. ISSN 2041-1723. PMC 4309418 . PMID 25601158.
1 2 Clayton, Donald D.; Morgan, John A. (1977). "Muon production of ^92,94Nb in the Earth's crust". Nature. 266 (5604): 712–713. doi:10.1038/266712a0. S2CID 4292459.
↑ Cosmogenic Iron-60 In Iron Meteorites: Measurements By Low-Level Counting.
↑ Interstellar ⁶⁰Fe detected on Earth - but where is the r-process nuclide ²⁴⁴Pu?
↑ Chiera, Nadine Mariel; Dressler, Rugard; Sprung, Peter; Talip, Zeynep; Schumann, Dorothea (2022-05-28). "High precision half-life measurement of the extinct radio-lanthanide Dysprosium-154". Scientific Reports. 12 (1). Springer Science and Business Media LLC: 8988. Bibcode:2022NatSR..12.8988C. doi: 10.1038/s41598-022-12684-6 . ISSN 2045-2322. PMC 9148308 . PMID 35643721.
↑ "Adopted Levels for ²⁵⁰Cm" (PDF). NNDC Chart of Nuclides.
↑ Kajan, I.; Heinitz, S.; Kossert, K.; Sprung, P.; Dressler, R.; Schumann, D. (2021-10-05). "First direct determination of the ⁹³Mo half-life". Scientific Reports. 11 (1): 19788. Bibcode:2021NatSR..1119788K. doi:10.1038/s41598-021-99253-5. ISSN 2045-2322. PMC 8492754 . PMID 34611245.
↑ Chiera, Nadine M.; Dressler, Rugard; Sprung, Peter; Talip, Zeynep; Schumann, Dorothea (2023). "Determination of the half-life of gadolinium-148". Applied Radiation and Isotopes. 194. Elsevier BV: 110708. Bibcode:2023AppRI.19410708C. doi: 10.1016/j.apradiso.2023.110708 . ISSN 0969-8043. PMID 36731388.
↑ Kmak, K. N.; Neupane, S.; Kolos, K.; et al. (2025). "Measurement of the ¹⁷⁵Hf half-life". Physical Review C. 111 (024308). doi:10.1103/PhysRevC.111.024308.
↑ Liang, C. F.; Paris, P.; Sheline, R. K. (2000-09-19). "α decay of ²²⁵Ra". Physical Review C. 62 (4). American Physical Society (APS): 047303. Bibcode:2000PhRvC..62d7303L. doi:10.1103/physrevc.62.047303. ISSN 0556-2813.
↑ Half-life determination of 155Tb from mass-separated samples produced at CERN-MEDICIS
↑ Collins, S.M.; Köster, U.; Robinson, A.P.; Ivanov, P.; Cocolios, T.E.; Russell, B.; Fenwick, A.J.; Bernerd, C.; Stegemann, S.; Johnston, K.; Gerami, A.M.; Chrysalidis, K.; Mohamud, H.; Ramirez, N.; Bhaisare, A.; Mewburn-Crook, J.; Cullen, D.M.; Pietras, B.; Pells, S.; Dockx, K.; Stucki, N.; Regan, P.H. (2023). "Determination of the Terbium-152 half-life from mass-separated samples from CERN-ISOLDE and assessment of the radionuclide purity". Applied Radiation and Isotopes. 202. Elsevier BV: 111044. doi: 10.1016/j.apradiso.2023.111044 . ISSN 0969-8043. PMID 37797447.
1 2 "SHE Factory first experiment – FLEROV LABORATORY of NUCLEAR REACTIONS".
↑ Jagdish K. Tuli, Nuclear Wallet Cards, 7th edition, April 2005, Brookhaven National Laboratory, US National Nuclear Data Center
↑ Interactive chart of nuclides (Brookhaven National Laboratory)

External links

National Nuclear Data Center, Brookhaven National Laboratory
- The 2016 Atomic Mass Evaluation, AMDC
Karlsruhe Nuclide Chart, 9th edition, 2015, Joseph Magill, Gerda Pfennig, Raymond Dreher, Zsolt Sóti
National Isotope Development Center Reference information on isotopes, and coordination and management of isotope production, availability, and distribution
Isotope Development & Production for Research and Applications (IDPRA) U.S. Department of Energy program for isotope production and production research and development
- Accelerator Systems and Stable Isotopes Group at ORNL
Atomic Weights and Isotopic Compositions for All Elements U.S. National Institute of Standards and Technology
Table of nuclides (compact, with energy per baryon) Overview picture for energy of nuclides

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[21] Nubase value, for alpha decay only. Double electron capture limited only to 6.1×10¹⁴ (ground state) by ^[17]

[29] The two experimental values^[23]^[24] are discordant, with a total range of (0.5–2.7)×10²¹ years; the value in the table is a rough average.

[31] Also theoretically capable of β⁻ decay

[34] Theoretically capable of electron capture^[27]

[42] Only SF has been observed with a half-life 11,300 years; the value given theoretically estimates alpha- and beta-decay branches, which is quite uncertain.^[34]

[44] Nubase value. However, a recent direct study: P. Adhikari; et al. (2025). "Direct Measurement of the Half-Life of ³⁹Ar from 3.4 Years of Data with the DEAP-3600 Detector". The European Physical Journal C . 85 (7): 728. doi:10.1140/epjc/s10052-025-14289-5. found 302 years, a statistically significant discrepancy to be explained.

[SH-50] 1 2 3 4 5 These superheavy isotopes have large statistical uncertainties in their half-lives because only a small number of atoms have been counted one at a time. They are given in their originally reported form with two significant figures, but would not deserve it by the standards applied to other isotopes. The actual uncertainty can be found through the isotope link.

[3] Two further nuclides, plutonium-244 and samarium-146, have half-lives just long enough (8.13×10⁷ and 9.20×10⁷ years^[2]) that they could have survived from the formation of the Solar System and be present on Earth in trace quantities (having survived 56 and 50 half-lives). They might therefore be considered primordial, but fall short of the detection threshold in studies so far.^{[ citation needed ]}

[5] Two isotopes marked as such, ¹³⁴Cs and ¹⁵⁴Eu, are not directly produced by fission but arise in nuclear reactors by neutron capture on isotopes that are. They are included as they are mentioned elsewhere on Wikipedia as being produced by fission.

[tropical-7] 1 2 3 4 5 6 Note that NUBASE2020 uses the tropical year to convert between years and other units of time, not the Gregorian year. The relationship between years and other time units in NUBASE2020 is as follows: 1 y = 365.2422 d = 31 556 926 s

[disc-1] Thoennessen, M. (2 April 2019). "Discovery of Nuclides Project" . Retrieved 26 April 2019.

[Chiera2024-2] 1 2 Chiera, Nadine M.; Sprung, Peter; Amelin, Yuri; Dressler, Rugard; Schumann, Dorothea; Talip, Zeynep (1 August 2024). "The ¹⁴⁶Sm half-life re-measured: consolidating the chronometer for events in the early Solar System". Scientific Reports. 14 (1): 17436. doi: 10.1038/s41598-024-64104-6 . PMC 11294585 . PMID 39090187.

[4] Merrill, Paul W. (September 1954). "17. Technetium in S-type stars". Transactions of the International Astronomical Union. 8: 832–833.

[6] Primarily sourced from and . (accessed 2025-07-18)

[134Xe2024-8] Yan, X.; Cheng, Z.; Abdukerim, A.; et al. (2024). "Searching for two-neutrino and neutrinoless double beta decay of ¹³⁴Xe with the PandaX-4T experiment". Physical Review Letters. 132 (152502): 152502. arXiv: 2312.15632 . Bibcode:2024PhRvL.132o2502Y. doi:10.1103/PhysRevLett.132.152502. PMID 38682998.

[9] Akerib, D S; et al. (2020-10-01). "Search for two neutrino double electron capture of ¹²⁴Xe and ¹²⁶Xe in the full exposure of the LUX detector". Journal of Physics G: Nuclear and Particle Physics. 47 (10): 105105. arXiv: 1912.02742 . Bibcode:2020JPhG...47j5105A. doi:10.1088/1361-6471/ab9c2d. ISSN 0954-3899.

[10] Belli, P.; Bernabei, R.; Cappella, F.; Cerulli, R.; Danevich, F. A.; d’Angelo, S.; Incicchitti, A.; Kovtun, G. P.; Kovtun, N. G.; Laubenstein, M.; Poda, D. V.; Polischuk, O. G.; Shcherban, A. P.; Solopikhin, D. A.; Suhonen, J.; Tretyak, V. I. (2013-03-06). "Search for 2 β decays of 96 Ru and 104 Ru by ultralow-background HPGe γ spectrometry at LNGS: Final results". Physical Review C. 87 (3): 034607. arXiv: 1302.7134 . doi:10.1103/PhysRevC.87.034607. ISSN 0556-2813.

[11] Bikit, I.; Krmar, M.; Slivka, J.; Vesković, M.; Čonkić, Lj.; Aničin, I. (1998-10-01). "New results on the double β decay of iron". Physical Review C. 58 (4): 2566–2567. Bibcode:1998PhRvC..58.2566B. doi:10.1103/PhysRevC.58.2566. ISSN 0556-2813.

[12] Beeman, J. W.; Bellini, F.; Cardani, L.; Casali, N.; Di Domizio, S.; Fiorini, E.; Gironi, L.; Nagorny, S. S.; Nisi, S.; Orio, F.; Pattavina, L.; Pessina, G.; Piperno, G.; Pirro, S.; Previtali, E.; Rusconi, C.; Tomei, C.; Vignati, M. (2013). "New experimental limits on the α decays of lead isotopes". The European Physical Journal A. 49 (4): 50. arXiv: 1212.2422 . Bibcode:2013EPJA...49...50B. doi:10.1140/epja/i2013-13050-7. ISSN 1434-6001.

[13] Barabash, A. S.; Hubert, Ph.; Marquet, Ch.; Nachab, A.; Konovalov, S. I.; Perrot, F.; Piquemal, F.; Umatov, V. (2011-04-21). "Improved limits on β⁺ EC and ECEC processes in ¹¹²Sn". Physical Review C. 83 (4): 045503. doi:10.1103/PhysRevC.83.045503. ISSN 0556-2813.

[14] Danevich, F. A.; Hult, M.; Junghans, A.; Kasperovych, D. V.; Kropivyansky, B. N.; Lutter, G.; Marissens, G.; Polischuk, O. G.; Romaniuk, M. V.; Stroh, H.; Tessalina, S.; Tretyak, V. I.; Ware, B. (2022). "New limits on double-beta decay of ¹⁹⁰Pt and ¹⁹⁸Pt". The European Physical Journal C. 82 (1). arXiv: 2201.06555 . doi:10.1140/epjc/s10052-022-09989-1. ISSN 1434-6044.

[15] Belli, P.; Bernabei, R.; Boiko, R. S.; Cappella, F.; Caracciolo, V.; Cerulli, R.; Danevich, F. A.; Di Marco, A.; Incicchitti, A.; Kropivyansky, B. N.; Laubenstein, M.; Nisi, S.; Poda, D. V.; Polischuk, O. G.; Tretyak, V. I. (2019). "First direct search for 2ϵ and ϵβ⁺ of ¹⁴⁴Sm and 2β⁻ decay of ¹⁵⁴Sm". The European Physical Journal A. 55 (11). arXiv: 1910.02262 . doi:10.1140/epja/i2019-12911-3. ISSN 1434-6001.

[osmium-16] 1 2 3 4 Belli, P.; Bernabei, R.; Cappella, F.; Caracciolo, V.; Cerulli, R.; Danevich, F. A.; Incicchitti, A.; Kasperovych, D. V.; Kobychev, V. V.; Kovtun, G. P.; Kovtun, N. G.; Laubenstein, M.; Poda, D. V.; Polischuk, O. G.; Shcherban, A. P.; Tessalina, S.; Tretyak, V. I. (2020-08-05). "Search for α decay of naturally occurring osmium nuclides accompanied by γ quanta". Physical Review C. 102 (2): 024605. arXiv: 2009.01508 . Bibcode:2020PhRvC.102b4605B. doi:10.1103/PhysRevC.102.024605. ISSN 2469-9985.

[17] Belli, P; Bernabei, R; Cappella, F; Cerulli, R; Danevich, F A; d'Angelo, S; Incicchitti, A; Kobychev, V V; Poda, D V; Tretyak, V I (2011-11-01). "Final results of an experiment to search for 2β processes in zinc and tungsten with the help of radiopure ZnWO₄ crystal scintillators". Journal of Physics G: Nuclear and Particle Physics. 38 (11): 115107. arXiv: 1110.3923 . Bibcode:2011JPhG...38k5107B. doi:10.1088/0954-3899/38/11/115107. ISSN 0954-3899.

[18] Lehnert, B; Wester, T; Degering, D; Sommer, D; Wagner, L; Zuber, K (2016-08-01). "Double electron capture searches in ⁷⁴Se". Journal of Physics G: Nuclear and Particle Physics. 43 (8): 085201. arXiv: 1605.05976 . Bibcode:2016JPhG...43h5201L. doi:10.1088/0954-3899/43/8/085201. ISSN 0954-3899.

[hafnium-19] 1 2 3 4 5 Broerman, B.; Laubenstein, M.; Nagorny, S.; Song, N.; Vincent, A.C. (2021). "A search for rare and induced nuclear decays in hafnium". Nuclear Physics A. 1012: 122212. arXiv: 2012.08339 . Bibcode:2021NuPhA101222212B. doi:10.1016/j.nuclphysa.2021.122212.

[dysprosium-20] 1 2 3 4 5 Belli, P.; Bernabei, R.; Cappella, F.; Cerulli, R.; Danevich, F.A.; dʼAngelo, S.; Di Vacri, M.L.; Incicchitti, A.; Laubenstein, M.; Nagorny, S.S.; Nisi, S.; Tolmachev, A.V.; Tretyak, V.I.; Yavetskiy, R.P. (2011). "First search for double β decay of dysprosium". Nuclear Physics A. 859 (1): 126–139. arXiv: 1103.5359 . Bibcode:2011NuPhA.859..126B. doi:10.1016/j.nuclphysa.2011.04.003.

[cerium-22] 1 2 Belli, P.; Bernabei, R.; Boiko, R.S.; Cappella, F.; Cerulli, R.; Danevich, F.A.; Incicchitti, A.; Kropivyansky, B.N.; Laubenstein, M.; Poda, D.V.; Polischuk, O.G.; Tretyak, V.I. (2014). "Search for double beta decay of ¹³⁶Ce and ¹³⁸Ce with HPGe gamma detector". Nuclear Physics A. 930: 195–208. arXiv: 1409.2734 . Bibcode:2014NuPhA.930..195B. doi:10.1016/j.nuclphysa.2014.08.072.

[180mTa_2023-23] Arnquist, I. J.; Avignone III, F. T.; Barabash, A. S.; Barton, C. J.; Bhimani, K. H.; Blalock, E.; Bos, B.; Busch, M.; Buuck, M.; Caldwell, T. S.; Christofferson, C. D.; Chu, P.-H.; Clark, M. L.; Cuesta, C.; Detwiler, J. A.; Efremenko, Yu.; Ejiri, H.; Elliott, S. R.; Giovanetti, G. K.; Goett, J.; Green, M. P.; Gruszko, J.; Guinn, I. S.; Guiseppe, V. E.; Haufe, C. R.; Henning, R.; Aguilar, D. Hervas; Hoppe, E. W.; Hostiuc, A.; Kim, I.; Kouzes, R. T.; Lannen V., T. E.; Li, A.; López-Castaño, J. M.; Massarczyk, R.; Meijer, S. J.; Meijer, W.; Oli, T. K.; Paudel, L. S.; Pettus, W.; Poon, A. W. P.; Radford, D. C.; Reine, A. L.; Rielage, K.; Rouyer, A.; Ruof, N. W.; Schaper, D. C.; Schleich, S. J.; Smith-Gandy, T. A.; Tedeschi, D.; Thompson, J. D.; Varner, R. L.; Vasilyev, S.; Watkins, S. L.; Wilkerson, J. F.; Wiseman, C.; Xu, W.; Yu, C.-H. (13 October 2023). "Constraints on the Decay of ^180mTa". Phys. Rev. Lett. 131 (15): 152501. arXiv: 2306.01965 . doi:10.1103/PhysRevLett.131.152501. PMID 37897780.

[24] Belli, P.; Bernabei, R.; Dai, C.J.; Grianti, F.; He, H.L.; Ignesti, G.; Incicchitti, A.; Kuang, H.H.; Ma, J.M.; Montecchia, F.; Ponkratenko, O.A.; Prosperi, D.; Tretyak, V.I.; Zdesenko, Yu.G. (1999). "New limits on spin-dependent coupled WIMPs and on 2β processes in ⁴⁰Ca and ⁴⁶Ca by using low radioactive CaF₂(Eu) crystal scintillators". Nuclear Physics B. 563 (1–2): 97–106. Bibcode:1999NuPhB.563...97B. doi:10.1016/S0550-3213(99)00618-5.

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[39] Interstellar ⁶⁰Fe detected on Earth - but where is the r-process nuclide ²⁴⁴Pu?

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[48] Half-life determination of 155Tb from mass-separated samples produced at CERN-MEDICIS

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[264Lr-51] 1 2 "SHE Factory first experiment – FLEROV LABORATORY of NUCLEAR REACTIONS".

[52] Jagdish K. Tuli, Nuclear Wallet Cards, 7th edition, April 2005, Brookhaven National Laboratory, US National Nuclear Data Center

[53] Interactive chart of nuclides (Brookhaven National Laboratory)

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v t e Charts of nuclides
Representations	List of nuclides, Table of nuclides segmented, wide segmented, narrow
Images	Nuclide map (segmented), Nuclide map (complete), Table of isotopes
Articles on isotopes of an element	Isotope index by periodic table
Various tables and lists of the nuclides