List of nuclides

For a graphical depiction, see table of nuclides.

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). More than 5,000 nuclides have been experimentally characterized, including isomers, of which this page presently includes 987.

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, ^[2] 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), that is of the mass defect with respect to the neutron, in MeV. Use of the neutron as reference guarantees all nuclides will have a positive value. Mathematically: m_n − m_nuclide / A. Note that this means that a higher "energy" value actually means that the nuclide has a lower energy. Inversely the mass is A (m_n − E / k) where E is the energy, m_n is 1.0086649159 and k = 931.4941037 MeV (energy equivalent of the dalton). Omitted if there is no experimental mass determination within 0.0001.

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 the tables) are neglected as they should never be observed for these nuclides. Those 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 decay energy for each given decay mode (skipping SF), in respective order. Decay energies are the whole energy difference to the ground state of the product, and so include energy lost to neutrinos. Further decays in a decay chain are not included.

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. ^[3]

---

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

The tables are based now on the standard reference NUBASE2020 ^[4] and its companion, based on the same data, AME2020 ^[5] . All observational data not otherwise cited should be found in those sources, or calculated from them, and only observed data, not theoretical extrapolations, should be present in these tables.

Theoretically stable nuclides

Main article: Stable nuclide

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

No.	Nuclide	A	Z	N	Energy (MeV)
1	56Fe	56	26	30	9.153589
2	62Ni	62	28	34	9.147873
3	60Ni	60	28	32	9.145871
4	58Fe	58	26	32	9.142961
5	52Cr	52	24	28	9.137078
6	57Fe	57	26	31	9.127143
7	59Co	59	27	32	9.126060
8	54Cr	54	24	30	9.125677
9	61Ni	61	28	33	9.124138
10	55Mn	55	25	30	9.120637
11	64Ni	64	28	36	9.119740
12	66Zn	66	30	36	9.11525
13	53Cr	53	24	29	9.114481
14	63Cu	63	29	34	9.112269
15	65Cu	65	29	36	9.106144
16	68Zn	68	30	38	9.10084
17	50Ti	50	22	28	9.099956
18	51V	51	23	28	9.094908
19	67Zn	67	30	37	9.08446
20	48Ti	48	22	26	9.081588
21	72Ge	72	32	40	9.079456
22	70Ge	70	32	38	9.07935
23	69Ga	69	31	38	9.07607
24	88Sr	88	38	50	9.070428
25	74Ge	74	32	42	9.063513
26	49Ti	49	22	27	9.062420
27	76Se	76	34	42	9.061475
28	71Ga	71	31	40	9.05919
29	78Se	78	34	44	9.058830
30	90Zr	90	40	50	9.057680
31	89Y	89	39	50	9.056837
32	86Sr	86	38	48	9.054145
33	82Kr	82	36	46	9.054145
34	84Kr	84	36	48	9.052739
35	73Ge	73	32	41	9.047997
36	87Sr	87	38	49	9.046951
37	75As	75	33	42	9.04511
38	80Kr	80	36	44	9.044987
39	77Se	77	34	43	9.040143
40	85Rb	85	37	48	9.037993
41	91Zr	91	40	51	9.037204
42	83Kr	83	36	47	9.035061
43	79Br	79	35	44	9.03421
44	81Br	81	35	46	9.03400
45	92Zr	92	40	52	9.032829
46	46Ti	46	22	24	9.030628
47	47Ti	47	22	25	9.027437
48	44Ca	44	20	24	9.013789
49	94Mo	94	42	52	9.011893
50	93Nb	93	41	52	9.00909
51	96Mo	96	42	54	8.996265
52	95Mo	95	42	53	8.994601
53	42Ca	42	20	22	8.989111
54	38Ar	38	18	20	8.984866
55	45Sc	45	21	24	8.98404
56	97Mo	97	42	55	8.973841
57	98Ru	98	44	54	8.97157
58	43Ca	43	20	23	8.964548
59	100Ru	100	44	56	8.963592
60	99Ru	99	44	55	8.956423
61	34S	34	16	18	8.951662
62	40Ar	40	18	22	8.947316
63	102Ru	102	44	58	8.944910
64	101Ru	101	44	57	8.942190
65	41K	41	19	22	8.938624
66	39K	39	19	20	8.938169
67	104Pd	104	46	58	8.93089
68	37Cl	37	17	20	8.929738
69	103Rh	103	45	58	8.92599
70	36S	36	16	20	8.923100
71	106Pd	106	46	60	8.91950
72	105Pd	105	46	59	8.91339
73	35Cl	35	17	18	8.900276
74	108Pd	108	46	62	8.90025
75	107Ag	107	47	60	8.89755
76	110Cd	110	48	62	8.892664
77	30Si	30	14	16	8.885750
78	109Ag	109	47	62	8.88526
79	32S	32	16	16	8.884304
80	33S	33	16	17	8.876950
81	31P	31	15	16	8.859723
82	28Si	28	14	14	8.838918
83	29Si	29	14	15	8.826321
84	112Cd	112	48	64	8.880022
85	111Cd	111	48	63	8.875392
86	114Sn	114	50	64	8.865702
87	113In	113	49	64	8.862178
88	116Sn	116	50	66	8.860335
89	115Sn	115	50	65	8.854221
90	118Sn	118	50	68	8.848037
91	117Sn	117	50	67	8.843948
92	120Sn	120	50	70	8.830466
93	119Sn	119	50	69	8.828167
94	121Sb	121	51	70	8.81181
95	122Te	122	52	70	8.81159
96	124Te	124	52	72	8.80135
97	123Sb	123	51	72	8.79671
98	126Te	126	52	74	8.78611
99	125Te	125	52	73	8.78349
100	128Xe	128	54	74	8.773354
101	127I	127	53	74	8.77197
102	130Xe	130	54	76	8.762706
103	129Xe	129	54	75	8.758885
104	132Xe	132	54	78	8.747674
105	131Xe	131	54	77	8.746231
106	134Ba	134	56	78	8.735124
107	133Cs	133	55	78	8.733506
108	136Ba	136	56	80	8.724900
109	135Ba	135	56	79	8.722064
110	137Ba	137	56	81	8.711620
111	138Ba	138	56	82	8.710896
112	27Al	27	13	14	8.708239
113	140Ce	140	58	82	8.700420
114	139La	139	57	82	8.698817
115	26Mg	26	12	14	8.694954
116	141Pr	141	59	82	8.68135
117	142Nd	142	60	82	8.676600
118	24Mg	24	12	12	8.651884
119	25Mg	25	12	13	8.599029
120	156Gd	156	64	92	8.536288
121	157Gd	157	64	93	8.522426
122	158Gd	158	64	94	8.518723
123	159Tb	159	65	94	8.508630
124	23Na	23	11	12	8.485660
125	163Dy	163	66	97	8.478563
126	164Dy	164	66	98	8.473560
127	22Ne	22	10	12	8.436078
128	20Ne	20	10	10	8.423415
129	16O	16	8	8	8.367381
130	21Ne	21	10	11	8.344260
131	19F	19	9	10	8.149605
132	17O	17	8	9	8.118892
133	18O	18	8	10	8.114808
134	12C	12	6	6	8.071318
135	15N	15	7	8	8.064556
136	14N	14	7	7	7.866788
137	13C	13	6	7	7.830933
138	4He	4	2	2	7.465089
139	11B	11	5	6	7.283345
140	10B	10	5	5	6.866257
141	9Be	9	4	5	6.810379
142	7Li	7	3	4	5.941732
143	6Li	6	3	3	5.723505
144	3He	3	2	1	3.094245
145	2H	2	1	1	1.503457
146	1H	1	1	0	0.782347

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	9.04331	(β−β−)	0.134
148	86Kr	86	36	50	9.039524	(β−β−)	1.257
149	84Sr	84	38	46	9.03143	(β+β+)	1.790
150	102Pd	102	46	56	8.933112	(β+β+)	1.203
151	36Ar	36	18	18	8.911083	(β+β+)	0.433
152	122Sn	122	50	72	8.80853	(β−β−)	0.373
153	150Sm	150	62	88	8.584993	(α)	1.450
154	152Sm	152	62	90	8.563180	(α)	0.220
155	154Gd	154	64	90	8.549931	(α)	0.920
156	155Gd	155	64	91	8.536288	(α)	0.081
157	164Er	164	68	96	8.473407	(β+β+, α)	0.025, 1.305
158	165Ho	165	67	98	8.464639	(α)	0.139
159	166Er	166	68	98	8.462427	(α)	0.832
160	167Er	167	68	99	8.450296	(α)	0.667
161	168Er	168	68	100	8.446254	(α)	0.553
162	169Tm	169	69	100	8.433890	(α)	1.198
163	170Yb	170	70	100	8.428753	(α)	1.735
164	171Yb	171	70	101	8.418142	(α)	1.558
165	172Yb	172	70	102	8.415827	(α)	1.309
166	173Yb	173	70	103	8.403984	(α)	0.945
167	174Yb	174	70	104	8.398585	(α)	0.738
168	175Lu	175	71	104	8.386551	(α)	1.620
169	181Ta	181	73	108	8.338937	(α)	1.520
170	185Re	185	75	110	8.308178	(α)	2.195
171	191Ir	191	77	114	8.263511	(α)	2.083
172	194Pt	194	78	116	8.250494	(α)	1.523
173	193Ir	193	77	116	8.250263	(α)	1.018
174	195Pt	195	78	117	8.239492	(α)	1.176
175	196Pt	196	78	118	8.237872	(α)	0.813
176	197Au	197	79	118	8.229388	(α)	0.972
177	198Hg	198	80	118	8.227653	(α)	1.381
178	199Hg	199	80	119	8.219791	(α)	0.823
179	200Hg	200	80	120	8.218835	(α)	0.716
180	201Hg	201	80	121	8.208942	(α)	0.332
181	202Hg	202	80	122	8.206691	(α)	0.134
182	203Tl	203	81	122	8.198221	(α)	0.908
183	204Hg	204	80	124	8.192348	(β−β−)	0.420
184	205Tl	205	81	124	8.187517	(α)	0.155

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. These should not be considered authoritative without consulting the original source (footnote, or if none, that given in ^[4] ) 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.

No.	Nuclide	A	Z	N	Energy	Half-life (seconds)	Half-life (years) [c]	Decay mode	Decay energy (MeV)
185	134Xe	134	54	80	8.728974	>8.8×1029	>2.8×1022 [6]	(β−β−)	0.824
186	40Ca	40	20	20	8.942478	>3.1×1029	>9.9×1021	(β+β+)	0.193
187	184W	184	74	110	8.319718	>2.8×1029	>8.9×1021	(α)	1.649
188	182W	182	74	108	8.336407	>2.4×1029	>7.7×1021	(α)	1.764
189	208Pb	208	82	126	8.175878	>8.2×1028	>2.6×1021	(α)	0.517
190	206Pb	206	82	124	8.186782	>7.9×1028	>2.5×1021	(α)	1.135
191	126Xe	126	54	72	8.77883	>6.0×1028	>1.9×1021 [7]	(β+β+)	0.918
192	207Pb	207	82	125	8.179782	>6.0×1028	>1.9×1021	(α)	0.392
193	120Te	120	52	68	8.81599	>5.0×1028	>1.6×1021	(β+β+)	1.736
194	106Cd	106	48	58	8.89332	>3.5×1028	>1.1×1021	(β+β+)	2.775
195	58Ni	58	28	30	9.109747	>2.2×1028	>7.0×1020	(β+β+)	1.926
196	183W	183	74	109	8.324683	>2.1×1028	>6.7×1020	(α)	1.672
197	104Ru	104	44	60	8.91839	>2.0×1028	>6.5×1020 [8]	(β−β−)	1.299
198	54Fe	54	26	28	9.113070	>1.4×1028	>4.4×1020 [9]	(β+β+)	0.681
199	132Ba	132	56	76	8.741279	>9.5×1027	>3.0×1020	(β+β+)	0.844
200	110Pd	110	46	64	8.874326	>9.1×1027	>2.9×1020	(β−β−)	2.017
201	92Mo	92	42	50	9.014890	>6.0×1027	>1.9×1020	(β+β+)	1.650
202	204Pb	204	82	122	8.194405	>4.4×1027	>1.4×1020 [10]	(α)	1.969
203	112Sn	112	50	62	8.862881	>3.1×1027	>9.7×1019 [11]	(β+β+)	1.920
204	96Ru	96	44	52	8.967989	>2.5×1027	>8.0×1019	(β+β+)	2.715
205	192Os	192	76	116	8.25821	>1.7×1027	>5.3×1019	(β−β−, α)	0.406, 0.361
206	198Pt	198	78	120	8.22235	>1.0×1027	>3.2×1019 [12]	(β−β−, α)	1.050, 0.106
207	160Gd	160	64	96	8.495956	>9.8×1026	>3.1×1019	(β−β−)	1.730
208	186W	186	74	112	8.299859	>7.3×1026	>2.3×1019 [13]	(β−β−, α)	0.491, 1.116
209	144Sm	144	62	82	8.64052	>4.4×1026	>1.4×1019 [14]	(β+β+)	1.782
210	190Os	190	76	114	8.275043	>3.8×1026	>1.2×1019 [15]	(α)	1.376
211	64Zn	64	30	34	9.102631	>3.5×1026	>1.1×1019 [13]	(β+β+)	1.095
212	74Se	74	34	40	9.047172	>2.2×1026	>7.0×1018 [16]	(β+β+)	1.209
213	70Zn	70	30	40	9.06510	>1.2×1026	>3.8×1018	(β−β−)	0.997
214	188Os	188	76	112	8.290134	>1.0×1026	>3.3×1018 [15]	(α)	2.143
215	143Nd	143	60	83	8.658747	>9.8×1025	>3.1×1018	(α)	0.530
216	148Nd	148	60	88	8.59435	>9.5×1025	>3.0×1018	(β−β−, α)	1.928, 0.599
217	142Ce	142	58	84	8.66662	>9.1×1025	>2.9×1018	(β−β−, α)	1.417, 1.304
218	179Hf	179	72	107	8.353234	>8.5×1025	>2.7×1018 [17]	(α)	1.808
219	196Hg	196	80	116	8.23370	>7.9×1025	>2.5×1018	(β+β+, α)	0.819, 2.038
220	154Sm	154	62	92	8.541809	>7.3×1025	>2.3×1018	(β−β−)	1.251
221	146Nd	146	60	86	8.625605	>5.0×1025	>1.6×1018	(β−β−, α)	0.070, 1.182
222	50Cr	50	24	26	9.076545	>4.1×1025	>1.3×1018	(β+β+)	1.171
223	178Hf	178	72	106	8.365899	>4.1×1025	>1.3×1018 [17]	(α)	2.084
224	177Hf	177	72	105	8.370079	>3.5×1025	>1.1×1018 [17]	(α)	2.246
225	156Dy	156	66	90	8.523430	>3.2×1025	>1.0×1018 [n 1]	(β+β+, α)	2.006, 1.753
226	153Eu	153	63	90	8.550844	>1.8×1025	>5.5×1017	(α)	0.272
227	180Hf	180	72	108	8.347871	>1.5×1025	>4.6×1017 [17]	(α)	1.287
228	108Cd	108	48	60	8.89773	>1.3×1025	>4.1×1017	(β+β+)	0.272
229	170Er	170	68	102	8.424892	>1.3×1025	>4.1×1017	(β−β−, α)	0.656, 0.052
230	138Ce	138	58	80	8.705854	>1.3×1025	>4.0×1017 [19]	(β+β+)	0.696
231	180mTa	180	73	107	8.342753	>9.1×1024	>2.9×1017 [20]	(β−, ε, IT, α)	0.778, 0.921, 0.075, 2.099
232	176Hf	176	72	104	8.381411	>8.5×1024	>2.7×1017 [17]	(α)	2.254
233	46Ca	46	20	26	9.00914	>5.7×1024	>1.8×1017 [21]	(β−β−)	0.987
234	176Yb	176	70	106	8.375246	>5.0×1024	>1.6×1017	(β−β−, α)	1.085, 0.567
235	94Zr	94	40	54	8.999715	>3.5×1024	>1.1×1017	(β−β−)	1.145
236	124Sn	124	50	74	8.78286	>3.2×1024	>1.0×1017	(β−β−)	2.293
237	162Dy	162	66	96	8.492190	>3.2×1024	>1.0×1017 [18]	(α)	0.084
238	136Ce	136	58	78	8.707410	>3.0×1024	>9.6×1016 [19]	(β+β+)	2.379
239	114Cd	114	48	66	8.860923	>2.9×1024	>9.2×1016	(β−β−)	0.545
240	123Te	123	52	71	8.79629	>2.9×1024	>9.2×1016 [22]	(ε)	0.052
241	145Nd	145	60	85	8.632918	>1.9×1024	>6.0×1016	(α)	1.574
242	192Pt	192	78	114	8.26032	>1.9×1024	>6.0×1016	(α)	2.424
243	161Dy	161	66	95	8.494023	>1.1×1024	>3.5×1016 [18]	(α)	0.343
244	160Dy	160	66	94	8.506771	>2.7×1023	>8.5×1015 [18]	(α)	0.438
245	189Os	189	76	113	8.277597	>1.1×1023	>3.5×1015 [15]	(α)	1.976
246	187Os	187	76	111	8.291741	>1.0×1023	>3.2×1015 [15]	(α)	2.722
247	149Sm	149	62	87	8.589009	>6.3×1022	>2.0×1015	(α)	1.871
248	158Dy	158	66	92	8.51693	>3.2×1022	>1.0×1015 [18]	(β+β+, α)	0.283, 0.874
249	162Er	162	68	94	8.480788	>4.4×1021	>1.4×1014	(β+β+, α)	1.847, 1.648
250	168Yb	168	70	98	8.437865	>4.1×1021	>1.3×1014	(β+β+, α)	1.409, 1.938
251	98Mo	98	42	56	8.970461	>3.2×1021	>1.0×1014	(β−β−)	0.109

1. Nubase value, for alpha decay only. Double electron capture limited only to 6.1×10¹⁴ (ground state) by ^[18]

Primordial radioactive nuclides (half-life > 10⁸ years)

Main article: Primordial nuclide

Ordered by half-life.

No.	Nuclide	A	Z	N	Energy	Half-life (seconds)	Half-life (years) [c]	Decay mode	Decay energy (MeV)
252	128Te	128	52	76	8.766582	7.10×1031	2.25×1024	β−β−	0.867
253	124Xe	124	54	70	8.77829	3.47×1029	1.1×1022 [23]	εε	2.857
254	78Kr	78	36	42	9.022322	2.90×1029	9.2×1021	εε	2.848
255	136Xe	136	54	82	8.692917	6.88×1028	2.18×1021	β−β−	2.458
256	76Ge	76	32	44	9.034646	6.375×1028	2.02×1021	β−β−	2.039
257	130Ba	130	56	74	8.742524	3.2×1028	1×1021 [n 1]	εε	2.624
258	130Te	130	52	78	8.743264	2.496×1028	7.9×1020	β−β−	2.528
259	82Se	82	34	48	9.017585	2.764×1027	8.76×1019	β−β−	2.998
260	48Ca	48	20	28	8.992670	1.767×1027	5.6×1019	β−β−	4.268
261	116Cd	116	48	68	8.836081	8.489×1026	2.69×1019	β−β−	2.813
262	209Bi	209	83	126	8.158680	6.343×1026	2.01×1019	α	3.137
263	96Zr	96	40	56	8.961306	7.384×1026	2.34×1019	β−β−	3.356
264	150Nd	150	60	90	8.562518	2.935×1026	9.3×1018	β−β−	3.371
265	100Mo	100	42	58	8.933248	2.231×1026	7.07×1018	β−β−	3.034
266	151Eu	151	63	88	8.565709	1.452×1026	4.6×1018	α	1.964
267	180W	180	74	106	8.347075	5.018×1025	1.59×1018 [26]	α	2.515
268	50V	50	23	27	9.055783	8.552×1024	2.71×1017	β+ [n 2]	2.209
269	174Hf	174	72	102	8.39226	1.199×1024	3.8×1016 [27]	α	2.494
270	113Cd	113	48	65	8.859312	2.537×1023	8.04×1015	β−	0.324
271	148Sm	148	62	86	8.607373	1.988×1023	6.3×1015	α	1.987
272	144Nd	144	60	84	8.651026	7.227×1022	2.29×1015	α	1.901
273	186Os	186	76	110	8.302501	6.3×1022	2.0×1015	α	2.821
274	115In	115	49	66	8.849895	1.392×1022	4.41×1014	β−	0.497
275	152Gd	152	64	88	8.562813	3.408×1021	1.08×1014	α	2.204
276	184Os	184	76	108	8.311821	3.53×1020	1.12×1013	α	2.959
277	190Pt	190	78	112	8.267668	1.524×1019	4.83×1011	α	3.269
278	147Sm	147	62	85	8.610543	3.364×1018	1.066×1011	α	2.311
279	138La	138	57	81	8.698227	3.250×1018	1.03×1011	β+(65), β−(35)	1.748, 1.053
280	87Rb	87	37	50	9.043707	1.568×1018	4.97×1010	β−	0.282
281	187Re	187	75	112	8.291727	1.313×1018	4.16×1010	β−	0.0026
282	176Lu	176	71	105	8.374627	1.168×1018	3.70×1010	β− [n 3]	1.194
283	232Th	232	90	142	7.918531	4.418×1017	1.40×1010	α, SF	4.083
284	238U	238	92	146	7.872546	1.408×1017	4.463×109	α, SF, β−β−	4.270, 1.145
285	40K	40	19	21	8.909706	3.938×1016	1.248×109	β−(89), β+(11)	1.311, 1.504
286	235U	235	92	143	7.897196	2.222×1016	7.04×108	α, SF	4.679

1. The two experimental values ^{[24] [25]} are discordant, with a total range of (0.5–2.7)×10²¹ years; the value in the table is a rough average.
2. Also theoretically capable of β⁻ decay
3. Theoretically capable of electron capture ^[28]

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. ^[29]

No.	Nuclide	Z	N	Energy	Half-life (seconds)	Half-life (years) [c]	Decay mode	Notes
287	146Sm	62	84	8.62609	2.903×1015	9.20×107 [1]	α	ESS [29]
288	244Pu	94	150	7.826212	2.566×1015	8.13×107	α, SF (0.12)	interstellar, [30] ESS [29]
289	92Nb	41	51	9.01103	1.095×1015	3.47×107	β+	CG, [31] ESS [29]
290	236U	92	144	7.891468	7.391×1014	2.342×107	α, SF	DP
291	205Pb	82	123	8.187270	5.365×1014	1.70×107	β+	ESS [29]
292	129I	53	76	8.75742	5.093×1014	1.614×107	β−	CG, FP, ESS [29]
293	247Cm	96	151	7.80600	4.923×1014	1.56×107	α	ESS [29]
294	182Hf	72	110	8.32434	2.809×1014	8.90×106	β−	ESS [29]
295	107Pd	46	61	8.89723	2.051×1014	6.5×106	β−	FP, ESS [29]
296	97Tc	43	54	8.97053	1.329×1014	4.21×106	β+
297	98Tc	43	55	8.95328	1.325×1014	4.2×106	β−
298	53Mn	25	28	9.103211	1.168×1014	3.7×106	β+	CG, ESS [29]
299	210mBi	83	127	8.140464	9.594×1013	3.04×106	α
300	60Fe	26	34	9.09487	8.268×1013	2.62×106	β−	CG, [32] interstellar, [33] ESS [29]
301	237Np	93	144	7.881986	6.766×1013	2.144×106	α, SF	DP
302	150Gd	64	86	8.57641	5.649×1013	1.79×106	α
303	93Zr	40	53	9.008114	5.081×1013	1.61×106	β−	FP
304	154Dy	66	88	8.52842	4.418×1013	1.40×106 [34]	α
305	10Be	4	6	6.810569	4.377×1013	1.387×106	β−	CG, ESS [29]
306	135Cs	55	80	8.720074	4.197×1013	1.33×106	β−	FP
307	26Al	13	13	8.540939	2.263×1013	7.17×105	β+	CG, ESS [29]
308	242Pu	94	148	7.845215	1.183×1013	3.75×105	α, SF
309	208Bi	83	125	8.16204	1.161×1013	3.68×105	β+
310	248Cm	96	152	7.799573	1.098×1013	3.48×105	α (92), SF (8.4)
311	79Se	34	45	9.032299	1.032×1013	3.3×105	β−	FP
312	36Cl	17	19	8.891374	9.499×1012	3.01×105	β−(98), β+(1.9)	CG, IM
313	234U	92	142	7.908305	7.747×1012	2.455×105	α, SF	DP
314	126Sn	50	76	8.75398	7.258×1012	2.3×105	β−	FP
315	81Kr	36	45	9.03053	7.227×1012	2.29×105	β+	CG
316	99Tc	43	56	8.953418	6.662×1012	2.111×105	β−	FP
317	186mRe	75	111	8.295937	6.312×1012	2×105	IT
318	233U	92	141	7.912867	5.024×1012	1.592×105	α, SF	DP
319	236Np	93	143	7.8875	4.828×1012	1.53×105	β+(86), β−(14), α (0.16)
320	41Ca	20	21	8.928340	3.137×1012	9.9×104	β+	CG, ESS [29]
321	59Ni	28	31	9.107874	2.556×1012	8.1×104	β+
322	230Th	90	140	7.937133	2.379×1012	7.54×104	α, SF	DP
323	137La	57	80	8.70738	1.893×1012	6×104	β+
324	202Pb	82	120	8.19974	1.657×1012	5.25×104	β+
325	231Pa	91	140	7.926624	1.030×1012	3.27×104	α, SF	DP
326	239Pu	94	145	7.868020	7.609×1011	2.411×104	α, SF	DP, IM
327	94Nb	41	53	8.99014	6.438×1011	2.04×104	β−	CG [31]

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	7.77936	2.62×1011	8300 [n 1]	SF, α, β−
329	245Cm	96	149	7.822320	2.60×1011	8250	α, SF
330	229Th	90	139	7.94212	2.498×1011	7920	α	DP
331	243Am	95	148	7.836030	2.319×1011	7350	α, SF
332	240Pu	94	146	7.862463	2.070×1011	6561	α, SF
333	14C	6	8	7.855611	1.799×1011	5700	β−	CG, IM
334	93Mo	42	51	9.004728	1.53×1011	4839 [36]	β+
335	246Cm	96	150	7.816778	1.485×1011	4700	α, SF
336	163Ho	67	96	8.478545	1.442×1011	4570	β+
337	226Ra	88	138	7.966594	5.049×1010	1600	α	DP
338	247Bk	97	150	7.80618	4.35×1010	1380	α, SF
339	166mHo	67	99	8.451224	3.574×1010	1133	β−
340	251Cf	98	153	7.77596	2.83×1010	900	α, SF
341	91Nb	41	50	9.02338	2.15×1010	680	β+
342	194Hg	80	114	8.23722	1.41×1010	450	β+
343	108mAg	47	61	8.88148	1.385×1010	439	β+(91), IT (8.7)
344	241Am	95	146	7.851674	1.364×1010	432.6	α, SF	IM
345	249Cf	98	151	7.791307	1.108×1010	351	α, SF
346	39Ar	18	21	8.9237	8.457×109	268 [n 2]	β−	CG
347	192m2Ir	77	115	8.251878	7.605×109	241	IT
348	158Tb	65	93	8.511007	5.68×109	180	β+(83), β−(17)
349	32Si	14	18	8.823746	4.95×109	157	β−	CG
350	242mAm	95	147	7.841911	4.450×109	141	IT, α (0.46), SF
351	209Po	84	125	8.149624	3.913×109	124	α, β+(0.45)
352	63Ni	28	35	9.111205	3.194×109	101	β−	IM
353	151Sm	62	89	8.565202	2.985×109	94.6	β−	FP
354	238Pu	94	144	7.877355	2.768×109	87.7	α, SF	DP, IM
355	148Gd	64	84	8.58665	2.74×109	86.9 [37]	α
356	157Tb	65	92	8.522043	2.24×109	71	β+
357	232U	92	140	7.922140	2.174×109	68.9	α, SF
358	44Ti	22	22	8.92470	1.865×109	59.1	β+
359	193Pt	78	115	8.249969	1.58×109	50	β+
360	121mSn	50	71	8.808428	1.385×109	43.9	IT (78), β−(22)	FP
361	150Eu	63	87	8.56993	1.164×109	36.9	β+
362	42Ar	18	24	8.8909	1.038×109	32.9	β−
363	207Bi	83	124	8.16820	9.852×108	31.22	β+
364	178m2Hf	72	106	8.352157	9.783×108	31	IT
365	137Cs	55	82	8.703039	9.480×108	30.04	β−	FP, IM
366	243Cm	96	147	7.836002	9.183×108	29.1	α, β+(0.3), SF
367	90Sr	38	52	9.02633	9.123×108	28.91	β−	FP, IM
368	210Pb	82	128	8.141453	7.006×108	22.2	β−, α	DP, IM
369	227Ac	89	138	7.957444	6.871×108	21.772	β−(99), α (1.4)	DP
370	244Cm	96	148	7.831762	5.715×108	18.11	α, SF
371	145Pm	61	84	8.63178	5.586×108	17.7	β+, α
372	93mNb	41	52	9.00876	5.087×108	16.1	IT	FP
373	241Pu	94	147	7.851587	4.522×108	14.33	β−, α, SF
374	113mCd	48	65	8.845980	4.383×108	13.9	β−, IT (0.10)	FP
375	152Eu	63	89	8.550848	4.266×108	13.517	β+(72), β−(28)
376	250Cf	98	152	7.786637	4.128×108	13.08	α, SF (0.08)
377	3H	1	2	3.088048	3.888×108	12.32	β−	CG, IM
378	85Kr	36	49	9.02991	3.385×108	10.728	β−	FP, IM
379	133Ba	56	77	8.729615	3.326×108	10.538	β+

1. 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. ^[35]
2. 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	7.7966	>2.84×108	> 9 y [d]	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	8.537152	2.711×108	8.592 y	β−, β+	FP
382	194Os	76	118	8.23851	1.893×108	6.0 y	β−
383	228Ra	88	140	7.944387	1.815×108	5.75 y	β−	DP
384	146Pm	61	85	8.61552	1.745×108	5.53 y	β+(66), β−(34)
385	60Co	27	33	9.098825	1.664×108	5.271 y	β−	IM
386	155Eu	63	92	8.534662	1.496×108	4.742 y	β−	FP
387	101Rh	45	56	8.93678	1.284×108	4.07 y	β+
388	204Tl	81	123	8.190662	1.194×108	3.78 y	β−(97), β+(2.9)	IM
389	102mRh	45	57	8.92075	1.181×108	3.74 y	β+, IT (0.2)
390	174Lu	71	103	8.390688	1.045×108	3.31 y	β+
391	208Po	84	124	8.155305	9.145×107	2.898 y	α, β+
392	236Pu	94	142	7.889532	9.019×107	2.858 y	α, SF
393	125Sb	51	74	8.77736	8.702×107	2.758 y	β−	FP
394	55Fe	26	29	9.116434	8.698×107	2.756 y	β+
395	252Cf	98	154	7.769593	8.347×107	2.645 y	α (97), SF (3.1)	IM
396	147Pm	61	86	8.609019	8.279×107	2.623 y	β−	FP
397	22Na	11	11	8.306836	8.211×107	2.602 y	β+	CG
398	134Cs	55	79	8.719760	6.517×107	2.065 y	β−, β+	FP
399	171Tm	69	102	8.417577	6.059×107	1.92 y	β−
400	228Th	90	138	7.953902	6.035×107	1.913 y	α	DP
401	172Hf	72	100	8.3992	5.901×107	1.87 y	β+
402	179Ta	73	106	8.352645	5.743×107	1.82 y	β+
403	173Lu	71	102	8.400110	4.323×107	1.37 y	β+
404	252Es	99	153	7.7646	4.075×107	1.291 y	α (78), β+(22)
405	109Cd	48	61	8.88328	3.986×107	1.263 y	β+
406	235Np	93	142	7.896667	3.422×107	1.084 y	β+, α
407	106Ru	44	62	8.88569	3.212×107	1.018 y	β−	FP
408	144Pm	61	83	8.63671	3.136×107	0.99 y	β+
409	145Sm	62	83	8.62753	2.938×107	340 d	β+
410	248Cf	98	150	7.80020	2.881×107	333.5 d	α, SF
411	49V	23	26	9.05014	2.851×107	330 d	β+
412	249Bk	97	152	7.790811	2.827×107	327.2 d	β−, α, SF
413	54Mn	25	29	9.10017	2.696×107	312.08 d	β+, β−	IM
414	119mSn	50	69	8.827415	2.532×107	293.1 d	IT	FP
415	144Ce	58	86	8.62987	2.461×107	284.89 d	β−	FP
416	254Es	99	155	7.74851	2.382×107	275.7 d	α, β−, SF
417	57Co	27	30	9.112471	2.348×107	271.81 d	β+	IM
418	68Ge	32	36	9.05630	2.342×107	271.05 d	β+	IM
419	143Pm	61	82	8.65146	2.290×107	265 d	β+
420	110m2Ag	47	63	8.86532	2.159×107	249.86 d	β−(99), IT (1.3)	IM
421	65Zn	30	35	9.085349	2.108×107	243.94 d	β+	IM
422	153Gd	64	89	8.547677	2.079×107	240.6 d	β+	IM
423	102Rh	45	57	8.92213	1.788×107	207 d	β+(78), β−(22)
424	195Au	79	116	8.238329	1.607×107	186.01 d	β+
425	184mRe	75	109	8.31062	1.531×107	177.25 d [38]	IT (75), β+(25)
426	194m2Ir	77	117	8.2371	1.477×107	171 d	β−
427	121mTe	52	69	8.8007	1.423×107	164.7 d	IT (89), β+(11)
428	242Cm	96	146	7.844857	1.407×107	162.8 d	α, SF
429	45Ca	20	25	8.978256	1.405×107	162.61 d	β−
430	177m3Lu	71	106	8.361791	1.386×107	160.4 d	β−(77), IT (23)
431	159Dy	66	93	8.506332	1.248×107	144.4 d	β+
432	174mLu	71	103	8.389706	1.227×107	142 d	IT (99), ε (0.6)
433	210Po	84	126	8.147285	1.196×107	138.376 d	α	DP
434	139Ce	58	81	8.69691	1.189×107	137.64 d	β+
435	123Sn	50	73	8.78526	1.116×107	129.2 d	β−	FP
436	170Tm	69	101	8.423055	1.111×107	128.6 d	β−, β+(0.13)
437	151Gd	64	87	8.56264	1.070×107	123.9 d	β+, α
438	181W	74	107	8.337804	1.045×107	120.96 d	β+
439	75Se	34	41	9.033478	1.035×107	119.78 d	β+	IM
440	123mTe	52	71	8.79427	1.030×107	119.2 d	IT
441	113Sn	50	63	8.85298	9.943×106	115.08 d	β+
442	182Ta	73	109	8.326432	9.914×106	114.7 d	β−
443	88Y	39	49	9.02926	9.213×106	106.63 d	β+
444	127mTe	52	75	8.76575	9.167×106	106.1 d	IT (98), β−(2.1)	FP
445	257Fm	100	157	7.72661	8.683×106	100.5 d	α, SF (0.2)
446	168Tm	69	99	8.43627	8.044×106	93.1 d	β+, β−
447	149Eu	63	86	8.58434	8.044×106	93.1 d	β+
448	185Os	76	109	8.302701	8.031×106	92.95 d	β+
449	97mTc	43	54	8.96953	7.871×106	91.1 d	IT (96), ε (3.9)
450	35S	16	19	8.895496	7.549×106	87.37 d	β−	CG
451	83Rb	37	46	9.02398	7.448×106	86.2 d	β+
452	46Sc	21	25	8.97918	7.237×106	83.76 d	β−	IM
453	88Zr	40	48	9.02165	7.206×106	83.4 d	β+
454	73As	33	40	9.04328	6.938×106	80.3 d	β+
455	56Co	27	29	9.072041	6.673×106	77.24 d	β+
456	185W	74	111	8.305847	6.489×106	75.1 d	β−
457	192Ir	77	115	8.252754	6.378×106	73.82 d	β−(95), ε (4.8)	IM
458	160Tb	65	95	8.495296	6.247×106	72.3 d	β−
459	58Co	27	31	9.10317	6.121×106	70.84 d	β+
460	183Re	75	108	8.32165	6.048×106	70 d	β+
461	175Hf	72	103	8.38264	6.039×106	69.90 d [39]	β+
462	188W	74	114	8.27700	6.028×106	69.77 d	β−
463	85Sr	38	47	9.02547	5.603×106	64.846 d	β+
464	95Zr	40	55	8.973001	5.532×106	64.032 d	β−	FP
465	95mTc	43	52	8.97639	5.363×106	62.0 d	β+(96), IT (3.9)
466	91mNb	41	50	9.02223	5.258×106	60.86 d	IT (97), ε (3.4)
467	254Cf	98	156	7.75108	5.227×106	60.5 d	SF, α (0.3)
468	124Sb	51	73	8.77792	5.194×106	60.12 d	β−
469	125I	53	72	8.78201	5.131×106	59.392 d	β+	IM
470	91Y	39	52	9.02023	5.055×106	58.51 d	β−	FP
471	125mTe	52	73	8.78233	4.959×106	57.4 d	IT	FP
472	148Eu	63	85	8.58684	4.709×106	54.5 d	β+, α
473	7Be	4	3	5.81860	4.598×106	53.22 d	β+	CG
474	258Md [d]	101	157	7.71593	4.457×106	51.6 d	α, SF
475	89Sr	38	51	9.039959	4.369×106	50.56 d	β−	FP, IM
476	114mIn	49	65	8.846577	4.278×106	49.51 d	IT (97), β+(3.2)
477	146Gd	64	82	8.59246	4.171×106	48.27 d	β+
478	203Hg	80	123	8.195797	4.027×106	46.61 d	β−
479	237Pu	94	143	7.881058	3.943×106	45.64 d	β+, α
480	115mCd	48	67	8.835696	3.850×106	44.6 d	β−	FP
481	59Fe	26	33	9.099538	3.845×106	44.50 d	β−	IM
482	181Hf	72	109	8.333213	3.662×106	42.39 d	β−
483	105Ag	47	58	8.90057	3.567×106	41.29 d	β+
484	148mPm	61	87	8.58975	3.567×106	41.29 d	β−(96), IT (4.2)
485	255Es	99	156	7.74156	3.439×106	39.8 d	β−(92), α (8.0), SF
486	103Ru	44	59	8.918572	3.391×106	39.245 d	β−	FP
487	127Xe	54	73	8.76676	3.140×106	36.342 d	β+
488	184Re	75	109	8.31164	3.059×106	35.4 d	β+
489	37Ar	18	19	8.907742	3.025×106	35.01 d	β+	CG
490	95Nb	41	54	8.984858	3.023×106	34.991 d	β−	FP
491	129mTe	52	77	8.744957	2.903×106	33.6 d	IT (64), β−(36)	FP
492	84Rb	37	47	9.02083	2.836×106	32.82 d	β+(96), β−(3.9)
493	241Cm	96	145	7.848489	2.834×106	32.8 d	β+(99), α (1.0)
494	141Ce	58	83	8.677212	2.808×106	32.505 d	β−	FP
495	169Yb	70	99	8.428570	2.766×106	32.014 d	β+	IM
496	240Cm	96	144	7.855801	2.627×106	30 d	α, SF
497	260Md	101	159		2.402×106	27.8 d	SF
498	51Cr	24	27	9.080156	2.393×106	27.702 d	β+	IM
499	233Pa	91	142	7.910419	2.331×106	26.98 d	β−	DP
500	33P	15	18	8.86942	2.190×106	25.35 d	β−
501	82Sr	38	44	8.99827	2.190×106	25.35 d	β+	IM
502	179m2Hf	72	107	8.347053	2.160×106	25.0 d	IT
503	234Th	90	144	7.89776	2.083×106	24.11 d	β−	DP
504	147Eu	63	84	8.59883	2.082×106	24.1 d	β+, α
505	178W	74	104	8.35450	1.866×106	21.6 d	β+
506	253Es	99	154	7.759024	1.769×106	20.47 d	α, SF
507	230U	92	138	7.93386	1.748×106	20.23 d	α
508	121Te	52	69	8.8031	1.668×106	19.31 d	ε
509	227Th	90	137	7.957641	1.615×106	18.693 d	α	DP, IM
510	86Rb	37	49	9.033493	1.611×106	18.645 d	β−, β+
511	253Cf	98	155	7.75787	1.539×106	17.81 d	β−, α (0.3)
512	74As	33	41	9.02889	1.535×106	17.8 d	β+(66), β−(34)
513	230Pa	91	139	7.93143	1.503×106	17.4 d	β+(92), β−(7.8), α
514	103Pd	46	57	8.920415	1.468×106	16.99 d	β+	IM
515	99Rh	45	54	8.9358	1.391×106	16.1 d	β+
516	48V	23	25	8.99794	1.380×106	15.97 d	β+
517	156Eu	63	93	8.52057	1.312×106	15.19 d	β−	FP
518	191Os	76	115	8.261869	1.295×106	14.99 d	β−
519	205Bi	83	122	8.17408	1.288×106	14.91 d	β+
520	225Ra	88	137	7.97357	1.280×106	14.8 d	β−, α [40]	DP
521	32P	15	17	8.830846	1.233×106	14.269 d	β−	CG, IM
522	117mSn	50	67	8.841259	1.204×106	13.94 d	IT	FP
523	143Pr	59	84	8.65221	1.172×106	13.57 d	β−	FP
524	189Ir	77	112	8.27476	1.140×106	13.2 d	β+
525	136Cs	55	81	8.70616	1.124×106	13.01 d	β−
526	126I	53	73	8.76902	1.117×106	12.93 d	β+(53), β−(47)
527	140Ba	56	84	8.66609	1.102×106	12.753 d	β−	FP
528	126Sb	51	75	8.7570	1.067×106	12.35 d	β−	FP
529	202Tl	81	121	8.199934	1.064×106	12.31 d	β+
530	131mXe	54	77	8.744980	1.032×106	11.95 d	IT	FP
531	190Ir	77	113	8.264758	1.015×106	11.751 d [41]	β+
532	131Ba	56	75	8.732990	9.953×105	11.52 d	β+
533	71Ge	32	39	9.05592	9.908×105	11.468 d [42]	β+
534	223Ra	88	135	7.994039	9.880×105	11.435 d	α	DP, IM
535	147Nd	60	87	8.602929	9.487×105	10.98 d	β−	FP
536	246Pu	94	152	7.80548	9.366×105	10.84 d	β−
537	193mIr	77	116	8.249847	9.098×105	10.53 d	IT
538	188Pt	78	110	8.27249	8.778×105	10.2 d	β+, α
539	92mNb	41	51	9.00956	8.740×105	10.12 d	β+
540	225Ac	89	136	7.97515	8.570×105	9.919 d	α	DP, IM
541	131Cs	55	76	8.743498	8.371×105	9.69 d	β+	IM
542	125Sn	50	75	8.75847	8.324×105	9.63 d	β−	FP
543	169Er	68	101	8.431799	8.115×105	9.39 d	β−	IM
544	149Gd	64	85	8.57553	8.018×105	9.28 d	β+, α
545	167Tm	69	98	8.445828	7.992×105	9.25 d	β+
546	129mXe	54	75	8.757054	7.672×105	8.88 d	IT
547	206Po	84	122	8.15961	7.603×105	8.8 d	β+(95), α (5.4)
548	72Se	34	38	9.01393	7.258×105	8.40 d	β+
549	106mAg	47	59	8.89068	7.154×105	8.28 d	β+
550	171Lu	71	100	8.40950	7.125×105	8.25 d	β+
551	131I	53	78	8.738820	6.934×105	8.025 d	β−	FP, IM
552	257Es	99	158		6.653×105	7.7 d	β−, SF
553	111Ag	47	64	8.86605	6.422×105	7.43 d	β−	FP
554	161Tb	65	96	8.490335	6.003×105	6.948 d	β−	FP
555	237U	92	145	7.879799	5.834×105	6.752 d	β−	DP
556	172Lu	71	101	8.40118	5.789×105	6.70 d	β+
557	177Lu	71	106	8.367272	5.741×105	6.644 d	β−	IM
558	132Cs	55	77	8.731566	5.599×105	6.48 d	β+(98), β−(1.6)
559	206Bi	83	123	8.16854	5.394×105	6.243 d	β+
560	196Au	79	117	8.23042	5.327×105	6.17 d	β+(93), β−(7)
561	56Ni	28	28	9.033954	5.249×105	6.075 d	β+
562	118Te	52	66	8.8145	5.184×105	6.00 d	β+
563	145Eu	63	82	8.60919	5.124×105	5.93 d	β+
564	120mSb [d]	51	69		4.977×105	5.76 d	β+
565	52Mn	25	27	9.046537	4.831×105	5.591 d	β+
566	148Pm	61	87	8.59068	4.638×105	5.368 d	β−
567	156Tb [d]	65	91	8.52062	4.622×105	5.35 d	β+
568	133Xe	54	79	8.73029	4.534×105	5.247 d	β−	FP, IM
569	155Tb	65	90	8.53100	4.523×105	5.235 d [43]	β+
570	183Ta	73	110	8.318824	4.406×105	5.1 d	β−
571	210Bi	83	127	8.141756	4.330×105	5.012 d	β−, α	DP
572	245Bk	97	148	7.819017	4.277×105	4.95 d	β+, α (0.12)
573	119mTe	52	67	8.80176	4.061×105	4.70 d	β+
574	146Eu	63	83	8.59952	3.983×105	4.61 d	β+
575	47Ca	20	27	8.97227	3.919×105	4.536 d	β−
576	234Np	93	141	7.90057	3.802×105	4.4 d	β+
577	101mRh	45	56	8.93523	3.752×105	4.34 d	ε (93), IT (7.2)
578	193mPt	78	115	8.249193	3.741×105	4.33 d	IT
579	96Tc	43	53	8.96530	3.698×105	4.28 d	β+
580	231U	92	139	7.92497	3.629×105	4.2 d	β+, α
581	175Yb	70	105	8.383864	3.616×105	4.185 d	β−
582	124I	53	71	8.77587	3.608×105	4.176 d	β+	IM
583	195mPt	78	117	8.238163	3.465×105	4.010 d	IT
584	127Sb	51	76	8.75398	3.326×105	3.85 d	β−	FP
585	222Rn	86	136	7.997570	3.302×105	3.822 d	α	DP
586	186Re	75	111	8.296734	3.213×105	3.719 d	β−(93), ε (7.5)	IM
587	224Ra	88	136	7.987274	3.138×105	3.632 d	α	DP
588	100Pd	46	54	8.9234	3.136×105	3.63 d	β+
589	95mNb	41	54	8.982377	3.119×105	3.61 d	IT (94), β−(5.6)	FP
590	166Dy	66	100	8.448333	2.938×105	3.40 d	β−
591	140Nd	60	80	8.67315	2.912×105	3.37 d	β+
592	47Sc	21	26	9.01465	2.894×105	3.349 d	β−	IM
593	87Y	39	48	9.02555	2.873×105	3.33 d	β+
594	89Zr	40	49	9.02500	2.821×105	3.265 d	β+
595	67Ga	31	36	9.06952	2.818×105	3.262 d	β+	IM
596	132Te	52	80	8.71668	2.768×105	3.20 d	β−	FP
597	134Ce	58	76	8.7044	2.730×105	3.16 d	β+
598	199Au	79	120	8.217518	2.712×105	3.139 d	β−
599	201Tl	81	120	8.20655	2.628×105	3.042 d	β+	IM
600	253Fm	100	153	7.757700	2.592×105	3.0 d	β+(88), α (12)
601	97Ru	44	53	8.95916	2.451×105	2.837 d	β+
602	191Pt	78	113	8.25822	2.445×105	2.83 d	β+
603	111In	49	62	8.86764	2.423×105	2.805 d	β+	IM
604	99Mo	42	57	8.939703	2.374×105	2.747 d	β−	FP, IM
605	122Sb	51	71	8.79537	2.353×105	2.724 d	β−(98), β+(2.4)
606	71As	33	38	9.02756	2.350×105	2.721 d	β+
607	197Hg	80	117	8.22634	2.337×105	2.705 d	β+
608	198Au	79	119	8.220716	2.328×105	2.695 d	β−	IM
609	182Re [d]	75	107		2.311×105	2.68 d	β+
610	90Y	39	51	9.032395	2.306×105	2.669 d	β−	FP, IM
611	172Tm	69	103	8.40489	2.290×105	2.65 d	β−
612	67Cu	29	38	9.07609	2.226×105	2.576 d	β−	IM
613	44m3Sc	21	23	8.92461	2.110×105	2.442 d	IT, β+
614	128Ba	56	72	8.73826	2.100×105	2.43 d	β+
615	77Br	35	42	9.02242	2.053×105	2.377 d	β+
616	166Yb	70	96	8.44237	2.041×105	2.363 d	β+
617	239Np	93	146	7.864996	2.036×105	2.356 d	β−	DP
618	177Ta	73	104	8.36349	2.029×105	2.348 d	β+
619	153Tb	65	88	8.53742	2.022×105	2.34 d	β+
620	66Ni	28	38	9.07141	1.966×105	2.28 d	β−
621	247Pu	94	153		1.961×105	2.27 d	β−
622	198m2Au	79	119	8.216616	1.963×105	2.27 d	IT
623	115Cd	48	67	8.837270	1.925×105	2.228 d	β−	FP
624	149Pm	61	88	8.58182	1.911×105	2.212 d	β−	FP
625	133mXe	54	79	8.72854	1.899×105	2.20 d	IT	FP
626	203Pb	82	121	8.19342	1.869×105	2.164 d	β+
627	240Am	95	145	7.85669	1.829×105	2.12 d	β+, α
628	238Np	93	145	7.871929	1.814×105	2.099 d	β−
629	172Er	68	104	8.39971	1.775×105	2.05 d	β−
630	170Lu	71	99	8.4084	1.738×105	2.01 d	β+
631	72Zn	30	42	9.01778	1.674×105	1.938 d	β−
632	153Sm	62	91	8.545567	1.666×105	1.929 d	β−	FP, IM
633	202Pt	78	124	8.1837	1.584×105	1.83 d	β−
634	48Sc	21	27	8.9985	1.572×105	1.820 d	β−
635	246Bk	97	149	7.8113	1.555×105	1.80 d	β+
636	195mHg	80	115	8.2295	1.498×105	1.733 d	IT (54), β+(46)
637	188Ir	77	111	8.27528	1.494×105	1.73 d	β+
638	140La	57	83	8.673547	1.450×105	1.679 d	β−	FP, IM
639	254mEs	99	155	7.74819	1.415×105	1.638 d	β−, α (0.3), ε (0.08)
640	69Ge	32	37	9.04379	1.406×105	1.627 d	β+
641	133mBa	56	77	8.727447	1.400×105	1.621 d	IT, ε
642	77As	33	44	9.03127	1.396×105	1.616 d	β−	FP
643	119Sb	51	68	8.82322	1.375×105	1.591 d	β+
644	147Gd	64	83	8.58395	1.370×105	1.586 d	β+
645	194Au	79	115	8.23736	1.369×105	1.584 d	β+
646	229Pa	91	138	7.94076	1.339×105	1.55 d	β+, α (0.5)
647	246Cf	98	148	7.810789	1.285×105	1.49 d	α, SF
648	57Ni	28	29	9.05525	1.282×105	1.483 d	β+
649	105Rh	45	60	8.90800	1.272×105	1.473 d	β−	FP
650	82Br	35	47	9.01642	1.270×105	1.470 d	β−
651	79Kr	36	43	9.01362	1.261×105	1.46 d	β+
652	137mCe	58	79	8.696606	1.238×105	1.43 d	IT (99), β+(0.8)
653	169Lu	71	98	8.41500	1.226×105	1.419 d	β+
654	143Ce	58	85	8.64199	1.189×105	1.377 d	β−	FP
655	251Es	99	152	7.77446	1.188×105	1.38 d	β+, α (0.5)
656	131mTe	52	79	8.720393	1.169×105	1.353 d	β−(74), IT (26)	FP
657	83Sr	38	45	8.99660	1.167×105	1.350 d	β+
658	129Cs	55	74	8.74960	1.154×105	1.336 d	β+
659	232Pa	91	141	7.91637	1.140×105	1.32 d	β−
660	165Tm	69	96	8.45271	1.082×105	1.253 d	β+
661	193Os	76	117	8.24435	1.074×105	1.243 d	β−
662	226Ac	89	137	7.96376	1.057×105	1.224 d	β−(83), β+(17), α
663	160Er	68	92	8.4842	1.029×105	1.191 d	β+
664	151Pm	61	90	8.55732	1.022×105	1.183 d	β−	FP
665	135mBa	56	79	8.720077	1.012×105	1.171 d	IT
666	121Sn	50	71	8.808480	9.731×104	1.126 d	β−	FP
667	166Ho	67	99	8.451260	9.652×104	1.117 d	β−	IM
668	76As	33	43	9.02252	9.446×104	1.093 d	β−
669	200Tl	81	119	8.20655	9.396×104	1.088 d	β+
670	72As	33	39	9.01896	9.360×104	1.083 d	β+
671	231Th	90	141	7.924929	9.187×104	1.063 d	β−	DP
672	252Fm	100	152	7.76649	9.140×104	1.058 d	α, SF
673	156m2Tb [d]	65	91		8.78×104	1.02 d	IT
674	189Re	75	114	8.27227	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	8.22483	8.575×104	23.82	IT
676	187W	74	113	8.284708	8.571×104	23.81	β−
677	248mBk [d]	97	151	7.79669	8.532×104	23.7	β−(70), ε (30)
678	173Hf	72	101	8.3916	8.496×104	23.6	β+
679	96Nb	41	55	8.963014	8.406×104	23.35	β−
680	154m2Tb [d]	65	89		8.17×104	22.7	β+
681	236mNp	93	143	7.88726	8.1×104	22.5	ε (50), β−(50)
682	43K	19	24	8.921909	8.028×104	22.3	β−
683	228Pa	91	137	7.94446	7.92×104	22	β+(98), α (2)
684	182Os	76	106	8.3164	7.862×104	21.8	β+
685	48Cr	24	24	8.9634	7.762×104	21.56	β+
686	154m1Tb [d]	65	89		7.74×104	21.5	β+
687	200Pb	82	118	8.20257	7.740×104	21.5	β+
688	112Pd	46	66	8.84204	7.574×104	21.0	β−	FP
689	28Mg	12	16	8.607745	7.529×104	20.92	β−	CG
690	133I	53	80	8.71686	7.499×104	20.83	β−	FP
691	100Rh	45	55	8.9272	7.488×104	20.8	β+
692	122Xe	54	68	8.77095	7.236×104	20.1	β+
693	255Fm	100	155	7.74269	7.225×104	20.07	α, SF
694	181Re	75	106	8.32832	7.164×104	19.9	β+
695	197Pt	78	119	8.225733	7.161×104	19.89	β−
696	194Ir	77	117	8.239008	6.966×104	19.35	β−
697	95Tc	43	52	8.97680	6.933×104	19.26	β+
698	142Pr	59	83	8.66136	6.883×104	19.1	β−, ε
699	135La	57	78	8.71312	6.808×104	18.91	β+
700	200mAu	79	121	8.2025	6.732×104	18.7	β−(84), IT (16)
701	159Gd	64	95	8.502525	6.652×104	18.48	β−	FP
702	152Tb	65	87	8.5366	6.436×104	17.88 [44]	β+
703	135Ce	58	77	8.69810	6.372×104	17.7	β+
704	193Au	79	114	8.24440	6.354×104	17.7	β+
705	151Tb	65	86	8.54565	6.339×104	17.61	β+, α
706	55Co	27	28	9.053682	6.311×104	17.53	β+
707	188Re	75	113	8.278855	6.122×104	17.01	β−	IM
708	125Xe	54	71	8.76891	6.073×104	16.87	β+
709	97Zr	40	57	8.926336	6.030×104	16.75	β−	FP
710	186Ir	77	109	8.28192	5.990×104	16.64	β+
711	86Zr	40	46	8.97793	5.940×104	16.5	β+
712	76Br	35	41	8.9962	5.832×104	16.2	β+
713	119Te	52	67	8.80395	5.778×104	16.05	β+
714	242Am	95	147	7.842111	5.767×104	16.02	β−(83), ε (17)
715	170Hf	72	98	8.4022	5.764×104	16.0	β+
716	268Db	105	163		5.76×104	16 [n 1]	α (51), SF (49) [45]
717	157Eu	63	94	8.51373	5.465×104	15.18	β−	FP
718	24Na	11	13	8.422064	5.384×104	14.96	β−	CG, IM
719	76Kr	36	40	8.97940	5.328×104	14.8	β+
720	86Y	39	47	8.9932	5.306×104	14.74	β+
721	90Nb	41	49	8.98978	5.256×104	14.60	β+
722	211Rn	86	125	8.11281	5.256×104	14.6	β+(73), α (27)
723	185Ir	77	108	8.28192	5.184×104	14.4	β+
724	182mRe [d]	75	107	8.3207	5.090×104	14.1	β+
725	240U	92	148	7.85167	5.076×104	14.1	β−
726	72Ga	31	41	9.02393	5.049×104	14.03	β−
727	69mZn	30	39	9.05653	4.949×104	13.75	IT, β−
728	109Pd	46	63	8.87505	4.892×104	13.6	β−	FP
729	87mY	39	48	9.02118	4.813×104	13.37	IT (98), β+(1.6)
730	123I	53	70	8.78630	4.760×104	13.2	β+	IM
731	191mOs	76	115	8.261479	4.716×104	13.10	IT
732	183Os	76	107	8.3099	4.680×104	13.0	β+
733	150mEu	63	87	8.56965	4.608×104	12.8	β−(89), β+(11)
734	64Cu	29	35	9.093574	4.572×104	12.70	β+(62), β−(38)	IM
735	200Pt	78	122	8.2043	4.536×104	12.6	β−
736	130I	53	77	8.74006	4.450×104	12.36	β−
737	42K	19	23	8.905176	4.448×104	12.36	β−	IM
738	171Hf	72	99	8.3955	4.356×104	12.1	β+
739	239Am	95	144	7.864664	4.284×104	11.9	β+, α
740	193mHg	80	113	8.23153	4.248×104	11.8	β+(93), IT (7.2)
741	203Bi	83	120	8.17735	4.234×104	11.76	β+
742	204Bi	83	121	8.17252	4.039×104	11.22	β+
743	77Ge	32	45	8.996161	4.036×104	11.21	β−	FP
744	266Lr	103	163		3.96×104	11 [n 1]	SF
745	189Pt	78	111	8.26428	3.913×104	10.9	β+
746	195Hg	80	115	8.2304	3.848×104	10.7	β+
747	212Pb	82	130	8.106926	3.826×104	10.63	β−	DP, IM
748	175Ta	73	102	8.3708	3.78×104	10.5	β+
749	187Ir	77	110	8.2828	3.78×104	10.5	β+
750	245Pu	94	151	7.81345	3.78×104	10.5	β−
751	165Er	68	97	8.462357	3.730×104	10.36	β+
752	93Y	39	54	8.9770	3.665×104	10.18	β−	FP
753	244Am	95	149	7.825912	3.604×104	10.01	β−
754	154Tb [d]	65	89	8.5269	3.598×104	9.99	β+
755	155Dy	66	89	8.51749	3.564×104	9.9	β+
756	183mOs	76	107	8.3090	3.564×104	9.9	β+(85), IT(15)
757	91Sr	38	53	8.99057	3.474×104	9.65	β−	FP
758	196m2Au	79	117	8.22715	3.457×104	9.60	IT
759	156Sm	62	94	8.51594	3.384×104	9.4	β−	FP
760	127Te	52	75	8.76644	3.366×104	9.35	β−	FP
761	201Pb	82	119	8.19704	3.359×104	9.33	β+
762	152mEu	63	89	8.550548	3.352×104	9.31	β-(73), β+(27)
763	66Ga	31	35	9.03683	3.349×104	9.30	β+
764	62Zn	30	32	9.057900	3.309×104	9.19	β+
765	135Xe	54	81	8.71141	3.290×104	9.14	β−	FP
766	128Sb	51	77	8.7325	3.244×104	9.01	β−	FP
767	137Ce	58	79	8.698463	3.24×104	9.0	β+
768	58mCo	27	31	9.10274	3.187×104	8.85	IT, β+
769	234Pu	94	140	7.89888	3.168×104	8.8	β+(94), α (6)
770	184Ta	73	111	8.3041	3.132×104	8.7	β−
771	250Es [d]	99	151		3.096×104	8.6	β+
772	101Pd	46	55	8.91718	3.049×104	8.47	β+
773	52Fe	26	26	9.000782	2.979×104	8.28	β+
774	173Tm	69	104	8.39650	2.966×104	8.24	β−
775	180Ta	73	107	8.34317	2.935×104	8.15	ε (85), β−(15)
776	157Dy	66	91	8.51352	2.930×104	8.14	β+
777	210At	85	125	8.12833	2.916×104	8.1	β+, α (0.2)
778	176Ta	73	103	8.3632	2.912×104	8.09	β+
779	166Tm	69	97	8.44413	2.772×104	7.70	β+
780	256Es [d]	99	157		2.736×104	7.6	β−
781	171Er	68	103	8.408849	2.706×104	7.52	β−
782	199Tl	81	118	8.2123	2.671×104	7.42	β+
783	211At	85	126	8.12652	2.597×104	7.21	β+(58), α (42)	IM
784	73Se	34	39	9.00593	2.574×104	7.15	β+
785	93mMo	42	51	8.978653	2.466×104	6.85	IT, β+(0.1)
786	234Pa	91	143	7.89893	2.412×104	6.70	β−	DP
787	135I	53	82	8.69190	2.369×104	6.58	β−	FP
788	107Cd	48	59	8.88431	2.340×104	6.50	β+
789	82mRb	37	45	8.99960	2.330×104	6.47	β+
790	153Dy	66	87	8.52323	2.304×104	6.4	β+, α
791	127Cs	55	72	8.75037	2.250×104	6.25	β+
792	228Ac	89	139	7.944587	2.214×104	6.15	β−	DP
793	99mTc	43	56	8.951977	2.162×104	6.01	IT, β−	FP, IM
794	145Pr	59	86	8.62046	2.154×104	5.98	β−	FP
795	189mOs	76	113	8.277435	2.092×104	5.81	IT
796	207Po	84	123	8.15415	2.088×104	5.80	β+, α
797	111mPd	46	65	8.844414	2.003×104	5.56	IT (77), β−(23)
798	90Mo	42	48	8.96213	2.002×104	5.56	β+
799	180mHf	72	108	8.341529	1.991×104	5.53	IT, β−(0.3)
800	257Md	101	156	7.725044	1.987×104	5.52	ε (85), α (15)
801	139mNd	60	79	8.6597	1.980×104	5.50	β+(87), IT (13)
802	209At	85	124	8.13296	1.951×104	5.42	β+(96), α (3.9)
803	113Ag	47	66	8.8415	1.933×104	5.37	β−
804	156m1Tb	65	91	8.52006	1.908×104	5.3	IT
805	198Tl	81	117	8.21035	1.908×104	5.3	β+
806	251Fm	100	151	7.76869	1.908×104	5.30	β+(98), α (1.8)
807	133mCe	58	75	8.6907	1.836×104	5.1	β+
808	138Nd	60	78	8.66564	1.814×104	5.04	β+
809	160mHo	67	93	8.48583	1.807×104	5.02	IT (73), β+(27)
810	244Bk	97	147	7.82249	1.807×104	5.02	β+, α
811	118m2Sb	51	67	8.81493	1.800×104	5.00	β+
812	243Pu	94	149	7.83364	1.784×104	4.96	β−
813	192Au	79	113	8.24201	1.778×104	4.94	β+
814	110In	49	61	8.8574	1.771×104	4.92	β+
815	94Tc	43	51	8.96662	1.758×104	4.88	β+
816	85mY	39	46	8.9869	1.750×104	4.86	β+
817	73Ga	31	42	9.02610	1.750×104	4.86	β−
818	192Hg	80	112	8.23804	1.746×104	4.85	β+
819	99mRh	45	54	8.9352	1.69×104	4.7	β+
820	243Bk	97	146	7.82980	1.66×104	4.6	β+, α (0.15)
821	264Lr	103	161		1.66×104	4.6 [n 1]	SF [45]
822	132La	57	75	8.7056	1.652×104	4.59	β+
823	179Lu	71	108	8.34539	1.652×104	4.59	β−
824	81Rb	37	44	9.00289	1.646×104	4.57	β+	IM
825	115mIn	49	66	8.846971	1.615×104	4.49	IT (95), β−(5.0)	FP
826	85mKr	36	49	9.02632	1.613×104	4.48	β−(79), IT (21)	FP
827	105Ru	44	61	8.88974	1.598×104	4.44	β−	FP
828	80mBr	35	45	9.01886	1.591×104	4.42	IT
829	139Pr	59	80	8.68160	1.588×104	4.41	β+
830	129Sb	51	78	8.7274	1.584×104	4.40	β−	FP
831	109In	49	60	8.86480	1.497×104	4.16	β+
832	110Sn	50	60	8.8517	1.495×104	4.15	β+
833	71mZn	30	41	9.01739	1.493×104	4.15	β−
834	184Hf	72	112	8.2969	1.483×104	4.12	β−
835	149Tb	65	84	8.55111	1.482×104	4.12	β+(83), α (17)
836	44Sc	21	23	8.93077	1.455×104	4.04	β+
837	262Lr	103	159		1.44×104	4	β+, SF
838	141La	57	84	8.65947	1.411×104	3.92	β−	FP
839	133La	57	76	8.7141	1.408×104	3.91	β+
840	43Sc	21	22	8.91290	1.401×104	3.89	β+
841	193Hg	80	113	8.23226	1.368×104	3.80	β+
842	195mIr	77	118	8.23333	1.346×104	3.74	β−
843	176mLu	71	105	8.373929	1.319×104	3.66	β−, ε (0.1)
844	202mPb	82	120	8.18900	1.274×104	3.54	IT (90), β+(9.5)
845	92Y	39	53	8.99323	1.274×104	3.54	β−	FP
846	204Po	84	120	8.16122	1.267×104	3.52	β+(99), α (0.7)
847	132Ce	58	74	8.6961	1.264×104	3.51	β+
848	150Tb	65	85	8.54536	1.253×104	3.48	β+
849	117mCd	48	69	8.808771	1.239×104	3.44	β−	FP
850	61Cu	29	32	9.08745	1.203×104	3.34	β+
851	254Fm	100	154	7.752804	1.166×104	3.24	α, SF (0.06)
852	209Pb	82	127	8.155598	1.165×104	3.24	β−	DP
853	90mY	39	51	9.024817	1.161×104	3.23	IT, β−
854	250Bk	97	153	7.77951	1.156×104	3.21	β−
855	161Er	68	93	8.47629	1.156×104	3.21	β+
856	191Au	79	112	8.24827	1.145×104	3.18	β+
857	173Ta	73	100	8.3742	1.130×104	3.14	β+
858	112Ag	47	65	8.84439	1.127×104	3.13	β−
859	247Cf	98	149	7.80367	1.120×104	3.11	β+, α
860	167Ho	67	100	8.44425	1.116×104	3.1	β−
861	190mRe	75	115	8.25752	1.116×104	3.1	β−(54), IT (46)
862	184Ir	77	107	8.2866	1.112×104	3.09	β+
863	190m3Ir	77	113	8.262777	1.111×104	3.09	β+(91), IT (8.6)
864	45Ti	22	23	8.93821	1.109×104	3.08	β+
865	134mCs	55	79	8.718724	1.048×104	2.91	IT, ε (0.3)
866	197Tl	81	116	8.21525	1.022×104	2.84	β+
867	38S	16	22	8.7782	1.022×104	2.84	β−
868	88Kr	36	52	8.97690	1.017×104	2.83	β−	FP
869	87mSr	38	49	9.042485	1.010×104	2.81	IT, ε (0.3)
870	117Sb	51	66	8.82892	1.008×104	2.80	β+
871	224Ac	89	135	7.98099	1.001×104	2.78	β+(91), α (9.5)
872	93Tc	43	50	8.97031	9.90×103	2.75	β+
873	150Pm	61	89	8.5620	9.713×103	2.70	β−
874	85Y	39	46	8.9871	9.648×103	2.68	β+
875	31Si	14	17	8.811610	9.430×103	2.62	β−	CG
876	256Fm	100	156	7.73739	9.426×103	2.62	SF (92), α (8.1)
877	92Sr	38	54	8.97205	9.400×103	2.61	β−	FP
878	56Mn	25	31	9.087598	9.284×103	2.58	β−
879	65Ni	28	37	9.073254	9.063×103	2.52	β−
880	117Cd	48	69	8.809937	9.011×103	2.50	β−	FP
881	176W	74	102	8.3591	9.00×103	2.5	β+
882	239Cm	96	143		9.00×103	2.5	β+, α
883	116Te	52	64	8.8064	8.964×103	2.49	β+
884	141Nd	60	81	8.66842	8.964×103	2.49	β+
885	161Ho	67	94	8.48869	8.928×103	2.48	β+
886	210Rn	86	124	8.11706	8.640×103	2.40	α (96), β+(4)
887	198Pb	82	116	8.20297	8.640×103	2.4	β+
888	152Dy	66	86	8.53262	8.568×103	2.38	β+, α (0.1)	IM
889	83Br	35	48	9.02329	8.546×103	2.37	β−	FP
890	178Ta [d]	73	105		8.496×103	2.36	β+
891	187Pt	78	109	8.2675	8.460×103	2.35	β+
892	165Dy	66	99	8.456847	8.395×103	2.33	β−	IM
893	132I	53	79	8.72059	8.262×103	2.30	β−	FP
894	158Er	68	90	8.4846	8.24×103	2.29	β+
895	195Ir	77	118	8.233843	8.24×103	2.29	β−
896	66Ge	32	34	9.00476	8.136×103	2.26	β+
897	129Ba	56	73	8.73071	8.028×103	2.23	β+
898	250mEs [d]	99	151		7.99×103	2.22	β+
899	177W	74	103	8.3521	7.94×103	2.21	β+
900	238Cm	96	142	7.86357	7.92×103	2.2	β+(96), α (3.8), SF
901	106mRh	45	61	8.88482	7.86×103	2.18	β−
902	129mBa	56	73	8.73064	7.686×103	2.14	β+
903	138mPr	59	79	8.6712	7.632×103	2.12	β+
904	121I	53	68	8.78409	7.632×103	2.12	β+
905	127Sn	50	77	8.72856	7.560×103	2.10	β−	FP
906	123Xe	54	69	8.76439	7.488×103	2.08	β+
907	186Pt	78	108	8.2749	7.488×103	2.08	β+, α
908	245Am	95	150	7.818663	7.380×103	2.05	β−
909	89Nb [d]	41	48	8.9772	7.308×103	2.03	β+
910	117mIn	49	68	8.82882	6.972×103	1.94	β−(53), IT (47)	FP
911	186mIr	77	109	8.28191	6.912×103	1.92	β+(~75), IT (~25)
912	177Yb	70	107	8.359377	6.880×103	1.91	β−
913	198mTl	81	117	8.20761	6.732×103	1.87	β+(56), IT (44)
914	196Tl	81	115	8.21161	6.624×103	1.84	β+
915	83m2Kr	36	47	9.034560	6.588×103	1.83	IT	FP
916	18F	9	9	8.02281	6.584×103	1.83	β+	CG, IM
917	41Ar	18	23	8.877842	6.577×103	1.83	β−	CG
918	163Tm	69	94	8.45615	6.516×103	1.81	β+
919	207At	85	122	8.13522	6.516×103	1.81	β+(~90), α (~10)
920	239Pa	91	148		6.48×103	1.8	β−
921	224Rn	86	138	7.97112	6.420×103	1.78	β−
922	80Sr	38	42	8.95021	6.378×103	1.77	β+
923	181Os	76	105	8.3119	6.30×103	1.75	β+
924	205Po	84	121	8.15679	6.264×103	1.74	β+, α
925	149Nd	60	89	8.57048	6.221×103	1.73	β−	FP
926	202Bi	83	119	8.17405	6.19×103	1.72	β+
927	201Bi	83	118	8.17793	6.18×103	1.72	β+
928	249Es	99	150		6.132×103	1.70	β+(99), α (0.6)
929	87Zr	40	47	8.98335	6.048×103	1.68	β+
930	126Ba	56	70	8.72743	6.00×103	1.67	β+
931	113mIn	49	64	8.858711	5.968×103	1.66	IT
932	61Co	27	34	9.10244	5.936×103	1.65	β−
933	147Tb	65	82	8.55256	5.90×103	1.64	β+
934	238Am	95	143	7.8679	5.880×103	1.63	β+, α
935	208At	85	123	8.13127	5.868×103	1.63	β+(99), α (0.6)
936	133Ce	58	75	8.6910	5.82×103	1.62	β+
937	75Br	35	40	8.99274	5.80×103	1.61	β+
938	95Ru	44	51	8.9498	5.785×103	1.61	β+
939	259Md	101	158		5.76×103	1.60	SF
940	152m5Eu	63	89	8.549875	5.748×103	1.60	IT
941	197mPt	78	119	8.223706	5.725×103	1.59	IT (97), β−(3.3)
942	230Ra	88	142	7.92125	5.580×103	1.55	β−
943	142La	57	85	8.63487	5.466×103	1.52	β−	FP
944	78As	33	45	9.0049	5.442×103	1.51	β−	FP
945	199Pb	82	117	8.19811	5.40×103	1.5	β+
946	78Ge	32	46	8.99263	5.28×103	1.47	β−	FP
947	255Cf	98	157		5.10×103	1.42	β−
948	196mTl	81	115	8.20960	5.076×103	1.41	β+(96), IT (3.8)
949	196mIr	77	119	8.2204	5.040×103	1.40	β−
950	267Db	105	162		5.04×103	1.4 [n 1]	SF
951	132mI	53	79	8.71976	4.993×103	1.39	IT (86), β−(14)	FP
952	139Ba	56	83	8.682210	4.976×103	1.38	β−	FP
953	75Ge	32	43	9.029411	4.967×103	1.38	β−
954	120I	53	67	8.7692	4.900×103	1.36	β+
955	256Md	101	155		4.662×103	1.30	β+(91), α (9.2)
956	137Pr	59	78	8.67863	4.608×103	1.28	β+
957	87Kr	36	51	8.999014	4.578×103	1.27	β−	FP
958	164Yb	70	94	8.44334	4.548×103	1.26	β+
959	163Er	68	95	8.47112	4.500×103	1.25	β+
960	178Yb	70	108	8.35040	4.440×103	1.23	β−
961	237Am	95	142		4.416×103	1.23	β+, α
962	77Kr	36	41	8.98261	4.368×103	1.21	β+
963	142Sm	62	80	8.62753	4.349×103	1.21	β+
964	97Nb	41	56	8.95382	4.326×103	1.20	β−	FP
965	185Pt	78	107	8.2696	4.254×103	1.18	β+
966	195Tl	81	114	8.21570	4.176×103	1.16	β+
967	129Te	52	77	8.745775	4.176×103	1.16	β−	FP
968	104Ag	47	57	8.88974	4.152×103	1.15	β+
969	110mIn	49	61	8.8568	4.146×103	1.15	β+
970	174Ta	73	101	8.3687	4.104×103	1.14	β+
971	68Ga	31	37	9.05788	4.071×103	1.13	β+	IM
972	85mSr	38	47	9.02267	4.058×103	1.13	IT (87), β+(13)
973	190mIr	77	113	8.264621	4.032×103	1.12	IT
974	162mHo	67	95	8.47832	4.020×103	1.12	IT (62), β+(38)
975	204m2Pb	82	122	8.183690	4.016×103	1.12	IT
976	89mNb [d]	41	48		3.96×103	1.10	β+
977	103Ag	47	56	8.89465	3.942×103	1.10	β+
978	249Cm	96	153	7.787179	3.849×103	1.07	β−
979	229Ac	89	140	7.93730	3.762×103	1.05	β−
980	117Te	52	65	8.7986	3.720×103	1.03	β+
981	240Np	93	147	7.85333	3.714×103	1.03	β−
982	182mHf	72	110	8.31790	3.69×103	1.03	β−(54), IT (46)
983	183Hf	72	111	8.3078	3.665×103	1.02	β−
984	212Bi	83	129	8.109610	3.633×103	1.01	β−(64), α (36)	DP
985	116m2Sb	51	65	8.8165	3.618×103	1.01	β+
986	148Tb	65	83	8.54792	3.60×103	1.00	β+
987	270Db	105	165		3.6×103	1.0 [n 1]	α (~87), SF (~13)

1. 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.

Main article: List of radioactive nuclides by half-life

See also

• Isotope geochemistry
• List of elements by stability of isotopes
• List of radioactive nuclides by half-life
• Monoisotopic element
• Mononuclidic element
• Primordial nuclide
• Radionuclide
• Stable nuclide
• Table of nuclides

Notes

1. Two further nuclides, plutonium-244 and samarium-146, have half-lives just long enough (8.13×10⁷ and 9.20×10⁷ years ^[1] ) 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 ]}
2. 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.
3. 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
4. Uncertain whether this nuclide is the ground state of its isotope.

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External links

• National Nuclear Data Center, Brookhaven National Laboratory
• IAEA Chart of Nuclides
• 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
• Discovery of Nuclides Project main page, does not (yet) include isomers
  • Index to all isotopes
  • Index to all isomers