Isotopes of radon

Isotopes of radon (₈₆Rn)
α	207Po
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Last updated November 20, 2024

There are 39 known isotopes of radon (₈₆Rn), from ¹⁹³Rn to ²³¹Rn; all are radioactive. The most stable isotope is ²²²Rn with a half-life of 3.8235 days, which decays into ²¹⁸
Po . Six isotopes of radon, ^{217, 218, 219, 220, 221, 222}Rn, occur in trace quantities in nature as decay products of, respectively, ²¹⁷At, ²¹⁸At, ²²³Ra, ²²⁴Ra, ²²⁵Ra, and ²²⁶Ra. ²¹⁷Rn and ²²¹Rn are produced in rare branches in the decay chain of trace quantities of ²³⁷Np; ²²²Rn (and also ²¹⁸Rn in a rare branch) is an intermediate step in the decay chain of ²³⁸U;^[2]²¹⁹Rn is an intermediate step in the decay chain of ²³⁵U; and ²²⁰Rn occurs in the decay chain of ²³²Th.

List of isotopes

Nuclide ^{[n 1]}	Historic name	Z	N	Isotopic mass (Da)^[3] ^{[n 2]}^{[n 3]}	Half-life	Decay mode	Daughter isotope	Spin and parity ^{[n 4]}^{[n 5]}	Isotopic abundance
Nuclide ^{[n 1]}	Historic name	Excitation energy^{[n 5]}			Half-life	Decay mode	Daughter isotope	Spin and parity ^{[n 4]}^{[n 5]}	Isotopic abundance
¹⁹³Rn		86	107	193.009708(27)	1.15(27) ms	α	¹⁸⁹Po	(3/2−)
¹⁹⁴Rn		86	108	194.006146(18)	0.78(16) ms	α	¹⁹⁰Po	0+
¹⁹⁴Rn		86	108	194.006146(18)	0.78(16) ms	β⁺?	¹⁹⁴At	0+
¹⁹⁵Rn		86	109	195.005422(55)	7(3) ms	α	¹⁹¹Po	3/2−
^195mRn^{[n 6]}		80(50) keV			6(3) ms	α	¹⁹¹Po	13/2+
¹⁹⁶Rn		86	110	196.002120(15)	4.7(11) ms	α	¹⁹²Po	0+
¹⁹⁶Rn		86	110	196.002120(15)	4.7(11) ms	β⁺?	¹⁹⁶At	0+
¹⁹⁷Rn		86	111	197.001621(17)	54(6) ms	α	¹⁹³Po	3/2−
¹⁹⁷Rn		86	111	197.001621(17)	54(6) ms	β⁺?	¹⁹⁷At	3/2−
^197mRn		199(11) keV			25.6(25) ms	α	¹⁹³Po	13/2+
^197mRn		199(11) keV			25.6(25) ms	β⁺?	¹⁹⁷At	13/2+
¹⁹⁸Rn		86	112	197.998679(14)	64.4(16) ms	α (93%)	¹⁹⁴Po	0+
¹⁹⁸Rn		86	112	197.998679(14)	64.4(16) ms	β⁺? (7%)	¹⁹⁸At	0+
¹⁹⁹Rn		86	113	198.9983254(78)	590(30) ms	α	¹⁹⁵Po	3/2−
¹⁹⁹Rn		86	113	198.9983254(78)	590(30) ms	β⁺?	¹⁹⁹At	3/2−
^199mRn		220(11) keV			310(20) ms	α	¹⁹⁵Po	13/2+
						β⁺?	¹⁹⁹At
						IT?	¹⁹⁹At
²⁰⁰Rn		86	114	199.9957053(62)	1.09(16) s	α (92%)	¹⁹⁶Po	0+
²⁰⁰Rn		86	114	199.9957053(62)	1.09(16) s	β⁺? (8%)	²⁰⁰At	0+
^200mRn		2320(20)# keV			28(9) μs	IT	²⁰⁰Rn
²⁰¹Rn		86	115	200.995591(11)	7.0(4) s	α	¹⁹⁷Po	3/2−
²⁰¹Rn		86	115	200.995591(11)	7.0(4) s	β⁺?	²⁰¹At	3/2−
^201mRn		245(12) keV			3.8(1) s	α	¹⁹⁷Po	13/2+
^201mRn		245(12) keV			3.8(1) s	β⁺?	²⁰¹At	13/2+
²⁰²Rn		86	116	201.993264(19)	9.7(1) s	α (78%)	¹⁹⁸Po	0+
²⁰²Rn		86	116	201.993264(19)	9.7(1) s	β⁺ (22%)	²⁰²At	0+
^202mRn		2310(50)# keV			2.22(7) μs	IT	²⁰²Rn	11−#
²⁰³Rn		86	117	202.9933612(62)	44.2(16) s	α (66%)	¹⁹⁹Po	3/2−
²⁰³Rn		86	117	202.9933612(62)	44.2(16) s	β⁺ (34%)	²⁰³At	3/2−
^203mRn		362(4) keV			26.9(5) s	α (75%)	¹⁹⁹Po	13/2+
^203mRn		362(4) keV			26.9(5) s	β⁺ (25%)	²⁰³At	13/2+
²⁰⁴Rn		86	118	203.9914437(80)	1.242(23) min	α (72.4%)	²⁰⁰Po	0+
²⁰⁴Rn		86	118	203.9914437(80)	1.242(23) min	β⁺ (27.6%)	²⁰⁴At	0+
²⁰⁵Rn		86	119	204.9917232(55)	170(4) s	β⁺ (75.4%)	²⁰⁵At	5/2−
²⁰⁵Rn		86	119	204.9917232(55)	170(4) s	α (24.6%)	²⁰¹Po	5/2−
^205mRn		657.1(5) keV			>10 s	IT	²⁰⁵Rn	13/2+#
						α?	²⁰¹Po
						β⁺?	²⁰⁵At
²⁰⁶Rn		86	120	205.9901954(92)	5.67(17) min	α (62%)	²⁰²Po	0+
²⁰⁶Rn		86	120	205.9901954(92)	5.67(17) min	β⁺ (38%)	²⁰⁶At	0+
²⁰⁷Rn		86	121	206.9907302(51)	9.25(17) min	β⁺ (79%)	²⁰⁷At	5/2−
²⁰⁷Rn		86	121	206.9907302(51)	9.25(17) min	α (21%)	²⁰³Po	5/2−
^207mRn		899.1(10) keV			184.5(9) μs	IT	²⁰⁷Rn	13/2+
²⁰⁸Rn		86	122	207.989635(11)	24.35(14) min	α (62%)	²⁰⁴Po	0+
²⁰⁸Rn		86	122	207.989635(11)	24.35(14) min	β⁺ (38%)	²⁰⁸At	0+
^208mRn		1828.3(4) keV			487(12) ns	IT	²⁰⁸Rn	8+
²⁰⁹Rn		86	123	208.990401(11)	28.8(10) min	β⁺ (83%)	²⁰⁹At	5/2−
²⁰⁹Rn		86	123	208.990401(11)	28.8(10) min	α (17%)	²⁰⁵Po	5/2−
^209m1Rn		1174.01(13) keV			13.4(13) μs	IT	²⁰⁹Rn	13/2+
^209m2Rn		3636.81(23) keV			3.0(3) μs	²⁰⁹Rn	IT	35/2+
²¹⁰Rn		86	124	209.9896889(49)	2.4(1) h	α (96%)	²⁰⁶Po	0+
²¹⁰Rn		86	124	209.9896889(49)	2.4(1) h	β⁺ (4%)	²¹⁰At	0+
^210m1Rn		1710(30) keV			644(40) ns	IT	²¹⁰Rn	8+
^210m2Rn		3857(30) keV			1.06(5) μs	IT	²¹⁰Rn	17−
^210m3Rn		6514(30) keV			1.04(7) μs	IT	²¹⁰Rn	23+
²¹¹Rn		86	125	210.9906008(73)	14.6(2) h	β⁺ (72.6%)	²¹¹At	1/2−
²¹¹Rn		86	125	210.9906008(73)	14.6(2) h	α (27.4%)	²⁰⁷Po	1/2−
^211m1Rn		1603(14)# keV			596(28) ns	IT	²¹¹Rn	17/2−
^211m2Rn		8905(20)# keV			201(4) ns	IT	²¹⁰Rn	63/2−
²¹²Rn		86	126	211.9907039(33)	23.9(12) min	α	²⁰⁸Po	0+
^212m1Rn		1639.68(15) keV			118(14) ns	IT	²¹²Rn	6+
^212m2Rn		1694.1(3) keV			910(30) ns	IT	²¹²Rn	8+
^212m3Rn		6174.2(3) keV			102(4) ns	IT	²¹²Rn	22+
^212m4Rn		8579.2(4) keV			154(14) ns	IT	²¹²Rn	30+
²¹³Rn		86	127	212.9938851(36)	19.5(1) ms	α^{[n 7]}	²⁰⁹Po	9/2+#
^213m1Rn		1682(10) keV			1.00(21) μs	IT	²¹³Rn	(25/2+)
^213m2Rn		2205(10) keV			1.36(7) μs	IT	²¹³Rn	(31/2−)
^213m3Rn		5965(14) keV			164(11) ns	IT	²¹³Rn	(55/2+)
²¹⁴Rn		86	128	213.9953627(99)	259(3) ns	α	²¹⁰Po	0+
^214mRn		4595.4(18) keV			245(30) ns	IT	²¹⁴Rn	(22+)
²¹⁵Rn		86	129	214.9987450(65)	2.30(10) μs	α	²¹¹Po	9/2+
²¹⁶Rn		86	130	216.0002719(62)	29(4) μs	α	²¹²Po	0+
²¹⁷Rn		86	131	217.0039276(45)	593(38) μs	α	²¹³Po	9/2+	Trace^{[n 8]}
²¹⁸Rn		86	132	218.0056011(25)	33.75(15) ms	α	²¹⁴Po	0+	Trace^{[n 9]}
²¹⁹Rn	Actinon Actinium emanation	86	133	219.0094787(23)	3.96(1) s	α	²¹⁵Po	5/2+	Trace^{[n 10]}
²²⁰Rn	Thoron Thorium emanation	86	134	220.0113924(19)	55.6(1) s	α^{[n 11]}	²¹⁶Po	0+	Trace^{[n 12]}
²²¹Rn		86	135	221.0155356(61)	25.7(5) min	β⁻ (78%)	²²¹Fr	7/2+	Trace^{[n 8]}
²²¹Rn		86	135	221.0155356(61)	25.7(5) min	α (22%)	²¹⁷Po	7/2+	Trace^{[n 8]}
²²²Rn	Radon^{[n 13]} Radium emanation Emanation Emanon Niton	86	136	222.0175760(21)	3.8215(2) d	α^{[n 14]}	²¹⁸Po	0+	Trace^{[n 9]}
²²³Rn		86	137	223.0218893(84)	24.3(4) min	β⁻	²²³Fr	7/2+
²²³Rn		86	137	223.0218893(84)	24.3(4) min	α?	²¹⁹Po	7/2+
²²⁴Rn		86	138	224.024096(11)	107(3) min	β⁻	²²⁴Fr	0+
²²⁵Rn		86	139	225.028486(12)	4.66(4) min	β⁻	²²⁵Fr	7/2−
²²⁶Rn		86	140	226.030861(11)	7.4(1) min	β⁻	²²⁶Fr	0+
²²⁷Rn		86	141	227.035304(15)	20.2(4) s	β⁻	²²⁷Fr	(3/2+)
²²⁸Rn		86	142	228.037835(19)	65(2) s	β⁻	²²⁸Fr	0+
²²⁹Rn		86	143	229.042257(14)	11.9(13) s	β⁻	²²⁹Fr	(5/2+)
²³⁰Rn		86	144	230.04527(22)#	24# [>300 ns]	β⁻?	²³⁰Fr	0+
²³¹Rn		86	145	231.04997(32)#	2# s [>300 ns]	β⁻?	²³¹Fr	1/2+#
This table header & footer: view

↑ ^mRn – Excited nuclear isomer.
↑ ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
↑ # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
↑ ( ) spin value – Indicates spin with weak assignment arguments.
1 2 # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
↑ Order of ground state and isomer is uncertain.
↑ Theoretically capable of electron capture to ²¹³At^[4]
1 2 Intermediate decay product of ²³⁷Np
1 2 Intermediate decay product of ²³⁸U
↑ Intermediate decay product of ²³⁵U
↑ Theorized to also undergo β⁻β⁻ decay to ²²⁰Ra
↑ Intermediate decay product of ²³²Th
↑ Source of element's name
↑ Theorized to also undergo β⁻ decay to ²²²Fr^[5] and β⁻β⁻ decay to ²²²Ra

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References

↑ 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.
↑ "Decay Chain".
↑ Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C. 45 (3): 030003. doi:10.1088/1674-1137/abddaf.
↑ "Adopted Levels for ²¹³Rn" (PDF). NNDC Chart of Nuclides.
↑ Belli, P.; Bernabei, R.; Cappella, C.; Caracciolo, V.; Cerulli, R.; Danevich, F.A.; Di Marco, A.; Incicchitti, A.; Poda, D.V.; Polischuk, O.G.; Tretyak, V.I. (2014). "Investigation of rare nuclear decays with BaF₂ crystal scintillator contaminated by radium". European Physical Journal A. 50 (9): 134–143. arXiv: 1407.5844 . Bibcode:2014EPJA...50..134B. doi:10.1140/epja/i2014-14134-6. S2CID 118513731.

Isotope masses from:
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
Half-life, spin, and isomer data selected from the following sources.
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
- National Nuclear Data Center. "NuDat 2.x database". Brookhaven National Laboratory.
- Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.). CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. ISBN 978-0-8493-0485-9.

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[3] Rn – Excited nuclear isomer.

[5] ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.

[TMS-6] # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).

[7] ( ) spin value – Indicates spin with weak assignment arguments.

[TNN-8] 1 2 # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).

[order-9] Order of ground state and isomer is uncertain.

[11] Theoretically capable of electron capture to ²¹³At^[4]

[ns-12] 1 2 Intermediate decay product of ²³⁷Np

[us-13] 1 2 Intermediate decay product of ²³⁸U

[14] Intermediate decay product of ²³⁵U

[15] Theorized to also undergo β⁻β⁻ decay to ²²⁰Ra

[16] Intermediate decay product of ²³²Th

[17] Source of element's name

[19] Theorized to also undergo β⁻ decay to ²²²Fr^[5] and β⁻β⁻ decay to ²²²Ra

[NUBASE2020-1] 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.

[2] "Decay Chain".

[AME2020_II-4] Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C. 45 (3): 030003. doi:10.1088/1674-1137/abddaf.

[10] "Adopted Levels for ²¹³Rn" (PDF). NNDC Chart of Nuclides.

[BelliBaF2-18] Belli, P.; Bernabei, R.; Cappella, C.; Caracciolo, V.; Cerulli, R.; Danevich, F.A.; Di Marco, A.; Incicchitti, A.; Poda, D.V.; Polischuk, O.G.; Tretyak, V.I. (2014). "Investigation of rare nuclear decays with BaF₂ crystal scintillator contaminated by radium". European Physical Journal A. 50 (9): 134–143. arXiv: 1407.5844 . Bibcode:2014EPJA...50..134B. doi:10.1140/epja/i2014-14134-6. S2CID 118513731.

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