Isotopes of tin

Isotopes of tin (₅₀Sn)
Standard atomic weight Ar°(Sn)
	118.710±0.007; 118.71±0.01 (abridged);
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Tin (₅₀Sn) is the element with the greatest number of stable isotopes (ten; three of them are potentially radioactive but have not been observed to decay). This is probably related to the fact that 50 is a "magic number" of protons. In addition, twenty-nine unstable tin isotopes are known, including tin-100 (¹⁰⁰Sn) (discovered in 1994)^[4] and tin-132 (¹³²Sn), which are both "doubly magic". The longest-lived tin radioisotope is tin-126 (¹²⁶Sn), with a half-life of 230,000 years. The other 28 radioisotopes have half-lives of less than a year.

List of isotopes

Nuclide ^{[n 1]}	Z	N	Isotopic mass (Da)^[5] ^{[n 2]}^{[n 3]}	Half-life^[1] ^{[n 4]}	Decay mode^[1] ^{[n 5]}	Daughter isotope ^{[n 6]}	Spin and parity^[1] ^{[n 7]}^{[n 4]}	Natural abundance (mole fraction)
Nuclide ^{[n 1]}	Excitation energy^{[n 4]}			Half-life^[1] ^{[n 4]}	Decay mode^[1] ^{[n 5]}	Daughter isotope ^{[n 6]}	Spin and parity^[1] ^{[n 7]}^{[n 4]}	Normal proportion^[1]	Range of variation
⁹⁹Sn^{[n 8]}	50	49	98.94850(63)#	24(4) ms	β⁺ (95%)	⁹⁹In	9/2+#
⁹⁹Sn^{[n 8]}	50	49	98.94850(63)#	24(4) ms	β⁺, p (5%)	⁹⁸Cd	9/2+#
¹⁰⁰Sn	50	50	99.93865(26)	1.18(8) s	β⁺ (>83%)	¹⁰⁰In	0+
¹⁰⁰Sn	50	50	99.93865(26)	1.18(8) s	β⁺, p (<17%)	⁹⁹Cd	0+
¹⁰¹Sn	50	51	100.93526(32)	2.22(5) s	β⁺	¹⁰¹In	(7/2+)
¹⁰¹Sn	50	51	100.93526(32)	2.22(5) s	β⁺, p?	¹⁰⁰Cd	(7/2+)
¹⁰²Sn	50	52	101.93029(11)	3.8(2) s	β⁺	¹⁰²In	0+
^102mSn	2017(2) keV			367(8) ns	IT	¹⁰²Sn	(6+)
¹⁰³Sn	50	53	102.92797(11)#	7.0(2) s	β⁺ (98.8%)	¹⁰³In	5/2+#
¹⁰³Sn	50	53	102.92797(11)#	7.0(2) s	β⁺, p (1.2%)	¹⁰²Cd	5/2+#
¹⁰⁴Sn	50	54	103.923105(6)	20.8(5) s	β⁺	¹⁰⁴In	0+
¹⁰⁵Sn	50	55	104.921268(4)	32.7(5) s	β⁺	¹⁰⁵In	(5/2+)
¹⁰⁵Sn	50	55	104.921268(4)	32.7(5) s	β⁺, p (0.011%)	¹⁰⁴Cd	(5/2+)
¹⁰⁶Sn	50	56	105.916957(5)	1.92(8) min	β⁺	¹⁰⁶In	0+
¹⁰⁷Sn	50	57	106.915714(6)	2.90(5) min	β⁺	¹⁰⁷In	(5/2+)
¹⁰⁸Sn	50	58	107.911894(6)	10.30(8) min	β⁺	¹⁰⁸In	0+
¹⁰⁹Sn	50	59	108.911293(9)	18.1(2) min	β⁺	¹⁰⁹In	5/2+
¹¹⁰Sn	50	60	109.907845(15)	4.154(4) h	EC	¹¹⁰In	0+
¹¹¹Sn	50	61	110.907741(6)	35.3(6) min	β⁺	¹¹¹In	7/2+
^111mSn	254.71(4) keV			12.5(10) μs	IT	¹¹¹Sn	1/2+
¹¹²Sn	50	62	111.9048249(3)	Observationally Stable^{[n 9]}			0+	0.0097(1)
¹¹³Sn	50	63	112.9051759(17)	115.08(4) d	β⁺	¹¹³In	1/2+
^113mSn	77.389(19) keV			21.4(4) min	IT (91.1%)	¹¹³Sn	7/2+
^113mSn	77.389(19) keV			21.4(4) min	β⁺ (8.9%)	¹¹³In	7/2+
¹¹⁴Sn	50	64	113.90278013(3)	Stable			0+	0.0066(1)
^114mSn	3087.37(7) keV			733(14) ns	IT	¹¹⁴Sn	7−
¹¹⁵Sn	50	65	114.903344695(16)	Stable			1/2+	0.0034(1)
^115m1Sn	612.81(4) keV			3.26(8) μs	IT	¹¹⁵Sn	7/2+
^115m2Sn	713.64(12) keV			159(1) μs	IT	¹¹⁵Sn	11/2−
¹¹⁶Sn	50	66	115.90174283(10)	Stable			0+	0.1454(9)
^116m1Sn	2365.975(21) keV			348(19) ns	IT	¹¹⁶Sn	5−
^116m2Sn	3547.16(17) keV			833(30) ns	IT	¹¹⁶Sn	10+
¹¹⁷Sn	50	67	116.90295404(52)	Stable			1/2+	0.0768(7)
^117m1Sn	314.58(4) keV			13.939(24) d	IT	¹¹⁷Sn	11/2−
^117m2Sn	2406.4(4) keV			1.75(7) μs	IT	¹¹⁷Sn	(19/2+)
¹¹⁸Sn	50	68	117.90160663(54)	Stable			0+	0.2422(9)
^118m1Sn	2574.91(4) keV			230(10) ns	IT	¹¹⁸Sn	7−
^118m2Sn	3108.06(22) keV			2.52(6) μs	IT	¹¹⁸Sn	(10+)
¹¹⁹Sn	50	69	118.90331127(78)	Stable			1/2+	0.0859(4)
^119m1Sn	89.531(13) keV			293.1(7) d	IT	¹¹⁹Sn	11/2−
^119m2Sn	2127.0(10) keV			9.6(12) μs	IT	¹¹⁹Sn	(19/2+)
^119m3Sn	2369.0(3) keV			96(9) ns	IT	¹¹⁹Sn	23/2+
¹²⁰Sn	50	70	119.90220256(99)	Stable			0+	0.3258(9)
^120m1Sn	2481.63(6) keV			11.8(5) μs	IT	¹²⁰Sn	7−
^120m2Sn	2902.22(22) keV			6.26(11) μs	IT	¹²⁰Sn	10+
¹²¹Sn^{[n 10]}	50	71	120.9042435(11)	27.03(4) h	β⁻	¹²¹Sb	3/2+
^121m1Sn	6.31(6) keV			43.9(5) y	IT (77.6%)	¹²¹Sn	11/2−
^121m1Sn	6.31(6) keV			43.9(5) y	β⁻ (22.4%)	¹²¹Sb	11/2−
^121m2Sn	1998.68(13) keV			5.3(5) μs	IT	¹²¹Sn	19/2+
^121m3Sn	2222.0(2) keV			520(50) ns	IT	¹²¹Sn	23/2+
^121m4Sn	2833.9(2) keV			167(25) ns	IT	¹²¹Sn	27/2−
¹²²Sn^{[n 10]}	50	72	121.9034455(26)	Observationally Stable^{[n 11]}			0+	0.0463(3)
^122m1Sn	2409.03(4) keV			7.5(9) μs	IT	¹²²Sn	7−
^122m2Sn	2765.5(3) keV			62(3) μs	IT	¹²²Sn	10+
^122m3Sn	4721.2(3) keV			139(9) ns	IT	¹²²Sn	15−
¹²³Sn^{[n 10]}	50	73	122.9057271(27)	129.2(4) d	β⁻	¹²³Sb	11/2−
^123m1Sn	24.6(4) keV			40.06(1) min	β⁻	¹²³Sb	3/2+
^123m2Sn	1944.90(12) keV			7.4(26) μs	IT	¹²³Sn	19/2+
^123m3Sn	2152.66(19) keV			6 μs	IT	¹²³Sn	23/2+
^123m4Sn	2712.47(21) keV			34 μs	IT	¹²³Sn	27/2−
¹²⁴Sn^{[n 10]}	50	74	123.9052796(14)	Observationally Stable^{[n 12]}			0+	0.0579(5)
^124m1Sn	2204.620(23) keV			270(60) ns	IT	¹²⁴Sn	5-
^124m2Sn	2324.96(4) keV			3.1(5) μs	IT	¹²⁴Sn	7−
^124m3Sn	2656.6(3) keV			51(3) μs	IT	¹²⁴Sn	10+
^124m4Sn	4552.4(3) keV			260(25) ns	IT	¹²⁴Sn	15−
¹²⁵Sn^{[n 10]}	50	75	124.9077894(14)	9.634(15) d	β⁻	¹²⁵Sb	11/2−
^125m1Sn	27.50(14) keV			9.77(25) min	β⁻	¹²⁵Sb	3/2+
^125m2Sn	1892.8(3) keV			6.2(2) μs	IT	¹²⁵Sn	19/2+
^125m3Sn	2059.5(4) keV			650(60) ns	IT	¹²⁵Sn	23/2+
^125m4Sn	2623.5(5) keV			230(17) ns	IT	¹²⁵Sn	27/2−
¹²⁶Sn^{[n 13]}	50	76	125.907658(11)	2.30(14)×10⁵ y	β⁻	¹²⁶Sb	0+	< 10⁻¹⁴^[6]
^126m1Sn	2218.99(8) keV			6.1(7) μs	IT	¹²⁶Sn	7−
^126m2Sn	2564.5(5) keV			7.6(3) μs	IT	¹²⁶Sn	10+
^126m3Sn	4347.4(4) keV			114(2) ns	IT	¹²⁶Sn	15−
¹²⁷Sn	50	77	126.9103917(99)	2.10(4) h	β⁻	¹²⁷Sb	11/2−
^127m1Sn	5.07(6) keV			4.13(3) min	β⁻	¹²⁷Sb	3/2+
^127m2Sn	1826.67(16) keV			4.52(15) μs	IT	¹²⁷Sn	19/2+
^127m3Sn	1930.97(17) keV			1.26(15) μs	IT	¹²⁷Sn	(23/2+)
^127m4Sn	2552.4(10) keV			250 ns (30) ns	IT	¹²⁷Sn	(27/2−)
¹²⁸Sn	50	78	127.910508(19)	59.07(14) min	β⁻	¹²⁸Sb	0+
^128m1Sn	2091.50(11) keV			6.5(5) s	IT	¹²⁸Sn	7−
^128m2Sn	2491.91(17) keV			2.91(14) μs	IT	¹²⁸Sn	10+
^128m3Sn	4099.5(4) keV			220(30) ns	IT	¹²⁸Sn	(15−)
¹²⁹Sn	50	79	128.913482(19)	2.23(4) min	β⁻	¹²⁹Sb	3/2+
^129m1Sn	35.15(5) keV			6.9(1) min	β⁻	¹²⁹Sb	11/2−
^129m2Sn	1761.6(10) keV			3.49(11) μs	IT	¹²⁹Sn	(19/2+)
^129m3Sn	1802.6(10) keV			2.22(13) μs	IT	¹²⁹Sn	23/2+
^129m4Sn	2552.9(11) keV			221(18) ns	IT	¹²⁹Sn	(27/2−)
¹³⁰Sn	50	80	129.9139745(20)	3.72(7) min	β⁻	¹³⁰Sb	0+
^130m1Sn	1946.88(10) keV			1.7(1) min	β⁻	¹³⁰Sb	7−
^130m2Sn	2434.79(12) keV			1.501(17) μs	IT	¹³⁰Sn	(10+)
¹³¹Sn	50	81	130.917053(4)	56.0(5) s	β⁻	¹³¹Sb	3/2+
^131m1Sn	65.1(3) keV			58.4(5) s	β⁻	¹³¹Sb	11/2−
^131m1Sn	65.1(3) keV			58.4(5) s	IT?	¹³¹Sn	11/2−
^131m2Sn	4670.0(4) keV			316(5) ns	IT	¹³¹Sn	(23/2−)
¹³²Sn	50	82	131.9178239(21)	39.7(8) s	β⁻	¹³²Sb	0+
^132mSn	4848.52(20) keV			2.080(16) μs	IT	¹³²Sn	8+
¹³³Sn	50	83	132.9239138(20)	1.37(7) s	β⁻ (99.97%)	¹³³Sb	7/2−
¹³³Sn	50	83	132.9239138(20)	1.37(7) s	β⁻, n (.0294%)	¹³²Sb	7/2−
¹³⁴Sn	50	84	133.928680(3)	0.93(8) s	β⁻ (83%)	¹³⁴Sb	0+
¹³⁴Sn	50	84	133.928680(3)	0.93(8) s	β⁻, n (17%)	¹³³Sb	0+
^134mSn	1247.4(5) keV			87(8) ns	IT	¹³²Sn	6+
¹³⁵Sn	50	85	134.934909(3)	515(5) ms	β⁻ (79%)	¹³⁵Sb	7/2−#
					β⁻, n (21%)	¹³⁴Sb
					β⁻, 2n?	¹³³Sb
¹³⁶Sn	50	86	135.93970(22)#	355(18) ms	β⁻ (72%)	¹³⁶Sb	0+
					β⁻, n (28%)	¹³⁵Sb
					β⁻, 2n?	¹³⁴Sb
¹³⁷Sn	50	87	136.94616(32)#	249(15) ms	β⁻ (52%)	¹³⁷Sb	5/2−#
					β⁻, n (48%)	¹³⁶Sb
					β⁻, 2n?	¹³⁵Sb
¹³⁸Sn	50	88	137.95114(43)#	148(9) ms	β⁻ (64%)	¹³⁸Sb	0+
					β⁻, n (36%)	¹³⁷Sb
					β⁻, 2n?	¹³⁶Sb
^138mSn	1344(2) keV			210(45) ns	IT	¹³⁸Sn	(6+)
¹³⁹Sn	50	89	138.95780(43)#	120(38) ms	β⁻	¹³⁹Sb	5/2−#
					β⁻, n?	¹³⁸Sb
					β⁻, 2n?	¹³⁷Sb
¹⁴⁰Sn	50	90	139.96297(32)#	50# ms [>550 ns]	β⁻?	¹⁴⁰Sb	0+
					β⁻, n?	¹³⁹Sb
					β⁻, 2n?	¹³⁸Sb
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Tin-117m

Tin-117m is a radioisotope of tin. One of its uses is in a particulate suspension to treat canine synovitis (radiosynoviorthesis).^[7]

Tin-121m

Tin-121m (^121mSn) is a radioisotope and nuclear isomer of tin with a half-life of 43.9 years.

In a normal thermal reactor, it has a very low fission product yield; thus, this isotope is not a significant contributor to nuclear waste. Fast fission or fission of some heavier actinides will produce tin-121 at higher yields. For example, its yield from uranium-235 is 0.0007% per thermal fission and 0.002% per fast fission.^[8]

Tin-126

Yield, % per fission^[8]
	Thermal	Fast	14 MeV
²³²Th	not fissile	0.0481 ± 0.0077	0.87 ± 0.20
²³³U	0.224 ± 0.018	0.278 ± 0.022	1.92 ± 0.31
²³⁵U	0.056 ± 0.004	0.0137 ± 0.001	1.70 ± 0.14
²³⁸U	not fissile	0.054 ± 0.004	1.31 ± 0.21
²³⁹Pu	0.199 ± 0.016	0.26 ± 0.02	2.02 ± 0.22
²⁴¹Pu	0.082 ± 0.019	0.22 ± 0.03	?

Tin-126 is a radioisotope of tin and one of the only seven long-lived fission products of uranium and plutonium. While tin-126's half-life of 230,000 years translates to a low specific activity of gamma radiation, its short-lived decay products, two isomers of antimony-126, emit 17 and 40 keV gamma radiation and a 3.67 MeV beta particle on their way to stable tellurium-126, making external exposure to tin-126 a potential concern.

Tin-126 is in the middle of the mass range for fission products. Thermal reactors, which make up almost all current nuclear power plants, produce it at a very low yield (0.056% for ²³⁵U), since slow neutrons almost always fission ²³⁵U or ²³⁹Pu into unequal halves. Fast fission in a fast reactor or nuclear weapon, or fission of some heavy minor actinides such as californium, will produce it at higher yields.

ANL factsheet

References

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
Isotopic compositions and standard atomic masses from:
- de Laeter, John Robert; Böhlke, John Karl; De Bièvre, Paul; Hidaka, Hiroshi; Peiser, H. Steffen; Rosman, Kevin J. R.; Taylor, Philip D. P. (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry. 75 (6): 683–800. doi:10.1351/pac200375060683.
- Wieser, Michael E. (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry. 78 (11): 2051–2066. doi:10.1351/pac200678112051.
"News & Notices: Standard Atomic Weights Revised". International Union of Pure and Applied Chemistry. 19 October 2005.
Half-life, spin, and isomer data selected 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
- 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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