Isotopes of tin

Tin (Sn) is the element with the greatest number of stable isotopes (ten; three of them are potentially radioactive but have not been observed to decay), which is probably related to the fact that 50 is a "magic number" of protons. 29 additional unstable isotopes are known, including the "doubly magic" tin-100 (¹⁰⁰Sn) (discovered in 1994)^[1] and tin-132 (¹³²Sn). The longest-lived radioisotope is ¹²⁶Sn, with a half-life of 230,000 years. The other 28 radioisotopes have half-lives less than a year.

Relative atomic mass: 118.74.

Tin-121m

Tin-121m 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 ^121mSn at higher yields. For example, its yield from U-235 is 0.0007% per thermal fission and 0.002% per fast fission.^[2]

Tin-126

Yield, % per fission^[2]
	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 only 7 long-lived fission products. While tin-126's halflife of 230,000 years translates to a low specific activity that limits its radioactive hazard, its short-lived decay product, antimony-126, emits high-energy gamma radiation, making external exposure to tin-126 a potential concern.

¹²⁶Sn 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 like californium, will produce it at higher yields.

ANL factsheet^{[dead link]}

Table

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life	decay mode(s)^[3]^{[n 1]}	daughter isotope(s)^{[n 2]}	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
nuclide symbol	excitation energy			half-life	decay mode(s)^[3]^{[n 1]}	daughter isotope(s)^{[n 2]}	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
⁹⁹Sn^{[n 3]}	50	49	98.94933(64)#	5# ms			9/2+#
¹⁰⁰Sn^{[n 4]}	50	50	99.93904(76)	1.1(4) s [0.94(+54−27) s]	β⁺ (83%)	¹⁰⁰In	0+
¹⁰⁰Sn^{[n 4]}	50	50	99.93904(76)	1.1(4) s [0.94(+54−27) s]	β⁺, p (17%)	⁹⁹Cd	0+
¹⁰¹Sn	50	51	100.93606(32)#	3(1) s	β⁺	¹⁰¹In	5/2+#
¹⁰¹Sn	50	51	100.93606(32)#	3(1) s	β⁺, p (rare)	¹⁰⁰Cd	5/2+#
¹⁰²Sn	50	52	101.93030(14)	4.5(7) s	β⁺	¹⁰²In	0+
¹⁰²Sn	50	52	101.93030(14)	4.5(7) s	β⁺, p (rare)	¹⁰¹Cd	0+
^102mSn	2017(2) keV			720(220) ns			(6+)
¹⁰³Sn	50	53	102.92810(32)#	7.0(6) s	β⁺	¹⁰³In	5/2+#
¹⁰³Sn	50	53	102.92810(32)#	7.0(6) s	β⁺, p (rare)	¹⁰²Cd	5/2+#
¹⁰⁴Sn	50	54	103.92314(11)	20.8(5) s	β⁺	¹⁰⁴In	0+
¹⁰⁵Sn	50	55	104.92135(9)	34(1) s	β⁺	¹⁰⁵In	(5/2+)
¹⁰⁵Sn	50	55	104.92135(9)	34(1) s	β⁺, p (rare)	¹⁰⁴Cd	(5/2+)
¹⁰⁶Sn	50	56	105.91688(5)	115(5) s	β⁺	¹⁰⁶In	0+
¹⁰⁷Sn	50	57	106.91564(9)	2.90(5) min	β⁺	¹⁰⁷In	(5/2+)
¹⁰⁸Sn	50	58	107.911925(21)	10.30(8) min	β⁺	¹⁰⁸In	0+
¹⁰⁹Sn	50	59	108.911283(11)	18.0(2) min	β⁺	¹⁰⁹In	5/2(+)
¹¹⁰Sn	50	60	109.907843(15)	4.11(10) h	EC	¹¹⁰In	0+
¹¹¹Sn	50	61	110.907734(7)	35.3(6) min	β⁺	¹¹¹In	7/2+
^111mSn	254.72(8) keV			12.5(10) µs			1/2+
¹¹²Sn	50	62	111.904818(5)	Observationally Stable^{[n 5]}			0+	0.0097(1)
¹¹³Sn	50	63	112.905171(4)	115.09(3) d	β⁺	¹¹³In	1/2+
^113mSn	77.386(19) keV			21.4(4) min	IT (91.1%)	¹¹³Sn	7/2+
^113mSn	77.386(19) keV			21.4(4) min	β⁺ (8.9%)	¹¹³In	7/2+
¹¹⁴Sn	50	64	113.902779(3)	Stable^{[n 6]}			0+	0.0066(1)
^114mSn	3087.37(7) keV			733(14) ns			7−
¹¹⁵Sn	50	65	114.903342(3)	Stable^{[n 6]}			1/2+	0.0034(1)
^115m1Sn	612.81(4) keV			3.26(8) µs			7/2+
^115m2Sn	713.64(12) keV			159(1) µs			11/2−
¹¹⁶Sn	50	66	115.901741(3)	Stable^{[n 6]}			0+	0.1454(9)
¹¹⁷Sn	50	67	116.902952(3)	Stable^{[n 6]}			1/2+	0.0768(7)
^117m1Sn	314.58(4) keV			13.76(4) d	IT	¹¹⁷Sn	11/2−
^117m2Sn	2406.4(4) keV			1.75(7) µs			(19/2+)
¹¹⁸Sn	50	68	117.901603(3)	Stable^{[n 6]}			0+	0.2422(9)
¹¹⁹Sn	50	69	118.903308(3)	Stable^{[n 6]}			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			(19/2+)
¹²⁰Sn	50	70	119.9021947(27)	Stable^{[n 6]}			0+	0.3258(9)
^120m1Sn	2481.63(6) keV			11.8(5) µs			(7−)
^120m2Sn	2902.22(22) keV			6.26(11) µs			(10+)#
¹²¹Sn^{[n 7]}	50	71	120.9042355(27)	27.03(4) h	β⁻	¹²¹Sb	3/2+
^121m1Sn	6.30(6) keV			43.9(5) y	IT (77.6%)	¹²¹Sn	11/2−
^121m1Sn	6.30(6) keV			43.9(5) y	β⁻ (22.4%)	¹²¹Sb	11/2−
^121m2Sn	1998.8(9) keV			5.3(5) µs			(19/2+)#
^121m3Sn	2834.6(18) keV			0.167(25) µs			(27/2−)
¹²²Sn^{[n 7]}	50	72	121.9034390(29)	Observationally Stable^{[n 8]}			0+	0.0463(3)
¹²³Sn^{[n 7]}	50	73	122.9057208(29)	129.2(4) d	β⁻	¹²³Sb	11/2−
^123m1Sn	24.6(4) keV			40.06(1) min	β⁻	¹²³Sb	3/2+
^123m2Sn	1945.0(10) keV			7.4(26) µs			(19/2+)
^123m3Sn	2153.0(12) keV			6 µs			(23/2+)
^123m4Sn	2713.0(14) keV			34 µs			(27/2−)
¹²⁴Sn^{[n 7]}	50	74	123.9052739(15)	Observationally Stable^{[n 9]}			0+	0.0579(5)
^124m1Sn	2204.622(23) keV			0.27(6) µs			5-
^124m2Sn	2325.01(4) keV			3.1(5) µs			7−
^124m3Sn	2656.6(5) keV			45(5) µs			(10+)#
¹²⁵Sn^{[n 7]}	50	75	124.9077841(16)	9.64(3) d	β⁻	¹²⁵Sb	11/2−
^125mSn	27.50(14) keV			9.52(5) min			3/2+
¹²⁶Sn^{[n 10]}	50	76	125.907653(11)	2.30(14)×10⁵ y	β⁻ (66.5%)	^126m2Sb	0+
¹²⁶Sn^{[n 10]}	50	76	125.907653(11)	2.30(14)×10⁵ y	β⁻ (33.5%)	^126m1Sb	0+
^126m1Sn	2218.99(8) keV			6.6(14) µs			7−
^126m2Sn	2564.5(5) keV			7.7(5) µs			(10+)#
¹²⁷Sn	50	77	126.910360(26)	2.10(4) h	β⁻	¹²⁷Sb	(11/2−)
^127mSn	4.7(3) keV			4.13(3) min	β⁻	¹²⁷Sb	(3/2+)
¹²⁸Sn	50	78	127.910537(29)	59.07(14) min	β⁻	¹²⁸Sb	0+
^128mSn	2091.50(11) keV			6.5(5) s	IT	¹²⁸Sn	(7−)
¹²⁹Sn	50	79	128.91348(3)	2.23(4) min	β⁻	¹²⁹Sb	(3/2+)#
^129mSn	35.2(3) keV			6.9(1) min	β⁻ (99.99%)	¹²⁹Sb	(11/2−)#
^129mSn	35.2(3) keV			6.9(1) min	IT (.002%)	¹²⁹Sn	(11/2−)#
¹³⁰Sn	50	80	129.913967(11)	3.72(7) min	β⁻	¹³⁰Sb	0+
^130m1Sn	1946.88(10) keV			1.7(1) min	β⁻	¹³⁰Sb	(7−)#
^130m2Sn	2434.79(12) keV			1.61(15) µs			(10+)
¹³¹Sn	50	81	130.917000(23)	56.0(5) s	β⁻	¹³¹Sb	(3/2+)
^131m1Sn	80(30)# keV			58.4(5) s	β⁻ (99.99%)	¹³¹Sb	(11/2−)
^131m1Sn	80(30)# keV			58.4(5) s	IT (.0004%)	¹³¹Sn	(11/2−)
^131m2Sn	4846.7(9) keV			300(20) ns			(19/2− to 23/2−)
¹³²Sn	50	82	131.917816(15)	39.7(8) s	β⁻	¹³²Sb	0+
¹³³Sn	50	83	132.92383(4)	1.45(3) s	β⁻ (99.97%)	¹³³Sb	(7/2−)#
¹³³Sn	50	83	132.92383(4)	1.45(3) s	β⁻, n (.0294%)	¹³²Sb	(7/2−)#
¹³⁴Sn	50	84	133.92829(11)	1.050(11) s	β⁻ (83%)	¹³⁴Sb	0+
¹³⁴Sn	50	84	133.92829(11)	1.050(11) s	β⁻, n (17%)	¹³³Sb	0+
¹³⁵Sn	50	85	134.93473(43)#	530(20) ms	β⁻	¹³⁵Sb	(7/2−)
¹³⁵Sn	50	85	134.93473(43)#	530(20) ms	β⁻, n	¹³⁴Sb	(7/2−)
¹³⁶Sn	50	86	135.93934(54)#	0.25(3) s	β⁻	¹³⁶Sb	0+
¹³⁶Sn	50	86	135.93934(54)#	0.25(3) s	β⁻, n	¹³⁵Sb	0+
¹³⁷Sn	50	87	136.94599(64)#	190(60) ms	β⁻	¹³⁷Sb	5/2−#

↑ Abbreviations:
EC: Electron capture
IT: Isomeric transition
↑ Bold for stable isotopes
↑ Heaviest known nuclide with more protons than neutrons
↑ Heaviest known nuclide with equal numbers of protons and neutrons
↑ Believed to decay by β⁺β⁺ to ¹¹²Cd
↑ ^6.0 ^6.1 ^6.2 ^6.3 ^6.4 ^6.5 ^6.6 Theoretically capable of spontaneous fission
↑ ^7.0 ^7.1 ^7.2 ^7.3 ^7.4 Fission product
↑ Believed to undergo β⁻β⁻ decay to ¹²²Te
↑ Believed to undergo β⁻β⁻ decay to ¹²⁴Te with a half-life over 100×10¹⁵ years
↑ Long-lived fission product

Notes

Geologically exceptional samples are known in which the isotopic composition lies outside the reported range. The uncertainty in the atomic mass may exceed the stated value for such specimens.
Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC, which use expanded uncertainties.

References

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↑ ^2.0 ^2.1 M. B. Chadwick et al, "ENDF/B-VII.1: Nuclear Data for Science and Technology: Cross Sections, Covariances, Fission Product Yields and Decay Data", Nucl. Data Sheets 112(2011)2887. (accessed at www-nds.iaea.org/exfor/endf.htm)
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Isotope masses from:
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Isotopic compositions and standard atomic masses from:
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Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.
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Isotopes of indium	Isotopes of tin	Isotopes of antimony
Table of nuclides

[4] Abbreviations:
EC: Electron capture
IT: Isomeric transition

[5] Bold for stable isotopes

[6] Heaviest known nuclide with more protons than neutrons

[7] Heaviest known nuclide with equal numbers of protons and neutrons

[8] Believed to decay by β⁺β⁺ to ¹¹²Cd

[SF-9] 6.0 ^6.1 ^6.2 ^6.3 ^6.4 ^6.5 ^6.6 Theoretically capable of spontaneous fission

[FP-10] 7.0 ^7.1 ^7.2 ^7.3 ^7.4 Fission product

[11] Believed to undergo β⁻β⁻ decay to ¹²²Te

[12] Believed to undergo β⁻β⁻ decay to ¹²⁴Te with a half-life over 100×10¹⁵ years

[13] Long-lived fission product

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[Chadwick-2] 2.0 ^2.1 M. B. Chadwick et al, "ENDF/B-VII.1: Nuclear Data for Science and Technology: Cross Sections, Covariances, Fission Product Yields and Decay Data", Nucl. Data Sheets 112(2011)2887. (accessed at www-nds.iaea.org/exfor/endf.htm)

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[1]

[2]

[3]

[n 1]

[n 2]

[n 3]

[n 4]

[n 5]

[n 6]

[n 7]

[n 8]

[n 9]

[n 10]

v t e Isotopes of the chemical elements
1 H																	2 He
3 Li	4 Be											5 B	6 C	7 N	8 O	9 F	10 Ne
11 Na	12 Mg											13 Al	14 Si	15 P	16 S	17 Cl	18 Ar
19 K	20 Ca	21 Sc	22 Ti	23 V	24 Cr	25 Mn	26 Fe	27 Co	28 Ni	29 Cu	30 Zn	31 Ga	32 Ge	33 As	34 Se	35 Br	36 Kr
37 Rb	38 Sr	39 Y	40 Zr	41 Nb	42 Mo	43 Tc	44 Ru	45 Rh	46 Pd	47 Ag	48 Cd	49 In	50 Sn	51 Sb	52 Te	53 I	54 Xe
55 Cs	56 Ba		72 Hf	73 Ta	74 W	75 Re	76 Os	77 Ir	78 Pt	79 Au	80 Hg	81 Tl	82 Pb	83 Bi	84 Po	85 At	86 Rn
87 Fr	88 Ra		104 Rf	105 Db	106 Sg	107 Bh	108 Hs	109 Mt	110 Ds	111 Rg	112 Cn	113 Uut	114 Fl	115 Uup	116 Lv	117 Uus	118 Uuo

		57 La	58 Ce	59 Pr	60 Nd	61 Pm	62 Sm	63 Eu	64 Gd	65 Tb	66 Dy	67 Ho	68 Er	69 Tm	70 Yb	71 Lu
		89 Ac	90 Th	91 Pa	92 U	93 Np	94 Pu	95 Am	96 Cm	97 Bk	98 Cf	99 Es	100 Fm	101 Md	102 No	103 Lr
Table of nuclides Categories: Isotopes Tables of nuclides Metastable isotopes Isotopes by element

Isotopes of tin

Contents

Tin-121m

Tin-126

Table

Notes

References

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