Калај (50Sn) е елементот со најголем број стабилни изотопи (десет; три од нив се потенцијално радиоактивни, но не е забележано дека се распаѓаат). Ова веројатно е поврзано со фактот дека 50 е „ магичен број“ на протони. Дополнително, познати се и девет нестабилни изотопи на калај, вклучително и тин-100 (100Sn) (откриен во 1994 година) и калај-132 (132Sn), кои и двата се „двојно магични“. Најдолговечниот радиоизотоп на калај е тин-126 ( 126Sn), со период на полураспаѓање од 230.000 години. Останатите 28 радиоизотопи имаат период на полураспаѓање помал од една година.
Список на изотопи
|-id=Tin-99 | rowspan=2|99SnHeaviest known nuclide with more protons than neutrons | rowspan=2 style="text-align:right" | 50 | rowspan=2 style="text-align:right" | 49 | rowspan=2|98.94850(63)# | rowspan=2|24(4) ms | β+ (95%) | 99In | rowspan=2|9/2+# | rowspan=2| | rowspan=2| |- | β+p (5%) | 98Cd |-id=Tin-100 | rowspan=2|100SnHeaviest nuclide with equal numbers of protons and neutrons with no observed α decay | rowspan=2 style="text-align:right" | 50 | rowspan=2 style="text-align:right" | 50 | rowspan=2|99.93865(26) | rowspan=2|1.18(8) s | β+ (>83%) | 100In | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β+p (<17%) | 99Cd |-id=Tin-101 | rowspan=2|101Sn | rowspan=2 style="text-align:right" | 50 | rowspan=2 style="text-align:right" | 51 | rowspan=2|100.93526(32) | rowspan=2|2.22(5) s | β+ | 101In | rowspan=2|(7/2+) | rowspan=2| | rowspan=2| |- | β+p? | 100Cd |-id=Tin-102 | 102Sn | style="text-align:right" | 50 | style="text-align:right" | 52 | 101.93029(11) | 3.8(2) s | β+ | 102In | 0+
|-id=Tin-102m | style="text-indent:1em" | 102mSn | colspan="3" style="text-indent:2em" | 2017(2) keV | 367(8) ns | IT | 102Sn | (6+)
|-id=Tin-103 | rowspan=2|103Sn | rowspan=2 style="text-align:right" | 50 | rowspan=2 style="text-align:right" | 53 | rowspan=2|102.92797(11)# | rowspan=2|7.0(2) s | β+ (98.8%) | 103In | rowspan=2|5/2+# | rowspan=2| | rowspan=2| |- | β+p (1.2%) | 102Cd |-id=Tin-104 | 104Sn | style="text-align:right" | 50 | style="text-align:right" | 54 | 103.923105(6) | 20.8(5) s | β+ | 104In | 0+
|-id=Tin-105 | rowspan=2|105Sn | rowspan=2 style="text-align:right" | 50 | rowspan=2 style="text-align:right" | 55 | rowspan=2|104.921268(4) | rowspan=2|32.7(5) s | β+ | 105In | rowspan=2|(5/2+) | rowspan=2| | rowspan=2| |- | β+p (0.011%) | 104Cd |-id=Tin-106 | 106Sn | style="text-align:right" | 50 | style="text-align:right" | 56 | 105.916957(5) | 1.92(8) min | β+ | 106In | 0+
|-id=Tin-107 | 107Sn | style="text-align:right" | 50 | style="text-align:right" | 57 | 106.915714(6) | 2.90(5) min | β+ | 107In | (5/2+)
|-id=Tin-108 | 108Sn | style="text-align:right" | 50 | style="text-align:right" | 58 | 107.911894(6) | 10.30(8) min | β+ | 108In | 0+
|-id=Tin-109 | 109Sn | style="text-align:right" | 50 | style="text-align:right" | 59 | 108.911293(9) | 18.1(2) min | β+ | 109In | 5/2+
|-id=Tin-110 | 110Sn | style="text-align:right" | 50 | style="text-align:right" | 60 | 109.907845(15) | 4.154(4) h | EC | 110In | 0+
|-id=Tin-111 | 111Sn | style="text-align:right" | 50 | style="text-align:right" | 61 | 110.907741(6) | 35.3(6) min | β+ | 111In | 7/2+
|-id=Tin-111m | style="text-indent:1em" | 111mSn | colspan="3" style="text-indent:2em" | 254.71(4) keV | 12.5(10) μs | IT | 111Sn | 1/2+
|-id=Tin-112 | 112Sn | style="text-align:right" | 50 | style="text-align:right" | 62 |111.9048249(3) | colspan=3 align=center|Observationally StableBelieved to decay by β+β+ to 112Cd | 0+ | 0.0097(1) | |-id=Tin-113 | 113Sn | style="text-align:right" | 50 | style="text-align:right" | 63 |112.9051759(17) | 115.08(4) d | β+ | 113In | 1/2+
|-id=Tin-113m | rowspan=2 style="text-indent:1em" | 113mSn | rowspan=2 colspan="3" style="text-indent:2em" | 77.389(19) keV | rowspan=2|21.4(4) min | IT (91.1%) | 113Sn | rowspan=2|7/2+ | rowspan=2| | rowspan=2| |- | β+ (8.9%) | 113In |-id=Tin-114 | 114Sn | style="text-align:right" | 50 | style="text-align:right" | 64 |113.90278013(3) | colspan=3 align=center|Stable | 0+ | 0.0066(1) | |-id=Tin-114m | style="text-indent:1em" | 114mSn | colspan="3" style="text-indent:2em" | 3087.37(7) keV | 733(14) ns | IT | 114Sn | 7−
|-id=Tin-115 | 115Sn | style="text-align:right" | 50 | style="text-align:right" | 65 | 114.903344695(16) | colspan=3 align=center|Stable | 1/2+ | 0.0034(1) | |-id=Tin-115m1 | style="text-indent:1em" | 115m1Sn | colspan="3" style="text-indent:2em" | 612.81(4) keV | 3.26(8) μs | IT | 115Sn | 7/2+
|-id=Tin-115m2 | style="text-indent:1em" | 115m2Sn | colspan="3" style="text-indent:2em" | 713.64(12) keV | 159(1) μs | IT | 115Sn | 11/2−
|-id=Tin-116 | 116Sn | style="text-align:right" | 50 | style="text-align:right" | 66 | 115.90174283(10) | colspan=3 align=center|Stable | 0+ | 0.1454(9) | |-id=Tin-116m1 | style="text-indent:1em" | 116m1Sn | colspan="3" style="text-indent:2em" | 2365.975(21) keV | 348(19) ns | IT | 116Sn | 5−
|-id=Tin-116m2 | style="text-indent:1em" | 116m2Sn | colspan="3" style="text-indent:2em" | 3547.16(17) keV | 833(30) ns | IT | 116Sn | 10+
|-id=Tin-117 | 117Sn | style="text-align:right" | 50 | style="text-align:right" | 67 | 116.90295404(52) | colspan=3 align=center|Stable | 1/2+ | 0.0768(7) | |-id=Tin-117m1 | style="text-indent:1em" | 117m1Sn | colspan="3" style="text-indent:2em" | 314.58(4) keV | 13.939(24) d | IT | 117Sn | 11/2−
|-id=Tin-117m2 | style="text-indent:1em" | 117m2Sn | colspan="3" style="text-indent:2em" | 2406.4(4) keV | 1.75(7) μs | IT | 117Sn | (19/2+)
|-id=Tin-118 | 118Sn | style="text-align:right" | 50 | style="text-align:right" | 68 | 117.90160663(54) | colspan=3 align=center|Stable | 0+ | 0.2422(9) | |-id=Tin-118m1 | style="text-indent:1em" | 118m1Sn | colspan="3" style="text-indent:2em" | 2574.91(4) keV | 230(10) ns | IT | 118Sn | 7−
|-id=Tin-118m2 | style="text-indent:1em" | 118m2Sn | colspan="3" style="text-indent:2em" | 3108.06(22) keV | 2.52(6) μs | IT | 118Sn | (10+)
|-id=Tin-119 | 119Sn | style="text-align:right" | 50 | style="text-align:right" | 69 | 118.90331127(78) | colspan=3 align=center|Stable | 1/2+ | 0.0859(4) | |-id=Tin-119m1 | style="text-indent:1em" | 119m1Sn | colspan="3" style="text-indent:2em" | 89.531(13) keV | 293.1(7) d | IT | 119Sn | 11/2−
|-id=Tin-119m2 | style="text-indent:1em" | 119m2Sn | colspan="3" style="text-indent:2em" | 2127.0(10) keV | 9.6(12) μs | IT | 119Sn | (19/2+)
|-id=Tin-119m3 | style="text-indent:1em" | 119m3Sn | colspan="3" style="text-indent:2em" | 2369.0(3) keV | 96(9) ns | IT | 119Sn | 23/2+
|-id=Tin-120 | 120Sn | style="text-align:right" | 50 | style="text-align:right" | 70 | 119.90220256(99) | colspan=3 align=center|Stable | 0+ | 0.3258(9) | |-id=Tin-120m1 | style="text-indent:1em" | 120m1Sn | colspan="3" style="text-indent:2em" | 2481.63(6) keV | 11.8(5) μs | IT | 120Sn | 7−
|-id=Tin-120m2 | style="text-indent:1em" | 120m2Sn | colspan="3" style="text-indent:2em" | 2902.22(22) keV | 6.26(11) μs | IT | 120Sn | 10+
|-id=Tin-121 | 121SnFission product | style="text-align:right" | 50 | style="text-align:right" | 71 | 120.9042435(11) | 27.03(4) h | β− | 121Sb | 3/2+
|-id=Tin-121m1 | rowspan=2 style="text-indent:1em" | 121m1Sn | rowspan=2 colspan="3" style="text-indent:2em" | 6.31(6) keV | rowspan=2|43.9(5) y | IT (77.6%) | 121Sn | rowspan=2| 11/2− | rowspan=2| | rowspan=2| |- | β− (22.4%) | 121Sb |-id=Tin-121m2 | style="text-indent:1em" | 121m2Sn | colspan="3" style="text-indent:2em" | 1998.68(13) keV | 5.3(5) μs | IT | 121Sn | 19/2+
|-id=Tin-121m3 | style="text-indent:1em" | 121m3Sn | colspan="3" style="text-indent:2em" | 2222.0(2) keV | 520(50) ns | IT | 121Sn | 23/2+
|-id=Tin-121m4 | style="text-indent:1em" | 121m4Sn | colspan="3" style="text-indent:2em" | 2833.9(2) keV | 167(25) ns | IT | 121Sn | 27/2−
|-id=Tin-122 | 122Sn | style="text-align:right" | 50 | style="text-align:right" | 72 | 121.9034455(26) | colspan=3 align=center|Observationally StableBelieved to undergo β−β− decay to 122Te | 0+ | 0.0463(3) | |-id=Tin-122m1 | style="text-indent:1em" | 122m1Sn | colspan="3" style="text-indent:2em" | 2409.03(4) keV | 7.5(9) μs | IT | 122Sn | 7−
|-id=Tin-122m2 | style="text-indent:1em" | 122m2Sn | colspan="3" style="text-indent:2em" | 2765.5(3) keV | 62(3) μs | IT | 122Sn | 10+
|-id=Tin-122m3 | style="text-indent:1em" | 122m3Sn | colspan="3" style="text-indent:2em" | 4721.2(3) keV | 139(9) ns | IT | 122Sn | 15−
|-id=Tin-123 | 123Sn | style="text-align:right" | 50 | style="text-align:right" | 73 | 122.9057271(27) | 129.2(4) d | β− | 123Sb | 11/2−
|-id=Tin-123m1 | style="text-indent:1em" | 123m1Sn | colspan="3" style="text-indent:2em" | 24.6(4) keV | 40.06(1) min | β− | 123Sb | 3/2+
|-id=Tin-123m2 | style="text-indent:1em" | 123m2Sn | colspan="3" style="text-indent:2em" | 1944.90(12) keV | 7.4(26) μs | IT | 123Sn | 19/2+
|-id=Tin-123m3 | style="text-indent:1em" | 123m3Sn | colspan="3" style="text-indent:2em" | 2152.66(19) keV | 6 μs | IT | 123Sn | 23/2+
|-id=Tin-123m4 | style="text-indent:1em" | 123m4Sn | colspan="3" style="text-indent:2em" | 2712.47(21) keV | 34 μs | IT | 123Sn | 27/2−
|-id=Tin-124 | 124Sn | style="text-align:right" | 50 | style="text-align:right" | 74 | 123.9052796(14) | colspan=3 align=center|Observationally StableBelieved to undergo β−β− decay to 124Te with a half-life over 1×1017 years | 0+ | 0.0579(5) | |-id=Tin-124m1 | style="text-indent:1em" | 124m1Sn | colspan="3" style="text-indent:2em" | 2204.620(23) keV | 270(60) ns | IT | 124Sn | 5-
|-id=Tin-124m2 | style="text-indent:1em" | 124m2Sn | colspan="3" style="text-indent:2em" | 2324.96(4) keV | 3.1(5) μs | IT | 124Sn | 7−
|-id=Tin-124m3 | style="text-indent:1em" | 124m3Sn | colspan="3" style="text-indent:2em" | 2656.6(3) keV | 51(3) μs | IT | 124Sn | 10+
|-id=Tin-124m4 | style="text-indent:1em" | 124m4Sn | colspan="3" style="text-indent:2em" | 4552.4(3) keV | 260(25) ns | IT | 124Sn | 15−
|-id=Tin-125 | 125Sn | style="text-align:right" | 50 | style="text-align:right" | 75 | 124.9077894(14) | 9.634(15) d | β− | 125Sb | 11/2−
|-id=Tin-125m1 | style="text-indent:1em" | 125m1Sn | colspan="3" style="text-indent:2em" | 27.50(14) keV | 9.77(25) min | β− | 125Sb | 3/2+
|-id=Tin-125m2 | style="text-indent:1em" | 125m2Sn | colspan="3" style="text-indent:2em" | 1892.8(3) keV | 6.2(2) μs | IT | 125Sn | 19/2+
|-id=Tin-125m3 | style="text-indent:1em" | 125m3Sn | colspan="3" style="text-indent:2em" | 2059.5(4) keV | 650(60) ns | IT | 125Sn | 23/2+
|-id=Tin-125m4 | style="text-indent:1em" | 125m4Sn | colspan="3" style="text-indent:2em" | 2623.5(5) keV | 230(17) ns | IT | 125Sn | 27/2−
| 126SnLong-lived fission product | style="text-align:right" | 50 | style="text-align:right" | 76 | 125.907658(11) | 2.30(14)×105 y | β− | 126Sb | 0+ | < 10−14 | |-id=Tin-126m1 | style="text-indent:1em" | 126m1Sn | colspan="3" style="text-indent:2em" | 2218.99(8) keV | 6.1(7) μs | IT | 126Sn | 7−
|-id=Tin-126m2 | style="text-indent:1em" | 126m2Sn | colspan="3" style="text-indent:2em" | 2564.5(5) keV | 7.6(3) μs | IT | 126Sn | 10+
|-id=Tin-126m3 | style="text-indent:1em" | 126m3Sn | colspan="3" style="text-indent:2em" | 4347.4(4) keV | 114(2) ns | IT | 126Sn | 15−
|-id=Tin-127 | 127Sn | style="text-align:right" | 50 | style="text-align:right" | 77 | 126.9103917(99) | 2.10(4) h | β− | 127Sb | 11/2−
|-id=Tin-127m1 | style="text-indent:1em" | 127m1Sn | colspan="3" style="text-indent:2em" | 5.07(6) keV | 4.13(3) min | β− | 127Sb | 3/2+
|-id=Tin-127m2 | style="text-indent:1em" | 127m2Sn | colspan="3" style="text-indent:2em" | 1826.67(16) keV | 4.52(15) μs | IT | 127Sn | 19/2+
|-id=Tin-127m3 | style="text-indent:1em" | 127m3Sn | colspan="3" style="text-indent:2em" | 1930.97(17) keV | 1.26(15) μs | IT | 127Sn | (23/2+)
|-id=Tin-127m4 | style="text-indent:1em" | 127m4Sn | colspan="3" style="text-indent:2em" | 2552.4(10) keV | 250 ns (30) ns | IT | 127Sn | (27/2−)
|-id=Tin-128 | 128Sn | style="text-align:right" | 50 | style="text-align:right" | 78 |127.910508(19) | 59.07(14) min | β− | 128Sb | 0+
|-id=Tin-128m1