Isotopes of indium

Indium (49In) consists of two primordial nuclides, with the most common (95.7%) nuclide (115In) being measurably though weakly radioactive. Its spin-forbidden decay has a half-life of 4.41×1014 years, much longer than the currently accepted age of the Universe.

The stable isotope 113In is only 4.3% of naturally occurring indium. Among elements with a known stable isotope, only tellurium and rhenium also have all stable isotopes in lower abundance than a long-lived radioactive isotope, but the discrepancy is not so striking. Other than 115In, the longest-lived radioisotope is 111In, with a half-life of 2.8048 days. All other radioisotopes have half-lives less than 5 hours. This element also has 47 isomers, the longest-lived being 114m1In, with a half-life of 49.51 days. All other meta-states have half-lives also less than 5 hours.

Indium-111 is used medically in nuclear imaging, as a radiotracer nuclide tag for gamma camera localization of protein radiopharmaceuticals, such as In-111-labeled octreotide, which binds to receptors on certain endocrine tumors (Octreoscan). Indium-111 is also used in indium white blood cell scans, which use nuclear medical techniques to search for hidden infections.

Several proton-rich isotopes of indium have been used to help measure the mass of the doubly-magic isotope tin-100.

List of isotopes

|-id=Indium-96 | rowspan=2|96In | rowspan=2 style="text-align:right" | 49 | rowspan=2 style="text-align:right" | 47 | rowspan=2|95.95911(54)# | rowspan=2 style="text-align:center" | 2016 | rowspan=2|1# ms[>400 ns] | β+? | 96Cd | rowspan=2|9/2+# | rowspan=2| | rowspan=2| |- | p? | 95Cd |-id=Indium-97 | rowspan=3|97In | rowspan=3 style="text-align:right" | 49 | rowspan=3 style="text-align:right" | 48 | rowspan=3|96.94913(43)# | rowspan=3 style="text-align:center" | 2012 | rowspan=3|36(6) ms | β+ (97.7%) | 97Cd | rowspan=3|9/2+# | rowspan=3| | rowspan=3| |- | β+, p (2.3%) | 96Ag |- | p? | 96Cd |-id=Indium-97m | style="text-indent:1em" | 97mIn | colspan="3" style="text-indent:2em" | 400(100)# keV | style="text-align:center" | 2018 | 0.12(7) ms | p? | 96Cd | 1/2−#

|-id=Indium-98 | rowspan=2|98In | rowspan=2 style="text-align:right" | 49 | rowspan=2 style="text-align:right" | 49 | rowspan=2|97.94213(33)# | rowspan=2 style="text-align:center" | 1994 | rowspan=2|30(1) ms | β+ (>99.87%) | 98Cd | rowspan=2|(0+) | rowspan=2| | rowspan=2| |- | β+, p (<0.13%) | 97Ag |-id=Indium-98m | rowspan=2 style="text-indent:1em" | 98mInOrder of ground state and isomer is uncertain. | rowspan=2 colspan="3" style="text-indent:2em" | 820(730) keV | rowspan=2 style="text-align:center" | 2001 | rowspan=2|890(20) ms | β+ (56%) | 98Cd | rowspan=2|(9+) | rowspan=2| | rowspan=2| |- | β+, p (44%) | 97Ag |-id=Indium-99 | rowspan=2|99In | rowspan=2 style="text-align:right" | 49 | rowspan=2 style="text-align:right" | 50 | rowspan=2|98.93411(32)# | rowspan=2 style="text-align:center" | 1994 | rowspan=2|3.11(6) s | β+ (99.71%) | 99Cd | rowspan=2|9/2+# | rowspan=2| | rowspan=2| |- | β+, p (0.29%) | 98Ag |-id=Indium-99m | style="text-indent:1em" | 99mIn | colspan="3" style="text-indent:2em" | 671(37) keV | style="text-align:center" | 2023 | 1 s#

| 1/2−#

|-id=Indium-100 | rowspan=2|100In | rowspan=2 style="text-align:right" | 49 | rowspan=2 style="text-align:right" | 51 | rowspan=2|99.9311019(24) | rowspan=2 style="text-align:center" | 1982 | rowspan=2|5.62(6) s | β+ (98.34%) | 100Cd | rowspan=2|6+# | rowspan=2| | rowspan=2| |- | β+, p (1.66%) | 99Ag |-id=Indium-101 | rowspan=2|101In | rowspan=2 style="text-align:right" | 49 | rowspan=2 style="text-align:right" | 52 | rowspan=2|100.926414(13) | rowspan=2 style="text-align:center" | 1988 | rowspan=2|15.1(11) s | β+ (>98.3%) | 101Cd | rowspan=2|(9/2+) | rowspan=2| | rowspan=2| |- | β+, p (<1.7%) | 100Ag |-id=Indium-101m | rowspan=2 style="text-indent:1em" | 101mIn | rowspan=2 colspan="3" style="text-indent:2em" | 640(40) keV | rowspan=2 style="text-align:center" | 2019 | rowspan=2|10# s | β+? | 101Cd | rowspan=2|1/2−# | rowspan=2| | rowspan=2| |- | IT? | 101In |-id=Indium-102 | rowspan=2|102In | rowspan=2 style="text-align:right" | 49 | rowspan=2 style="text-align:right" | 53 | rowspan=2|101.9241059(49) | rowspan=2 style="text-align:center" | 1981 | rowspan=2|23.3(1) s | β+ (99.99%) | 102Cd | rowspan=2|(6+) | rowspan=2| | rowspan=2| |- | β+, p (0.0093%) | 101Ag |-id=Indium-103 | 103In | style="text-align:right" | 49 | style="text-align:right" | 54 | 102.9198788(96) | style="text-align:center" | 1978 | 60(1) s | β+ | 103Cd | (9/2+)

|-id=Indium-103m | rowspan=2 style="text-indent:1em" | 103mIn | rowspan=2 colspan="3" style="text-indent:2em" | 631.7(1) keV | rowspan=2 style="text-align:center" | 1997 | rowspan=2|34(2) s | β+ (67%) | 103Cd | rowspan=2|(1/2−) | rowspan=2| | rowspan=2| |- | IT (33%) | 103In |-id=Indium-104 | 104In | style="text-align:right" | 49 | style="text-align:right" | 55 | 103.9182145(62) | style="text-align:center" | 1977 | 1.80(3) min | β+ | 104Cd | (5+)

|-id=Indium-104m | rowspan=2 style="text-indent:1em" | 104mIn | rowspan=2 colspan="3" style="text-indent:2em" | 93.48(10) keV | rowspan=2 style="text-align:center" | 1988 | rowspan=2|15.7(5) s | IT (80%) | 104In | rowspan=2|(3+) | rowspan=2| | rowspan=2| |- | β+ (20%) | 104Cd |-id=Indium-105 | 105In | style="text-align:right" | 49 | style="text-align:right" | 56 | 104.914502(11) | style="text-align:center" | 1975 | 5.07(7) min | β+ | 105Cd | 9/2+

|-id=Indium-105m | rowspan=2 style="text-indent:1em" | 105mIn | rowspan=2 colspan="3" style="text-indent:2em" | 674.09(25) keV | rowspan=2 style="text-align:center" | 1975 | rowspan=2|48(6) s | IT | 105In | rowspan=2|(1/2)− | rowspan=2| | rowspan=2| |- | β+? | 105Cd |-id=Indium-106 | 106In | style="text-align:right" | 49 | style="text-align:right" | 57 | 105.9134636(13) | style="text-align:center" | 1962 | 6.2(1) min | β+ | 106Cd | 7+

|-id=Indium-106m | style="text-indent:1em" | 106mIn | colspan="3" style="text-indent:2em" | 28.6(3) keV | style="text-align:center" | 1966 | 5.2(1) min | β+ | 106Cd | (2)+

|-id=Indium-107 | 107In | style="text-align:right" | 49 | style="text-align:right" | 58 | 106.910287(10) | style="text-align:center" | 1949 | 32.4(3) min | β+ | 107Cd | 9/2+

|-id=Indium-107m | style="text-indent:1em" | 107mIn | colspan="3" style="text-indent:2em" | 678.5(3) keV | style="text-align:center" | 1973 | 50.4(6) s | IT | 107In | 1/2−

|-id=Indium-108 | 108In | style="text-align:right" | 49 | style="text-align:right" | 59 | 107.9096937(93) | style="text-align:center" | 1949 | 58.0(12) min | β+ | 108Cd | 7+

|-id=Indium-108m | style="text-indent:1em" | 108mIn | colspan="3" style="text-indent:2em" | 29.75(5) keV | style="text-align:center" | 1962 | 39.6(7) min | β+ | 108Cd | 2+

|-id=Indium-109 | 109In | style="text-align:right" | 49 | style="text-align:right" | 60 | 108.9071497(43) | style="text-align:center" | 1948 | 4.159(10) h | β+ | 109Cd | 9/2+

|-id=Indium-109m1 | style="text-indent:1em" | 109m1In | colspan="3" style="text-indent:2em" | 649.79(10) keV | style="text-align:center" | 1966 | 1.34(6) min | IT | 109In | 1/2−

|-id=Indium-109m2 | style="text-indent:1em" | 109m2In | colspan="3" style="text-indent:2em" | 2101.86(11) keV | style="text-align:center" | 1965 | 210.0(9) ms | IT | 109In | 19/2+

|-id=Indium-110 | 110In | style="text-align:right" | 49 | style="text-align:right" | 61 | 109.907171(12) | style="text-align:center" | 1939 | 4.92(8) h | β+ | 110Cd | 7+

|-id=Indium-110m | style="text-indent:1em" | 110mIn | colspan="3" style="text-indent:2em" | 62.08(4) keV | style="text-align:center" | 1951 | 69.1(5) min | β+ | 110Cd | 2+

|-id=Indium-111 | 111InUsed in medical applications | style="text-align:right" | 49 | style="text-align:right" | 62 | 110.9051072(37) | style="text-align:center" | 1947 | 2.8048(1) d | EC | 111Cd | 9/2+

|-id=Indium-111m | style="text-indent:1em" | 111mIn | colspan="3" style="text-indent:2em" | 536.99(7) keV | style="text-align:center" | 1966 | 7.7(2) min | IT | 111In | 1/2−

|-id=Indium-112 | rowspan=2|112In | rowspan=2 style="text-align:right" | 49 | rowspan=2 style="text-align:right" | 63 | rowspan=2|111.9055387(46) | rowspan=2 style="text-align:center" | 1947 | rowspan=2|14.88(15) min | β+ (62%) | 112Cd | rowspan=2|1+ | rowspan=2| | rowspan=2| |- | β− (38%) | 112Sn |-id=Indium-112m1 | style="text-indent:1em" | 112m1In | colspan="3" style="text-indent:2em" | 156.592(25) keV | style="text-align:center" | 1947 | 20.67(8) min | IT | 112In | 4+

|-id=Indium-112m2 | style="text-indent:1em" | 112m2In | colspan="3" style="text-indent:2em" | 350.80(5) keV | style="text-align:center" | 1976 | 690(50) ns | IT | 112In | (7)+

|-id=Indium-112m3 | style="text-indent:1em" | 112m3In | colspan="3" style="text-indent:2em" | 613.82(6) keV | style="text-align:center" | 1976 | 2.81(3) μs | IT | 112In | 8−

|-id=Indium-113 | 113In | style="text-align:right" | 49 | style="text-align:right" | 64 | 112.90406045(20) | style="text-align:center" | 1934 | colspan=3 align=center|Stable | 9/2+ | 0.04281(52) | |-id=Indium-113m | style="text-indent:1em" | 113mIn | colspan="3" style="text-indent:2em" | 391.699(3) keV | style="text-align:center" | 1939 | 1.6579(4) h | IT | 113In | 1/2−

|-id=Indium-114 | rowspan=2|114In | rowspan=2 style="text-align:right" | 49 | rowspan=2 style="text-align:right" | 65 | rowspan=2|113.90491641(32) | rowspan=2 style="text-align:center" | 1937 | rowspan=2|71.9(1) s | β− (99.50%) | 114Sn | rowspan=2|1+ | rowspan=2| | rowspan=2| |- | β+ (0.50%) | 114Cd |-id=Indium-114m1 | rowspan=2 style="text-indent:1em" | 114m1In | rowspan=2 colspan="3" style="text-indent:2em" | 190.2682(8) keV | rowspan=2 style="text-align:center" | 1940 | rowspan=2|49.51(1) d | IT (96.75%) | 114In | rowspan=2|5+ | rowspan=2| | rowspan=2| |- | β+ (3.25%) | 114Cd |-id=Indium-114m2 | style="text-indent:1em" | 114m2In | colspan="3" style="text-indent:2em" | 501.948(3) keV | style="text-align:center" | 1958 |43.1(6) ms | IT | 114m1In |8− | |-id=Indium-115 | 115InFission productPrimordial radionuclide | style="text-align:right" | 49 | style="text-align:right" | 66 | 114.903878772(12) | style="text-align:center" | 1924 | 4.41(25)×1014 y | β− | 115Sn | 9/2+ | 0.95719(52) | |-id=Indium-115m | rowspan=2 style="text-indent:1em" | 115mIn | rowspan=2 colspan="3" style="text-indent:2em" | 336.244(17) keV | rowspan=2 style="text-align:center" | 1939 | rowspan=2|4.486(4) h | IT (95.0%) | 115In | rowspan=2|1/2− | rowspan=2| | rowspan=2| |- | β− (5.0%) | 115Sn |-id=Indium-116 | rowspan=2|116In | rowspan=2 style="text-align:right" | 49 | rowspan=2 style="text-align:right" | 67 | rowspan=2|115.90525999(24) | rowspan=2 style="text-align:center" | 1937 | rowspan=2|14.10(3) s | β− (99.98%) | 116Sn | rowspan=2|1+ | rowspan=2| | rowspan=2| |- | EC (0.0237%) | 116Cd |-id=Indium-116m1 | style="text-indent:1em" | 116m1In | colspan="3" style="text-indent:2em" | 127.267(6) keV | style="text-align:center" | 1937 | 54.29(17) min | β− | 116Sn | 5+

|-id=Indium-116m2 | style="text-indent:1em" | 116m2In | colspan="3" style="text-indent:2em" | 289.660(6) keV | style="text-align:center" | 1960 | 2.18(4) s | IT | 116m1In | 8−

|-id=Indium-117 | 117In | style="text-align:right" | 49 | style="text-align:right" | 68 | 116.9045157(52) | style="text-align:center" | 1937 | 43.2(3) min | β− | 117Sn | 9/2+

|-id=Indium-117m | rowspan=2 style="text-indent:1em" | 117mIn | rowspan=2 colspan="3" style="text-indent:2em" | 315.303(11) keV | rowspan=2 style="text-align:center" | 1955 | rowspan=2|116.2(3) min | β− (52.9%) | 117Sn | rowspan=2|1/2− | rowspan=2| | rowspan=2| |- | IT (47.1%) | 117In |-id=Indium-118 | 118In | style="text-align:right" | 49 | style="text-align:right" | 69 | 117.9063567(83) | style="text-align:center" | 1949 | 5.0(5) s | β− | 118Sn | 1+

|-id=Indium-118m1 | style="text-indent:1em" | 118m1In | colspan="3" style="text-indent:2em" | 100(50)# keV | style="text-align:center" | 1961 | 4.364(7) min | β− | 118Sn | 5+

|-id=Indium-118m2