Indium Indium is a chemical element with the symbol In and atomic number 49. Indium is the softest metal that is not an alkali metal. It is a silvery-white metal that resembles tin in appearance. It is a post-transition metal that makes up 0.21 parts ...

(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. The stable isotope ¹¹³In is only 4.3% of naturally occurring indium. Among elements with a known stable isotope, only

tellurium Tellurium is a chemical element with the symbol Te and atomic number 52. It is a brittle, mildly toxic, rare, silver-white metalloid. Tellurium is chemically related to selenium and sulfur, all three of which are chalcogens. It is occasionall ...

and

rhenium Rhenium is a chemical element with the symbol Re and atomic number 75. It is a silvery-gray, heavy, third-row transition metal in group 7 of the periodic table. With an estimated average concentration of 1 part per billion (ppb), rhenium is one ...

similarly occur with a stable isotope in lower abundance than the long-lived radioactive isotope. Other than ¹¹⁵In, the longest-lived radioisotope is ¹¹¹In, with a half-life of 2.8047 days. All other radioisotopes have half-lives less than a day. This element also has 47

isomers In chemistry, isomers are molecules or polyatomic ions with identical molecular formulae – that is, same number of atoms of each element – but distinct arrangements of atoms in space. Isomerism is existence or possibility of isomers. ...

, the longest-lived being ^114m1In, with a half-life of 49.51 days. All other meta-states have half-lives less than a day, most less than an hour, and many measured in milliseconds or less. Indium-111 is used medically in

nuclear imaging Nuclear medicine or nucleology is a medical specialty involving the application of radioactive substances in the diagnosis and treatment of disease. Nuclear imaging, in a sense, is "radiology done inside out" because it records radiation emittin ...

, as a

radiotracer A radioactive tracer, radiotracer, or radioactive label is a chemical compound in which one or more atoms have been replaced by a radionuclide so by virtue of its radioactive decay it can be used to explore the mechanism of chemical reactions by tr ...

nuclide tag for

gamma camera A gamma camera (γ-camera), also called a scintillation camera or Anger camera, is a device used to image gamma radiation emitting radioisotopes, a technique known as scintigraphy. The applications of scintigraphy include early drug development ...

localization of protein

radiopharmaceutical Radiopharmaceuticals, or medicinal radiocompounds, are a group of pharmaceutical drugs containing radioactive isotopes. Radiopharmaceuticals can be used as diagnostic and therapeutic agents. Radiopharmaceuticals emit radiation themselves, which ...

s, such as In-111-labeled

octreotide Octreotide, sold under the brand name Sandostatin among others, is an octapeptide that mimics natural somatostatin pharmacologically, though it is a more potent inhibitor of growth hormone, glucagon, and insulin than the natural hormone. It was ...

, which binds to receptors on certain endocrine tumors (

Octreoscan An octreotide scan is a type of SPECT scintigraphy used to find carcinoid, pancreatic neuroendocrine tumors, and to localize sarcoidosis. It is also called somatostatin receptor scintigraphy (SRS). Octreotide, a drug similar to somatostatin, is rad ...

). Indium-111 is also used in

indium white blood cell scan The indium white blood cell scan is a nuclear medicine procedure in which white blood cells (mostly neutrophils) are removed from the patient, tagged with the radioisotope Indium-111, and then injected intravenously into the patient. The tagged le ...

s, which use nuclear medical techniques to search for hidden infections.

List of isotopes

, - , ⁹⁷In , style="text-align:right" , 49 , style="text-align:right" , 48 , 96.94954(64)# , 5# ms , , , 9/2+# , , , - , ⁹⁸In , style="text-align:right" , 49 , style="text-align:right" , 49 , 97.94214(21)# , 45(23) ms
2(+32−11) ms, β⁺ , ⁹⁸Cd , 0+# , , , - , style="text-indent:1em" , ^98mIn , colspan="3" style="text-indent:2em" , 0(500)# keV , 1.7(8) s
.2(+12−4) s, , , , , , - , ⁹⁹In , style="text-align:right" , 49 , style="text-align:right" , 50 , 98.93422(43)# , 3.1(8) s
.0(+8-7) s, β⁺ , ⁹⁹Cd , 9/2+# , , , - , style="text-indent:1em" , ^99mIn , colspan="3" style="text-indent:2em" , 400(150)# keV , 1# s , , , 1/2−# , , , - , rowspan=2, ¹⁰⁰In , rowspan=2 style="text-align:right" , 49 , rowspan=2 style="text-align:right" , 51 , rowspan=2, 99.93111(27) , rowspan=2, 5.9(2) s , β⁺ (96.1%) , ¹⁰⁰Cd , rowspan=2, (6, 7)+ , rowspan=2, , rowspan=2, , - , β⁺, p (3.9%) , ⁹⁹Ag , - , rowspan=2, ¹⁰¹In , rowspan=2 style="text-align:right" , 49 , rowspan=2 style="text-align:right" , 52 , rowspan=2, 100.92634(32)# , rowspan=2, 15.1(3) s , β⁺ , ¹⁰¹Cd , rowspan=2, 9/2+# , rowspan=2, , rowspan=2, , - , β⁺, p , ¹⁰⁰Ag , - , style="text-indent:1em" , ^101mIn , colspan="3" style="text-indent:2em" , 550(100)# keV , 10# s , , , 1/2−# , , , - , rowspan=2, ¹⁰²In , rowspan=2 style="text-align:right" , 49 , rowspan=2 style="text-align:right" , 53 , rowspan=2, 101.92409(12) , rowspan=2, 23.3(1) s , β⁺ (99.99%) , ¹⁰²Cd , rowspan=2, (6+) , rowspan=2, , rowspan=2, , - , β⁺, p (.00929%) , ¹⁰¹Ag , - , ¹⁰³In , style="text-align:right" , 49 , style="text-align:right" , 54 , 102.919914(27) , 60(1) s , β⁺ , ¹⁰³Cd , 9/2+# , , , - , style="text-indent:1em" , ^103mIn , colspan="3" style="text-indent:2em" , 631.7(1) keV , 34(2) s , , , (1/2−)# , , , - , ¹⁰⁴In , style="text-align:right" , 49 , style="text-align:right" , 55 , 103.91830(9) , 1.80(3) min , β⁺ , ¹⁰⁴Cd , 5, 6(+) , , , - , rowspan=2 style="text-indent:1em" , ^104mIn , rowspan=2 colspan="3" style="text-indent:2em" , 93.48(10) keV , rowspan=2, 15.7(5) s , IT (80%) , ¹⁰⁴In , rowspan=2, (3+) , rowspan=2, , rowspan=2, , - , β⁺ (20%) , ¹⁰⁴Cd , - , ¹⁰⁵In , style="text-align:right" , 49 , style="text-align:right" , 56 , 104.914674(19) , 5.07(7) min , β⁺ , ¹⁰⁵Cd , 9/2+ , , , - , style="text-indent:1em" , ^105mIn , colspan="3" style="text-indent:2em" , 674.1(3) keV , 48(6) s , IT , ¹⁰⁵In , (1/2)− , , , - , ¹⁰⁶In , style="text-align:right" , 49 , style="text-align:right" , 57 , 105.913465(13) , 6.2(1) min , β⁺ , ¹⁰⁶Cd , 7+ , , , - , style="text-indent:1em" , ^106mIn , colspan="3" style="text-indent:2em" , 28.6(3) keV , 5.2(1) min , β⁺ , ¹⁰⁶Cd , (3+) , , , - , ¹⁰⁷In , style="text-align:right" , 49 , style="text-align:right" , 58 , 106.910295(12) , 32.4(3) min , β⁺ , ¹⁰⁷Cd , 9/2+ , , , - , style="text-indent:1em" , ^107mIn , colspan="3" style="text-indent:2em" , 678.5(3) keV , 50.4(6) s , IT , ¹⁰⁷In , 1/2− , , , - , ¹⁰⁸In , style="text-align:right" , 49 , style="text-align:right" , 59 , 107.909698(10) , 58.0(12) min , β⁺ , ¹⁰⁸Cd , 7+ , , , - , style="text-indent:1em" , ^108mIn , colspan="3" style="text-indent:2em" , 29.75(5) keV , 39.6(7) min , β⁺ , ¹⁰⁸Cd , 2+ , , , - , ¹⁰⁹In , style="text-align:right" , 49 , style="text-align:right" , 60 , 108.907151(6) , 4.2(1) h , β⁺ , ¹⁰⁹Cd , 9/2+ , , , - , style="text-indent:1em" , ^109m1In , colspan="3" style="text-indent:2em" , 650.1(3) keV , 1.34(7) min , IT , ¹⁰⁹In , 1/2− , , , - , style="text-indent:1em" , ^109m2In , colspan="3" style="text-indent:2em" , 2101.8(2) keV , 209(6) ms , , , (19/2+) , , , - , ¹¹⁰In , style="text-align:right" , 49 , style="text-align:right" , 61 , 109.907165(13) , 4.9(1) h , β⁺ , ¹¹⁰Cd , 7+ , , , - , style="text-indent:1em" , ^110mIn , colspan="3" style="text-indent:2em" , 62.1(5) keV , 69.1(5) min , β⁺ , ¹¹⁰Cd , 2+ , , , - , ¹¹¹InUsed in medical applications , style="text-align:right" , 49 , style="text-align:right" , 62 , 110.905103(5) , 2.8047(5) d , EC , ¹¹¹Cd , 9/2+ , , , - , style="text-indent:1em" , ^111mIn , colspan="3" style="text-indent:2em" , 536.95(6) keV , 7.7(2) min , IT , ¹¹¹In , 1/2− , , , - , rowspan=2, ¹¹²In , rowspan=2 style="text-align:right" , 49 , rowspan=2 style="text-align:right" , 63 , rowspan=2, 111.905532(6) , rowspan=2, 14.97(10) min , β⁺ (56%) , ¹¹²Cd , rowspan=2, 1+ , rowspan=2, , rowspan=2, , - , β⁻ (44%) , ¹¹²Sn , - , style="text-indent:1em" , ^112m1In , colspan="3" style="text-indent:2em" , 156.59(5) keV , 20.56(6) min , β⁺ , ¹¹²Cd , 4+ , , , - , style="text-indent:1em" , ^112m2In , colspan="3" style="text-indent:2em" , 350.76(9) keV , 690(50) ns , , , 7+ , , , - , style="text-indent:1em" , ^112m3In , colspan="3" style="text-indent:2em" , 613.69(14) keV , 2.81(3) μs , , , 8- , , , - , ¹¹³In Fission product , style="text-align:right" , 49 , style="text-align:right" , 64 , 112.904058(3) , colspan=3 align=center, StableTheoretically capable of spontaneous fission , 9/2+ , 0.0429(5) , , - , style="text-indent:1em" , ^113mIn , colspan="3" style="text-indent:2em" , 391.699(3) keV , 1.6579(4) h , IT , ¹¹³In , 1/2− , , , - , rowspan=2, ¹¹⁴In , rowspan=2 style="text-align:right" , 49 , rowspan=2 style="text-align:right" , 65 , rowspan=2, 113.904914(3) , rowspan=2, 71.9(1) s , β⁺ (0.5%) , ¹¹⁴Cd , rowspan=2, 1+ , rowspan=2, , rowspan=2, , - , β⁻ (99.5%) , ¹¹⁴Sn , - , rowspan=2 style="text-indent:1em" , ^114m1In , rowspan=2 colspan="3" style="text-indent:2em" , 190.29(3) keV , rowspan=2, 49.51(1) d , IT (96.75%) , ¹¹⁴In , rowspan=2, 5+ , rowspan=2, , rowspan=2, , - , β⁺ (3.25%) , ¹¹⁴Cd , - , rowspan=2 style="text-indent:1em" , ^114m2In , rowspan=2 colspan="3" style="text-indent:2em" , 501.94(3) keV , rowspan=2, 43.1(6) ms , IT (96.75%) , ¹¹⁴In , rowspan=2, (8−) , rowspan=2, , rowspan=2, , - , β⁺ (3.25%) , ¹¹⁴Cd , - , style="text-indent:1em" , ^114m3In , colspan="3" style="text-indent:2em" , 641.72(3) keV , 4.3(4) μs , , , (7+) , , , - , ¹¹⁵In Primordial radionuclide , style="text-align:right" , 49 , style="text-align:right" , 66 , 114.903878(5) , 4.41(25)×10¹⁴ a , β⁻ , ¹¹⁵Sn , 9/2+ , 0.9571(5) , , - , rowspan=2 style="text-indent:1em" , ^115mIn , rowspan=2 colspan="3" style="text-indent:2em" , 336.244(17) keV , rowspan=2, 4.486(4) h , IT (95%) , ''¹¹⁵In'' , rowspan=2, 1/2− , rowspan=2, , rowspan=2, , - , β⁻ (5%) , ¹¹⁵Sn , - , rowspan=2, ¹¹⁶In , rowspan=2 style="text-align:right" , 49 , rowspan=2 style="text-align:right" , 67 , rowspan=2, 115.905260(5) , rowspan=2, 14.10(3) s , β⁻ (99.98%) , ¹¹⁶Sn , rowspan=2, 1+ , rowspan=2, , rowspan=2, , - , EC (0.02%) , ''¹¹⁶Cd'' , - , style="text-indent:1em" , ^116m1In , colspan="3" style="text-indent:2em" , 127.267(6) keV , 54.29(17) min , , , 5+ , , , - , style="text-indent:1em" , ^116m2In , colspan="3" style="text-indent:2em" , 289.660(6) keV , 2.18(4) s , , , 8- , , , - , ¹¹⁷In , style="text-align:right" , 49 , style="text-align:right" , 68 , 116.904514(6) , 43.2(3) min , β⁻ , ¹¹⁷Sn , 9/2+ , , , - , rowspan=2 style="text-indent:1em" , ^117mIn , rowspan=2 colspan="3" style="text-indent:2em" , 315.302(12) keV , rowspan=2, 116.2(3) min , β⁻ (52.91%) , ¹¹⁷Sn , rowspan=2, 1/2− , rowspan=2, , rowspan=2, , - , IT (47.09%) , ¹¹⁷In , - , ¹¹⁸In , style="text-align:right" , 49 , style="text-align:right" , 69 , 117.906354(9) , 5.0(5) s , β⁻ , ¹¹⁸Sn , 1+ , , , - , style="text-indent:1em" , ^118m1In , colspan="3" style="text-indent:2em" , 100(50)# keV , 4.364(7) min , β⁻ , ¹¹⁸Sn , 5+ , , , - , style="text-indent:1em" , ^118m2In , colspan="3" style="text-indent:2em" , 240(50)# keV , 8.5(3) s , , , 8- , , , - , ¹¹⁹In , style="text-align:right" , 49 , style="text-align:right" , 70 , 118.905845(8) , 2.4(1) min , β⁻ , ¹¹⁹Sn , 9/2+ , , , - , rowspan=2 style="text-indent:1em" , ^119m1In , rowspan=2 colspan="3" style="text-indent:2em" , 311.37(3) keV , rowspan=2, 18.0(3) min , β⁻ (94.4%) , ¹¹⁹Sn , rowspan=2, 1/2− , rowspan=2, , rowspan=2, , - , IT (5.6%) , ¹¹⁹In , - , style="text-indent:1em" , ^119m2In , colspan="3" style="text-indent:2em" , 654.27(7) keV , 130(15) ns , , , 1/2+, 3/2+ , , , - , ¹²⁰In , style="text-align:right" , 49 , style="text-align:right" , 71 , 119.90796(4) , 3.08(8) s , β⁻ , ¹²⁰Sn , 1+ , , , - , style="text-indent:1em" , ^120m1In , colspan="3" style="text-indent:2em" , 50(60)# keV , 46.2(8) s , , , 5+ , , , - , style="text-indent:1em" , ^120m2In , colspan="3" style="text-indent:2em" , 300(200)# keV , 47.3(5) s , β⁻ , ¹²⁰Sn , 8(−) , , , - , ¹²¹In , style="text-align:right" , 49 , style="text-align:right" , 72 , 120.907846(29) , 23.1(6) s , β⁻ , ¹²¹Sn , 9/2+ , , , - , rowspan=2 style="text-indent:1em" , ^121mIn , rowspan=2 colspan="3" style="text-indent:2em" , 312.98(8) keV , rowspan=2, 3.88(10) min , β⁻ (98.8%) , ¹²¹Sn , rowspan=2, 1/2− , rowspan=2, , rowspan=2, , - , IT (1.2%) , ¹²¹In , - , ¹²²In , style="text-align:right" , 49 , style="text-align:right" , 73 , 121.91028(5) , 1.5(3) s , β⁻ , ¹²²Sn , 1+ , , , - , style="text-indent:1em" , ^122m1In , colspan="3" style="text-indent:2em" , 40(60)# keV , 10.3(6) s , , , 5+ , , , - , style="text-indent:1em" , ^122m2In , colspan="3" style="text-indent:2em" , 290(140) keV , 10.8(4) s , β⁻ , ¹²²Sn , 8- , , , - , ¹²³In , style="text-align:right" , 49 , style="text-align:right" , 74 , 122.910438(26) , 6.17(5) s , β⁻ , ^123mSn , (9/2)+ , , , - , style="text-indent:1em" , ^123mIn , colspan="3" style="text-indent:2em" , 327.21(4) keV , 47.4(4) s , β⁻ , ^123mSn , (1/2)− , , , - , ¹²⁴In , style="text-align:right" , 49 , style="text-align:right" , 75 , 123.91318(5) , 3.11(10) s , β⁻ , ¹²⁴Sn , 3+ , , , - , rowspan=2 style="text-indent:1em" , ^124mIn , rowspan=2 colspan="3" style="text-indent:2em" , −20(70) keV , rowspan=2, 3.7(2) s , β⁻ , ¹²⁴Sn , rowspan=2, (8)(−#) , rowspan=2, , rowspan=2, , - , IT , ¹²⁴In , - , ¹²⁵In , style="text-align:right" , 49 , style="text-align:right" , 76 , 124.91360(3) , 2.36(4) s , β⁻ , ^125mSn , 9/2+ , , , - , style="text-indent:1em" , ^125mIn , colspan="3" style="text-indent:2em" , 360.12(9) keV , 12.2(2) s , β⁻ , ¹²⁵Sn , 1/2(−) , , , - , ¹²⁶In , style="text-align:right" , 49 , style="text-align:right" , 77 , 125.91646(4) , 1.53(1) s , β⁻ , ¹²⁶Sn , 3(+#) , , , - , style="text-indent:1em" , ^126mIn , colspan="3" style="text-indent:2em" , 100(60) keV , 1.64(5) s , β⁻ , ¹²⁶Sn , 8(−#) , , , - , rowspan=2, ¹²⁷In , rowspan=2 style="text-align:right" , 49 , rowspan=2 style="text-align:right" , 78 , rowspan=2, 126.91735(4) , rowspan=2, 1.09(1) s , β⁻ (99.97%) , ^127mSn , rowspan=2, 9/2(+) , rowspan=2, , rowspan=2, , - , β⁻, n (.03%) , ¹²⁶Sn , - , rowspan=2 style="text-indent:1em" , ^127mIn , rowspan=2 colspan="3" style="text-indent:2em" , 460(70) keV , rowspan=2, 3.67(4) s , β⁻ (99.31%) , ^127mSn , rowspan=2, (1/2−) , rowspan=2, , rowspan=2, , - , β⁻, n (.69%) , ¹²⁶Sn , - , rowspan=2, ¹²⁸In , rowspan=2 style="text-align:right" , 49 , rowspan=2 style="text-align:right" , 79 , rowspan=2, 127.92017(5) , rowspan=2, 0.84(6) s , β⁻ (99.96%) , ¹²⁸Sn , rowspan=2, (3)+ , rowspan=2, , rowspan=2, , - , β⁻, n (.038%) , ¹²⁷Sn , - , style="text-indent:1em" , ^128m1In , colspan="3" style="text-indent:2em" , 247.87(10) keV , 10(7) ms , , , (1)− , , , - , style="text-indent:1em" , ^128m2In , colspan="3" style="text-indent:2em" , 320(60) keV , 720(100) ms , β⁻ , ¹²⁸Sn , (8−) , , , - , rowspan=2, ¹²⁹In , rowspan=2 style="text-align:right" , 49 , rowspan=2 style="text-align:right" , 80 , rowspan=2, 128.92170(5) , rowspan=2, 611(4) ms , β⁻ (99.75%) , ¹²⁹Sn , rowspan=2, 9/2+# , rowspan=2, , rowspan=2, , - , β⁻, n (.25%) , ¹²⁸Sn , - , rowspan=3 style="text-indent:1em" , ^129m1In , rowspan=3 colspan="3" style="text-indent:2em" , 380(70) keV , rowspan=3, 1.23(3) s , β⁻ (97.2%) , ¹²⁹Sn , rowspan=3, (1/2−)# , rowspan=3, , rowspan=3, , - , β⁻, n (2.5%) , ¹²⁸Sn , - , IT (.3%) , ¹²⁹In , - , style="text-indent:1em" , ^129m2In , colspan="3" style="text-indent:2em" , 1688.0(5) keV , 8.5(5) μs , , , 17/2− , , , - , rowspan=2, ¹³⁰In , rowspan=2 style="text-align:right" , 49 , rowspan=2 style="text-align:right" , 81 , rowspan=2, 129.92497(4) , rowspan=2, 0.29(2) s , β⁻ (98.35%) , ¹³⁰Sn , rowspan=2, 1(−) , rowspan=2, , rowspan=2, , - , β⁻, n (1.65%) , ¹²⁹Sn , - , style="text-indent:1em" , ^130m1In , colspan="3" style="text-indent:2em" , 50(50) keV , 538(5) ms , , , 10-# , , , - , style="text-indent:1em" , ^130m2In , colspan="3" style="text-indent:2em" , 400(60) keV , 0.54(1) s , , , (5+) , , , - , rowspan=2, ¹³¹In , rowspan=2 style="text-align:right" , 49 , rowspan=2 style="text-align:right" , 82 , rowspan=2, 130.92685(3) , rowspan=2, 0.28(3) s , β⁻ (97.8%) , ¹³¹Sn , rowspan=2, (9/2+) , rowspan=2, , rowspan=2, , - , β⁻, n (2.19%) , ¹³⁰Sn , - , style="text-indent:1em" , ^131m1In , colspan="3" style="text-indent:2em" , 363(37) keV , 0.35(5) s , , , (1/2−) , , , - , style="text-indent:1em" , ^131m2In , colspan="3" style="text-indent:2em" , 4.10(7) MeV , 320(60) ms , , , (19/2+ to 23/2+) , , , - , rowspan=2, ¹³²In , rowspan=2 style="text-align:right" , 49 , rowspan=2 style="text-align:right" , 83 , rowspan=2, 131.93299(7) , rowspan=2, 206(4) ms , β⁻ (94.8%) , ¹³²Sn , rowspan=2, (7−) , rowspan=2, , rowspan=2, , - , β⁻, n (5.2%) , ¹³¹Sn , - , rowspan=2, ¹³³In , rowspan=2 style="text-align:right" , 49 , rowspan=2 style="text-align:right" , 84 , rowspan=2, 132.93781(32)# , rowspan=2, 165(3) ms , β⁻, n (85%) , ¹³²Sn , rowspan=2, (9/2+) , rowspan=2, , rowspan=2, , - , β⁻ (15%) , ¹³³Sn , - , style="text-indent:1em" , ^133mIn , colspan="3" style="text-indent:2em" , 330(40)# keV , 180# ms , IT , ¹³³In , (1/2−) , , , - , rowspan=3, ¹³⁴In , rowspan=3 style="text-align:right" , 49 , rowspan=3 style="text-align:right" , 85 , rowspan=3, 133.94415(43)# , rowspan=3, 140(4) ms , β⁻ (79%) , ¹³⁴Sn , rowspan=3, , rowspan=3, , rowspan=3, , - , β⁻, n (17%) , ¹³³Sn , - , β⁻, 2n (4%) , ¹³²Sn , - , ¹³⁵In , style="text-align:right" , 49 , style="text-align:right" , 86 , 134.94933(54)# , 92(10) ms , β⁻ , ¹³⁵Sn , 9/2+# , , , - , ¹³⁶In , style="text-align:right" , 49 , style="text-align:right" , 87 , , 85 ms , β⁻ , ¹³⁶Sn , , , , - , ¹³⁷In , style="text-align:right" , 49 , style="text-align:right" , 88 , , 65 ms , β⁻ , ¹³⁷Sn , , ,

References

* Isotope masses from: ** * Isotopic compositions and standard atomic masses from: ** ** * Half-life, spin, and isomer data selected from the following sources. ** ** ** {{Navbox element isotopes Indium