Nuclides with atomic number of 49 but with different mass numbers
Isotopes of indium (49In)
Main isotopes[1]
Decay
abundance
half-life (t1/2)
mode
product
111In
synth
2.8 d
ε
111Cd
113In
4.28%
stable
115In
95.7%
4.41×1014 y
β−
115Sn
Standard atomic weight Ar°(In)
114.818±0.001[2]
114.82±0.01 (abridged)[3]
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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 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, 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, 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).[4] 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 (including indium-99) have been used to measure the mass of the doubly-magic isotope tin-100.[5][6]
^Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
^"Standard Atomic Weights: Indium". CIAAW. 2011.
^Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
^"Octreoscan review". Medscape.
^"Precision mass measurements of indium isotopes allow conclusions on the mass of the doubly-magic atomic nucleus of tin-100". GSI. 13 June 2012. Retrieved 2023-09-10.
^"Tin 100 probed by studying its neighboring isotopes, indium 99 and 101 – IJCLab". Retrieved 2023-09-10.
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