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Name, symbol Indium-111,111In
Neutrons 62
Protons 49
Nuclide data
Half-life 2.8049d[1]
Complete table of nuclides

Indium-111 is an isotope of indium with a radioactive half-life of 2.80 days, making it useful as a radioactive tracer.

Among the medical applications of indium-111 are specialized diagnostic uses:

Indium-111 decays by electron capture to cadmium-111, emitting a 0.1713 and 0.2454 MeV[3] gamma rays with a 2.8047 day radioactive half-life. The parent isotope of indium-111 is tin-111, with a decay mode of electron capture. Indium-111 also undergoes isomeric transition, emitting a 0.537 MeV gamma ray with a 7.7 minute half-life.[4]

See also[edit]


  1. ^ Table of Radionuclides, Vol. 3 (PDF). Bureau international des poids et mesures. 2006. p. 75. ISBN 92-822-2218-7. Retrieved 26 June 2017. 
  2. ^ "IN-111 FACT SHEET" (PDF). Nordion(Canada), Inc. Archived from the original (PDF) on 3 December 2011. Retrieved 23 September 2012. 
  3. ^ "ENSDF Decay Data for 111-In". National Nuclear Data Center. Retrieved 17 October 2012. 
  4. ^ "Nuclide Table, Nuclide: In-111". Korea Atomic Energy Research Institute (KAERI). Retrieved 23 September 2012.