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Medical Definition of Indium-111
1. A cyclotron-produced radionuclide with a half-life of 2.8049 days and with gamma ray emissions of 171.2 and 245.3 kiloelectron volts. In a chloride form, it is used as a bone marrow and tumour-localizing tracer; in a chelate form, as a cerebrospinal fluid tracer. Indium-111 chloride Indium-111 trichloride, Cl3In;used in electron microscopy to stain nucleic acids in thin tissue sections. (05 Mar 2000)