METHOD OF PRODUCING CARRIER-FREE INDIUM-111 RADIOISOTOPE Russian patent published in 2012 - IPC G21G1/00 

FIELD: chemistry.

SUBSTANCE: method of producing carrier-free indium-111 radioisotope involves use of cadmium metal rich in cadmium-113 isotope as the target substance which is bombarded with accelerated protons. The target substance is separated through sublimation of the target in a hydrogen atmosphere. Cadmium is trapped in the deposition zone and non-volatile products are collected on a quartz surface. The obtained radioactive sample is placed in the start zone of a quartz thermo-chromatographic column, subjected to high-temperature chemical treatment in the presence of a reagent with transportation of the formed volatile compounds and subsequent deposition thereof on the walls of the thermo-chromatographic column at defined temperatures. The reagent used is tellurium vapour.

EFFECT: invention increases radiochemical purity of the indium-111 radioisotope, and also enables recycling of enriched cadmium.