Separation of carrier-free In-111 formed in the C-12+Rh reaction

An alternative reaction route for the production of In-111 from rhodium tar get bombarded with a C-12 beam has been developed. Sulfate fusion was adapt ed for dissolution of the irradiated rhodium metal target. Indium was copre cipitated with La(OH)(3) and purified by solvent extraction of the InBr3 co mplex into di-isopropyl ether and back extraction in 6M HCl. The chemical y ield of the separation, determined using Rh-105 as tracer, was found to be above 90%. The radionuclidic purity of the separated In-111 satisfies the r equirement prescribed for radiopharmaceutical preparations. The radioactivi ty yield achieved using this route was about 0.2 MBq/mu Ah.