الفهرس | Only 14 pages are availabe for public view |
Abstract In this work, trials for the production of the medically and technologically interesting ‘39Ce and ‘42Pr radionuclides through cyclotron irradiations using protons and alpha particles were studied. The radiochemical separation of no~carrier-added cerium from proton irradiated lanthanum was studied by solvent extraction using ~. DEE, TBP and TPPO, the latter reagent being employed for the first time •for separation of radiocerium from bulk of lanthanum. Distribution coefficients of cerium and lanthanum were investigated as a function of equilibrium time and HNO3 concentration. A mixture of 0.05 M K2Cr2O7 ¶ and 0.1 M H2S04 was used as an oxidizing agent to improve the separation efficiency of cerium. A comparative study of the three extractants released that DEE is the best for separation of cerium from hulk of lanthanum oxide. The target was prepared by pressing. The production of 139Ce of high radionuciidic and chemical purity via irradiation of lanthanum oxide target at MGC-20 cyclotron with protons * of energy 14.5 is described. The experimental yield was found to be 153 kBq/[tA~h. |