الفهرس 
IntroductionOnly 14 pages are availabe for public view
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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.