Abstract
Abstract Three thin metal foils of 93.15% enriched 235U (3mg each) have been irradiated with thermal neutrons at a thermal power of 500 watts, to measure the cumulative fission yield of 148Ce (T½=56s) and some other short lived fission products. Gamma spectra were collected using a 50 cm3 Ge(Li) detector and the yields were calculated using a computer code developed for calculation of cumulative fission yield by first determining the appropriate gamma ray activity as of the end of the irradiation, correcting for detector efficiency and gamma ray branching ratio, and finally, dividing by the number of fission in the sample. Fission rate was determined by fission rack method. The cumulative fission yield of 148Ce, 89Kr, 136mI, 144La, 90Kr, 139Xe, 137Xe, and 140Cs were determined.
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