Rapid analysis of unknown mixed gamma-emitters using a gamma-ray scintillation spectrometer

Abstract

A sample solution of fission products which had passed about 2 years since its arrival was measured by a gamma-ray scintillation spectrometer. And Ce-Pr-144, Ru-Rh-106 and Cs-Ba_??_-137 were identified by their photopeaks in the spectrometer scan. Further, the sample was separated into several fractions through a cation exchange resin column. The relative activities of the nuclides cited above and Zr-Nb-95 (which was identified in a fraction separated) were roughly obtained from their photopeaks of their principal gammas. Comparing the activities obtained with those of Hunter and Ballou's graph, the cooling time of the fission products was estimated about 2.5 years.