Abstract
A sample of primary cooling water taken from the stainless steel loop facility of JRR-1 on May 9, 1959, had gamma activities of about 10-4μc/ml.The gamma spectrum of the sample showed peaks at 0.32, 0.51, 0.83, 1.1 and 1.3 MeV. The separation of radionuclides was done as follows: The sample solution was dried, dissolved with 11.4N hydrochloric acid, and transferred to a Dowex 1 (H type) anion exchange resin column bed (∅ 1cm, h 10cm, 100200 mesh). The nuclides absorbed on the column were successively eluted with acid solutions of decreasing acidities (11.4, 6.0 and 3.0N hydrochroric acid) to separate fractions of nickel, manganese, cobalt and iron.The gamma activties of the frations were measured with a 256 channel pulse hight analyzer. The nuclides were identified by their gamma energie, chemical properties and half-lives, which are given in Table l as well as the probable ways of formation.
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