Separation of Antimony-125 in Fission Products

概要

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Most of the known radioactive nuclides of antimony produced by neutron irradiation of uranium have fission yields below 1% and have half-lives below 60 days. An exception is 125Sb with a half-life of 2.7yr, which raise its relative importance among the fission products with lapse of time after irradiation, and after 1 yr of cooling, its radioactivity is no longer negligible. This circumstance has led to its being separated from such sources as fall-out. No studies have so far been reported on using the nitrate system for this separation, though it is utilized in the reprocessing of spent fuel and in the dissolution of uranium samples. The pre-sent work describes a method of separating 125Sb from fission products with use made of silica gel-itric acid system, and an example of its application to the separation of 125Sb from the spent fuel of JPDR-1. The fuel was irradiated from Oct. 1963 to Sep. 1969. The amount of 125Sb measured after separation was (1.7±0.19)×10-1 mCi/gU at June 1972.
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