Preparation of Uranium-233 with Low Uranium-232 Content
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概要
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Thorium dioxide, previously freed of uranium and protactinium contamination by means of ion-exchange, was irradiated for 70.5 and 140 hr respectively in the core and graphite thermal column positions of the KUR (Kyoto University Reactor). After being cooled for more than 11/2yr, the <SUP>233</SUP>U produced was chemically purified by ion exchange, and the resulting <SUP>223</SUP>U specimens were electro-deposited on a stainless steel plate for submission to a-spectrometric measurement with a silicon surface barrier detector. From the α-spectra thus obtained, the <SUP>232</SUP>U to <SUP>233</SUP>U atomic ratios of the specimens were evalu-ated and compared with the calculated values. This revealed that the rate of formation of <SUP>232</SUP>U depended largely on the 232Th(<I>n, 2n</I>)231Th reaction by fast neutrons, and conse-quently, on the neutron energy distribution prevailing at the position of irradiation. The purest <SUP>233</SUP>U sample obtained from the thorium target, irradiated with pure thermal neu-trons in the graphite thermal column, yielded a <SUP>232</SUP>U to <SUP>233</SUP>U atomic ratio of 3.02×10<SUP>-9</SUP>, which corresponded to 6.62 × 10<SUP>-6</SUP> in α-activity ratio.
- 一般社団法人 日本原子力学会の論文
著者
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Kobayashi Katsuhei
Research Reactor Institute Kyoto Uninversity
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Yamamoto Masayoshi
Department Of Bioresources Science Kochi University
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Hashimoto Tetsuo
Department Of Biosystems Science Graduate University For Advanced Studies (sokendai)
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YAMAMOTO Masayoshi
Department of Chemistry, Faculty of Science, Kanazawa University
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