1963•Proc. Japan Conf. RadioisotopesRequires access
PRODUCTION OF SHORT LIVED RADIOACTIVE CESIUM
Naokazu Shibata, Hiroshi Amano, T. Kuroyanagi, Eiji Shikata, K. Tanaka, H. Ebihara, Tetsuya Tamura
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Abstract
Production methods for short-lived Cs radioisotopes were studied by using the reactions: Cs/sup 133/( gamma ,n)Cs/sup 132/, Xe(p,xn)/sup */Cs; and Ba/ sup 130/(n, gamma yields EC)Cs/sup 131/. In the ( gamma ,n) reac tion, CsCl and CsNO/sub 3/ were bombarded with gamma rays converted from 20-Mev accelerated electrons. The target was carefully assembled in irradiation to make Cs/sup 132/ a high specific activity. The specific activity of the product in 10 hr irradiation was about 10 mC/g of Cs, and the yield was about 10 mC. The radiochemical purity was more taan 99.9%. Xe gas target, of more than 99% purity, was bombanded with 16-Mev protons accelerated by a 160-cm cyclotron. The radioactive Cs nuclides produced Cs/sup 129/, Cs/sup 132/, and others were collected on a negatively charged Pt wire and separated very simply from other by products. Cs/sup 131/ activity, which was produced by pile neutron irradiation and separated by the cation exchanger method, was 99% pure with an order of 10 mC. (P.C.H.)