Research of Radioisotope Production with Fast Neutrons, (VI):Preparation of Cu-67
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Copper-67, the longest-lived radioisotope of copper, was prepared by using the reaction <SUP>67</SUP>Zn(n, p)<SUP>67</SUP>Cu. Zinc enriched in <SUP>67</SUP>Zn up to 93.4% was irradiated in JRR-1 reactor for 5 hr with a fast neutron flux of 1.5×10<SUP>12</SUP> n/cm<SUP>2</SUP>/sec. Copper-67 formed in the zinc target was separated by anion exchange separation using the chioro-complex of the metals. The yield of <SUP>67</SUP>Cu and radiochemical impurity were investigated. Seventeen millimicrocuries of <SUP>67</SUP>Cu was obtained from 1 mg of zinc. No radioactive impurities other than <SUP>64</SUP>Cu were not found. Even with the use of enriched target, a more <SUP>64</SUP>Cu was produced than <SUP>67</SUP>Cu. The proportion of 67Cu to total copper radioactivity was 26% immediately after the irradiation
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