Preparation of copper-64, nickel-65 and manganese-56 in a high specific activity

Abstract

Preparation of some radioisotopes in a high specific activity was studied with the use of the Szilard--Chalmers effects of some metal oxinates (8- hydroxyquinolates). The experimental results obtained for copper, nickel, and manganese oxinates are given. Dehydrated oxinates irradiated in JRR-1 were dissolved in an organic solvent. The orgaric solution of oxinates was shaken with Michaelis' buffer solutions of various pH values. The extractability was calculated by comparing activities of both phases. On the other hand, the amount of metal in the aqueous phase was determined colorimetrically. Based on these values, each enrichment factor was determined. The results for copper showed that, after the organic solution was shaken with the aqueous solution having a pH of 11, the activity was about 9%, whereas the activity in l5N ammonium hydroxide solution was 15%. The enrichment factors obtained were 231 and 244, respectively. For nickel, about 81% activity was found in the aqueous solution of 0.5N sodium hydroxide solution, and an enrichment factor of 10/sup 5/ was obtained. Cobalt- 68 produced by (n,p) reaction was separated from the nickel fraction by the ion- exchange method. Manganese ion was extracted with an aqueous solution of pH 8 to 9, whereas the oxinate wasmore » kept in the organic phase. About 10% activity was found in the aqueous solution after being mixed with the organic solution. The total amount of manganese was determined from the color of permanganate. An enrichment factor of 10/sup 3/ was obtained for Mn/sup 56/. (auth)« less