抄録
The conditions under which curium can be separated from irradiated 241Am target were elucidated. The isolation process consists of three steps: In the first step, Am(III) is oxidized to pentavalent state in a dilute nitric acid solution, and then plutonium and curium are extracted from the irradiated target by solvent extraction with HDEHP. Curium in the organic phase is back-extracted with 1N nitric acid, and thereafter plutonium with a reducing solution containing ferrous sulfamate. The curium is finally purified by cation exchange, using α-hydroxy isobutyrate as the eluting solution. About 0.4μg of 242Cm and 4×10-3μg of 243Cm were found in the curium fraction, which had been separated from 1mg of irradiated 241Am sample.
