摘要: An improved method is described for the determiation of uranium in plutonium metal and plutonium compounds using x-ray fluorescence following two anion-exchange separations. Uranium (as the chloride complex) is first separated fro... 展开 An improved method is described for the determiation of uranium in plutonium metal and plutonium compounds using x-ray fluorescence following two anion-exchange separations. Uranium (as the chloride complex) is first separated from most of the 500-mg plutonium sample using anion-exchange resin in glass columns with 8M HCl and ascorbic acid. The eluate solution from this separation contains uranium as (UO sub 2 Cl sub 3 ) exp - , Pu exp +3 , and a small amount of Pu exp +4 . This solution is dried and redissolved in 8M HCl and ascorbic acid to reduce the Pu exp +4 to Pu exp +3 ; it is then pipetted onto filter paper impregnated with anion-exchange resin. The plutonium is washed from the resin filter paper with 8M HCl, leaving uranium adsorbed on the paper. The L/sub alpha 1/ x-ray line for the uranium is measured and compared to standards. The precision is 4% relative standard deviation for the concentration range from 5 to 200 mu g uranium. The minimum detection limit is 1 mu g uranium. (ERA citation 08:021215) 收起