The Subcommittee on Radiochemistry is one of a number of subcommittees working under the Committee on Nuclear Science within the National Academy of Sciences-National Research Council Its members represent government, industrial, and university laboratories in the areas of nuclear chemistry and analytical chemistry The Subcommittee has concerned itself with those areas of nuclear science which involve the chemist, such as the collection and distribution of radiochemical procedures, the radiochemical purity of reagents, the place of radiochemistry in college and university programs, and radiochemistry in environmental science This series of monographs has grown out of the need for compilations of radiochemical information, procedures, and techniques The Subcommittee has endeavored to present a series that will be of maximum use to the working scientist Each monograph presents pertinent information required for radiochemical work with an individual element or with a specialized technique Experts in the particular radiochemical technique have written the monographs The Atomic Energy Commission has sponsored the printing of the series The Subcommittee is confident these publications will be useful not only to radiochemists but also to research workers in other fields such as physics, biochemistry, or medicine who wish to use radiochemical techniques to solve specific problems

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A practical process is described for the recovery of Pu23' product and unconverted Np23, from Np 237 oxide compacts irradiated in nuclear reactors at the Savannah River Plant. Three cycles of anion exchange are required to separate the Np and Pu from each other and produce nitrate solutions of each element which are

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