Abstract
A new procedure was developed for the separation of uranium, thorium, plutonium, neptunium and americium based on extraction chromatography using the N,N,N′,N′-tetraoctyldiglycolamide sorbed onto Amberchrom CG-71 (available as DGA resin® from Triskem International). Radioactive waste samples were wet ashed, actinides were preconcentrated by coprecipitation with ferrous hydroxide. The dissolved precipitate was loaded from a reductive media on the column and the actinides were sequentially eluted changing the nature and the acidity of the eluents, the oxidation states of the given actinides, the concentration of the complexing agent, and the temperature. Alpha sources were prepared by micro-coprecipitation from the strip solutions without further processing. High recoveries and decontamination factors were obtained in each alpha source.
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