A rapid procedure for the determination of 230Th In mid tailings by a spectrometry following lithium metaborate fusion and purification by solvent extraction has been developed. The source for a spectrometry Is prepared by coprecipitation with cerium fluoride. The procedure has been applied to samples collected at Department of Energy remedial action sites, demonstrating an accuracy of 2.5 % and a precision of 5 %. The detection limit Is 0.3 pCI/g. With this procedure, a single analyst can analyze 15 samples/day.

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