Abstract

A method to determine the leachable content of90Sr in environmental samples has been developed and applied to samples contaminated by the Chemobyl fallout. It consists of the following main steps: (1) drying and ashing, (2) leaching, (3) extraction of90Y using HDEHP and (4) Cherenkov counting of90Y in the organic phase. The method is easy to carry out and with a careful evaluation of the radioactivity measurement, the method is reliable down to a practical detection limit of approximately 7 mBq leachable90Sr/g sample ash.

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