Two methods have been developed for rapid determination of
89Sr and
90Sr in liquid effluent from nuclear facilities. One is the sequential Cerenkov and liquid scintillation counting. The pure β emitting nuclides, freshly separated from
90Y by 0.05M TTA-Benzene extraction, are first counted for
89Sr Cerenkov radiation, and then recounted for
89Sr and
90Sr by liquid scintillation counting. The other is the simultaneous determination of
89Sr and
90Sr with spill-over method by liquid scintillation counting.
Although ingrowing
90Y may be a main cause of errors in determination of 89Sr, it can be minimized by dual radionuclides counting in Cerenkov and triple radionuclides counting in liquid scintillation. Reasonably accurate results have been obtained for samples having
89Sr/
90Sr ratio ranging from 0.05 to 20, if the countings are completed within several hours after chemical separation of
90Y.
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