Radiostrontium analytical method using crown-ether compound and Cerenkov counting and its applications in environmental monitoring.

The radiostrontium content in environmental samples was determined by chemical analysis by means of the fuming nitric acid method and ion exchange method with low-level beta counting and the newly developed method using crown-ether compound. Counting was performed with a low-background counter and a liquid scintillation counter together; the latter was the Cerenkov counting method. All results obtained by these three methods were in good agreement. The time for chemical separation of radiostrontium, using crown-ether compound, is much faster than fuming nitric acid and ion exchange methods. However, due to the high background of the liquid scintillation counter, the detection limit for Cerenkov counting is about two times higher than that for low-background counting.