RAPID METHOD FOR THE DETERMINATION OF SR- 90 IN NATURAL-WATERS

A novel, relatively simple procedure has been developed for the determ ination of Sr-90 in natural aqueous samples. The method is based on th e assumption that the radiochemical equilibrium is already established in the sample. Then the daughter element of Sr-90, the Y-90 is separa ted and its activity measured. The separation of Y-90 in aqueous solut ion is based on the selective ion-exchange behaviour of the mixture of yttrium-oxalate and yttrium-ammonium-oxalate salts. In this paper the preparation of the mixture, the selectivity experiments, the technica l procedure of the method are described and results of the first testi ng measurements are given.