Determination of 90 Sr in different matrices via ion-exchange chromatography and LSC

A cation-exchange chromatographic method was utilized to isolate strontium. The interference of recovery yield, calcium and magnesium, and the interference of beta spectrum, yttrium-90, were eluted from the AG 50 W-X8 resin (NH 4 + form) by 0.02 mol L −1 DCTA at pH 6. Strontium successively was eluted with 6 mol L −1 HNO 3 . After the isolation procedure, the 2-windows method was applied to analyze 90 Sr measuring via LSC. The activities of 90 Sr obtained from the 2-windows method were in good agreement with recommended calculation method, ISO 18589-5:2009, and the average relative bias of the two methods was about 5%.