Ion exchange determination of strontium-89 and strontium-90 in milk: collaborative study

Abstract Eleven collaborators performed a second collaborative study of an ion exchange method for determining strontium-89 and -90. For milk containing 29.0 and 197 pCi/L of strontium- 89, the results at 2 levels were: average 31.0, 199.6; range 26-36, 164-290; standard deviation 2.9, 7.2; and per cent error 10.0, 3.4. For milk containing 32.4 and 151.2 pCi/L of strontium-90, the results were: average 32.5, 149.9; range 27.2-38.0, 125.3-170.3, standard deviation 0.32, 4.17; and per cent error 0.9, 2.8. The method has been adopted as official first action.