Abstract

A method has been developed for determining the radioactive concentration of 89Sr and 90Sr in samples, using the 90Y growth curve and the 89Sr and 90Sr decay curves. Experimental data are obtained by successive counts of the sample activity as measured by a gas-flow proportional counter. Least squares fits are then made to the theoretical curves. A discussion is given of the number of measurements needed and the most suitable dates for making them relative to the radiochemical separation date of the strontium.

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