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Abstract
A method for determining activity of 89Sr and 90Sr in a sample where 90Sr and 90Y are not in equilibrium is presented. The method consists of an experimental design and equations for accurately calculating activity of 89Sr and 90Sr based on 90Y particle counts and the total counts of particles emitted from 89Sr, 90Sr, and 90Y in a sample. The equations are derived based on chemical separation sequences, particle counting sequences, and the Bateman equation. The presented method allows simultaneously obtaining the activity of 89Sr and 90Sr in a non-equilibrated 90Sr/90Y system without the need of Cerenkov counting.
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