Abstract
A new method is presented for determination of uranium and thorium contents in solid samples by gamma-ray spectrometry. The analytical procedure involved determination of uranium via the 63.288 keV gamma emission of its daughter 234Th and thorium on the basis of 238.578 keV 212Pb peak. The radiochemical equilibrium was assumed. Geometry effects and exact self-absorption were taken into account by measurements of sample linear absorption coefficients and calculation of effective solid angle. IAEA standards were used for determination of detector efficiency. The method provides reliable analytical measurements even for samples much different from standard reference materials in density and gamma absorption.
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