Abstract
This paper describes the amount-of-substance analysis of the long-lived naturally occurring radionuclides 40K, 232Th, 235U and 238U by the method of non-destructive passive gamma-ray spectrometry. Calibrands used were standard reference materials and high-purity analytical grade chemicals. Traceability of the measured results to reference materials was established. The emission probabilities of several high-energy gamma-rays were determined. High-energy gammas were measured to decrease the effect of gamma self-attenuation.
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