Correction in determination of specific activity of radionuclides by gamma spectrometry in building materials

Abstract

Abstract For more accurate determination of specific activities of radionuclides by gamma spectrometry in materials, it is necessary to take into account two important factors. These are the effect of true coincidences and self-absorption of gamma radiation directly in the measured sample. The corrections for these factors are determined for the specific measurement geometry defined by the detector, the measuring vessel and their relative positions. Corrections are calculated by Monte Carlo simulation. The results show a significant effect of material bulk density on the correction values.