Abstract：A rapid measurement method using a handheld gamma radionuclide recogniser to rapidly measure the content of natural radionuclides in stone was proposed. The reference values of the calibration coefficients of 226Ra, 232Th and 40K in the handheld radionuclide recogniser were determined by means of the energy spectrum analysis method of the low background HPGe γ spectrometer. Then the radionuclide gamma spectrum in the stone was measured by the handheld radioisotope identification device (RID). The specific activity of 226Ra, 232Th and 40K in stone was estimated according to the calibration coefficient. The results showed that the maximum deviations between the proposed method and the low background HPGe gamma spectrometer were 25.1%(CRa), -27.2%(CTh), -15.2%(CK) respectively. The proposed method can be applied to the rapid and nondestructive detection of specific activity of gamma radiation in stone samples and the rapid estimation of external radiation dose caused by decorative stone.
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2019, Vol. 40 
