Abstract
ABSTRACTThe primordial radionuclides activity concentrations (226Ra, 40K and 232Th) are measured in some granite samples in this study. The collected granite materials are analyzed with NaI(Tl) gamma-ray spectrometry. The specific activity of 226Ra, 232Th and 40K values are in range 2.60 ± 0.10 to 178.9 ± 0.6 Bq kg−1, 1.46 ± 0.10 to 162.50 ± 0.75 Bq kg−1 and 19.8 ± 0.3 to 579.7 ± 2.8 Bq kg−1 respectively. The radium’s equivalent activity, annual effective dose, absorbed dose rate, hazard index, radioactivity level index, activity utilization’s index and exposure rate are calculated for determination of radiological risk. The concentration of 226Ra (in the 71.4% of samples), 232Th (in the 71.4% of samples) and 40K (in the 14.3% of samples) in the granite samples are higher than average radioactivity concentrations of this radio-isotopes defined by ICRP (35.0, 30.0 and 400.0 Bq kg−1, respectively).
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