Granite Radiological hazards Dose parameters a b s t r a c t Gamma ray spectra of natural radioactivity from 238 U-and 232 Th series and from 40 K of eight (representing 40 collected samples) granite samples collected from Saint Katherine region, South Sinai, Egypt, had been measured using a gamma-ray spectrometer with an HPGe detector. The results reported in the present article include: Specific activities (A) of 226 Ra, 232 Th and 40 K radionuclides, Radium equivalent activities (Ra eq ), external and internal hazard indices (H ext , H int ), external and internal level indices (I g , I a ), activity utilization index (I), exposure rate (ER) and other important parameters to the subject. The results have been presented in table graphs with the permissible maximum limits.
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