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238 U, 232 Th, 226 Ra, and 40 K radioactivities were determined in commercial granite samples collected from local market using a NaI (Tl) gamma-ray spectroscopy system. 238 U, 232 Th, 226 Ra, and 40 K activity concentrations of the studied commercial granites range between 31 and 351.33 BqKg -1 , 22.2 to 102.35 BqKg -1 , 22.2 to168.35 BqKg -1 and 881.49 to 1460.67 BqKg -1 , respectively. The highest values of activity concentrations of 238 U, 226 Ra and 40 K were recorded in Lahm Mafroumdoi:10.21608/nssj.2015.30836 fatcat:2wvupha3pzaj7bjl3m22eupiuu