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U, Th, Ra, and K radioactivities were determined in commercial granite samples collected from local market using a NaI (Tl) gamma-ray spectroscopy system. 238 U, Th, 226 Ra, and 40 K activity concentrations of the studied commercial granites range between 31 and 351.33 BqKg, 22.2 to 102.35 BqKg, 22.2 to168.35 BqKg and 881.49 to 1460.67 BqKg, respectively. The highest values of activity concentrations of U, Ra and K were recorded in Lahm Mafroum commercial granites. High radioactivity of Lahm Mafroum is attributed to the presence of meta-autonite, zircon, allanite, monazite, sphene and apatite. Absorbed Dose Rate (D), annual effective dose equivalent (AEDE), radium equivalent activity (Raeq), external (Hex) and internal (Hin) hazard index, in addition to activity gamma index (Iγ) caused by gamma emitting natural radionuclide are determined from the obtained values of Ra, Th and K. Fairly, many of the studied commercial granites do not satisfy the universal standards.

NATURAL RADIOACTIVITY MEASUREMENTS IN LOCAL AND IMPORTED COMMERCIAL GRANITES USED AS ORNAMENTAL STONES