ABSTRACTudNaturally occurring radionuclides have different amount of activity concentration forud226udRa, ud232udTh udand ud40udK in building materials. In this study, natural radioactivity has been measured for bricks used in udTehran. For this work, 9 samples of three types of bricks, clay brick (CB), making the facade brick ud(MFB) and firebrick (FB) has been selected from different regions and factories in Tehran. Gamma rays udanalyzed by high purity germanium (HPGe) detector and spectroscopy system. As the results show, the udmaximum value of the mean ud226udRa, ud232udTh and ud40udK for clay brick has been 17, 9 and 422Bq/kg udrespectively. Maximum of radium equivalent activities (Raeq) were calculated 62.81Bq/kg that less than udthe level has been determined 370Bq/kg for building materials. Other type of bricks had low amountsudcompared to clay bricks. The calculation results show that the bricks are safe for inhabitants becauseudhazard indexes for gamma were below the standard was been introduced. The results of this research udcompared with other studies in different countries.
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