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The gamma spectrometric analysis of different brands of cement consumed in Nigeria has been carried out in this study. Samples of 12 brands of grey Ordinary Portland Cement (OPC) and 5 brands of white cement of six samples each were collected and analysed for their radiological content using gamma spectrometry method. The average value of 226 Ra, 232 Th, and 40 K for OPC is 30.2+1.0.4Bqkg -1 , 24.6+7.1Bqkg -1 , and 251.3+27.6Bqkg -1 respectively and the average value for the white cement is 41.9+16.7Bqkg -1 , 30.1+9.4Bqkg -1 and 340.2+77Bqkg -1 respectively. The total average content of 226 Ra, 232 Th, and 40 K for all the cement brand samples are 36.1+13.6Bqkg -1 , 27.4+8.3Bqkg -1 , and 295.8+32.7Bqkg -1 respectively. These values obtained are lower when compared to the world average values (50, 50 and 500 Bqkg -1 ) for building materials. The estimated radium equivalent activities (Raeq), representative index (Iγ), average absorbed γ-dose rate (D), the annual effective dose rate (AEDE), annual gonadal dose equivalent (AGDE) external and internal hazard indices and the Excess life cancer risk (ELCR) were lower than the recommended safe limit and are comparable with results from similar studies conducted in other countries. The evaluated mean gonadal dose equivalents of three cement brand samples were fund to be higher than the world average for building material while others are less than the world average.

Assessment of Natural Radionuclide Content of Common Brands of Cement Used in Nigeria