Authors : M.R. Usikalu, W.A. Ayara and F.O. Olawole
Abstract: Natural radioactivity levels of 232Th, 238U and 40K in rock samples collected from selected locations in Ogun State was determined using NaI (Tl) detector. The mean radioactivity levels of 232Th, 238U and 40K were found to be 16.26, 11.34 and 60.81 Bqkg–1 , respectively. The mean values of the absorbed dose rate, annual 1 effective dose, outdoor radiation index , indoor radiation index. Radium equivalent for the area under study were determined as 26.96 nGyh-1, 0.16 mSvy-1 and 67.11 Bqkg–1 , respectively. The health hazards index obtained are 1 well below unity. The hazard parameters estimated in all the locations are within the safe limit for general public background radiation. Thus, the samples are fit for building and construction purposes without exposing the dwellers to any radiation burden.
M.R. Usikalu, W.A. Ayara and F.O. Olawole, 2016. Natural Radioactivity Levels in Rocks from Ogun State, Nigeria. Journal of Engineering and Applied Sciences, 11: 2651-2655.