Natural Radioactivity Levels in Rocks from Ogun State
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Natural radioactivity levels of 232Th, 238U and 40K in rock samples collected from
selected locations in Ogun State was determined using Nal (Tl) detector. The mean
radioactivity levels of 232Th, 238U and 40K were found to be 1626, 11.34 and 60 81 Bqkg-1,
respectively. The mean values of the absorbed dose rate, annual 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-l and 67.11 Bqkg-1 respectively.
Keywords
QC Physics