TY  - JOUR
T1  - Natural Radioactivity Levels in Rocks from Ogun State, Nigeria
AU - Usikalu, M.R. AU - Ayara, W.A. AU - Olawole, F.O. 
JO  - Journal of Engineering and Applied Sciences
VL  - 11
IS  - 12
SP  - 2651
EP  - 2655
PY  - 2016
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2016.2651.2655
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2016.2651.2655
KW  - Natural radioactivity
KW  -hazard index
KW  -rocks
KW  -radiological parameters
KW  -Ogun State
AB  - 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<sub>&#150;1</sub> , 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<sub>&#150;1</sub> , 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.
ER  -