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Estimation of Radiation Risk Due to Exposure to Terrestrial Radiation | Chapter 02 | Advances in Applied Science and Technology Vol. 4

An in-situ measurement of background radiation level of Ewoi community in Ogbia Local Government Area of Bayelsa State Nigeria was done using two radiation meters (Digilert-200 and Radalert-100). Exposure ratemeasured ranged from 0.010 to 0.028 mRh-1 with mean value of 0.016 mRh-1. The mean value of absorbed dose was 128.67 nGyh-1 while the mean indoor and outdoor annual effective dose equivalents were 0.40 mSvy-1 and 0.13 mSvy-1 respectively. The mean excess lifetime cancer risk  estimated  from  both  indoor  and  outdoor  effective  doses  were  1.0  ×  10-3  and  0.33  ×  10-3 respectively.  It  was  observed  that  all  the  radiological  parameters  estimated  from  the  radiation exposure rate were higher than their world average values except the annual effective doses. The result of this study shows that Ewoi community recorded slightly high background radiation level and this may be attributed to oil and gas exploration activity in the area. The result of this work serves as radiological baseline data of the area for future studies. Considering the values obtained in this research work and the likely health impact, it is important that further  studies  be  carried  out  on  activity  concentration  of  radionuclide  on  the  soil,  water  (drinking water  resources  of  the  community),  and  food  crops  from  Ewoi  community  for  identification  of radionuclides present and their concentrations in order to quantify their radiological health implicationand ways to control it.

Author(s) Details

U. L. Anekwe
Department of Physics, Federal University, Otuoke, Bayelsa State, Nigeria.

Dr Ibe Stephen Onyejiuwaka
Department of Physics, Federal University Otuoke, Bayelsa, Nigeria.

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