Usikalu, M.R. and Maleka, P.P and Malik, M and Oyeyemi , Kehinde D. and Adewoyin, O.O (2015) Assessment of geogenic natural radionuclide contents of soil samples collected from Ogun State, South western, Nigeria. International Journal of Radiation Research, 13 (4). 355 -361.
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Abstract
Background: Natural radionuclides are always present in the environment. Human exposure to the background radia�on is inevitable. It is therefore important to assess health risk associated with these radionuclides. Materials and Methods: The distribu�on of natural radionuclides 238U, 232Th and 40K in soil samples collected from all the twenty (20) local Governments headquarter areas in Ogun state, Nigeria were determined by gamma spectroscopy using a high-purity germanium detector. The measured concentra�ons were used in es�ma�ng the radiological risk pose to people living in these communi�es. Results: The ac�vity concentra�ons measured ranged between 3 ± 1 Bqkg-1(O0a) to 27 ± 6 Bqkg-1(odeda) for 238U, 10 ± 1 Bqkg-1(O0a) to 126 ± 6 Bqkg-1(Ijebu Igbo) for 232Th and 7 ± 6 Bqkg-1(Aiyetoro) to 497 ± 1 Bqkg-1(Odeda) for 40K. The mean radium equivalent calculated was 77.6 Bqkg-1 which is lower than 370 Bqkg-1 of the world average and the hazard indices calculated were lower than unity. Conclusion: The absorbed rate and annual effec�ve dose es�mated for most of the loca�ons are in good agreement with world average values except for Akomoje, Ake-Abeokuta, Ogere, Ijebu-Igbo and Odeda.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Natural radioact ivity, absorbed dose rate, radium equivalent , hazard indices, Ogun State |
| Subjects: | Q Science > QC Physics |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Physics |
| Depositing User: | Mrs Patricia Nwokealisi |
| Date Deposited: | 28 Mar 2017 15:25 |
| Last Modified: | 28 Mar 2017 15:25 |
| URI: | http://eprints.covenantuniversity.edu.ng/id/eprint/8046 |
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