Radionuclide Content and Risk Assessment of some Environmental Samples from Gold Mines at Mokuro-Ile-Ife, Osun State, Nigeria
DOI:
https://doi.org/10.24203/ajas.v7i3.5786Keywords:
Radionuclide content, environmental samples, gold minesAbstract
Mining and processing of natural resources has being in existence from the beginning of early years with little or no consideration to the possible radiation and contamination being posed into the environment. Using NaI (TI) gamma ray spectrometer, the activity concentration of naturally occurring radionuclides were determined in soil, rock and water samples from Mokuro gold mines in Osun State, Nigeria. The average activity concentrations of  40K, 238U and 232Th in soil samples were 362.39 ± 83.88, 21.42 ± 6.68 and 17.99 ± 6.68 Bq/kg while in rock samples were 412.62 ± 91.18, 24.61 ± 8.58 and 19.40 ± 6.76 Bq/kg respectively.  For water samples, the mean activity concentrations were in the range of 8.65 ± 4.16 Bq/L, 7.71 ± 3.42 Bq/L, and 102.44 ± 30.50 Bq/L respectively. The annual effective dose contributed by 238U, 232Th and 40K varied from 0.84mSv/y to 0.93mSv/y with an average value 0.88 mSv/y while 232Th varied from 0.018 mSv/y to 0.020 mSv/y with average value 0.019 mSv/y and 40K varied from 0.22 mSv/y to 0.25 mSv/y with an average value 0.233 mSv/y. The 238U contribution to the Annual Effective Dose was very high compared with 232Th and 40K.. The calculated mean of absorbed dose (ADR), Annual Effective Dose (AED), Radium equivalent dose rate (Raeq), Internal and External Hazard Indices in the study area were less than the world averages and the limit recommended by ICRP for all water samples. The data obtained provided the baseline concentration and also indicated that continuous exploration could lead to contamination and eventually be hazardous. .
References
• Abbady, A., (2005). Assessment of the natural radioactivity and its radiological hazards in some Egyptian rock phosphates. Indian Journal of pure andapplied physics. Vol.43,July 2005, pp.489-493.
• Ademola, J. A. & Ademonehin, S. (2010). Radioactivity concentrations and dose assessment for bitumen and soil samples around bituminous deposit in Ondo state, Nigeria. Radioprotection, 45, pp. 359-368.
• Ademola, A. K., Hammed, O. S., &Adejumobi, C. A. (2008).Radioactivity and dose assessment of marble samples from Igbeti mines, Nigeria. Radiation Protection Dosimetry, 132(1), pp 94-97.
• Ademola, A. K., & Obed, R. I. (2012). Gamma radioactivity levels and their corresponding external exposure of soil samples from Tantalite mining areas in Oke-Ogun, South-Western Nigeria. Radioprotection, 47, pp. 243-252.
• Amrani, D & Tahtat, M. (2001).Natural radioactivity I Algeria building materials. Applied Radiation and Isotopes, 54, pp. 687-689.
• Berekta, J and Mathew, P.J (1995).“ Natural Radioactivity of Australinebuldingmaterials, industrial wastes and by-products. Health Physics, 48, pp. 87-95.
• El Afifi, (2006)., Evaluation of U, Th, and emanated radon in some NORM and TENORM samples. Radiation measurements, Vol 41, pp. 627-633.
• Faanu, A., Darko, E. O., & Ephraim, J. H. (2011).Determination of natural radioactivity and hazard in soil and rock samples in a mining area in Ghana. W. Afr. Journal of Applied Ecology, 19, pp.77-92.
• Ferreira da Silva, E., Zhang, C., Serrano Pinto, L., Patinha, C. & Reis, P. (2004).Hazard Assessment of arsenic and lead in soils of Castromil gold mining area, Portugal. Applied Geochemistry, 19 (6); pp. 887-898.
• IAEA.(1996). International Basic Safety Standards for Protection against Ionising Radiation and for the safety of radiation sources, Safety Series No. 115, IAEA, Vienna.
• ICRP. (2007). 2006 recommendations of the International Commission on Radiological Protection, ICRP Publication 103, Pergamon Press, Oxford.
• Innocent, A. J., Onimisi, M. Y., & Jonah, S. A. (2013). Evaluation of naturally occurring radionuclide materials in soil samples collected from some mining sites in Zamfara State, Nigeria. British Journal of Applied Science &Technology, 3(4), pp. 684-692.
• Isinkaye M.O., (2013). Natural radioactivity levels and radiological health implications of tailings enriched soil and sediments around two mining sites in Southwest Nigeria. Radiaton Protection and Environment. 36 (3), pp. 122.
• Manlanca, A., Pessina, V., & Dallara, G. (1993).Radionuclide content of building materials and gamma ray dose rates in dwellings of Rio-Grate-Do-Notre Brazil.Radiation Protection Dosimetry, 48, pp.199-203.
• Tchokossa, P., Olomo, J. B. and Osibote, O. A. (2006). Radioactivity in the community water supplies of Ife–Central and Ife-East local government areas of Osun State, Nigeria. Nucl.Instrum.Methods Phys. Res.A 422, pp.784–789.
• United Nations Scientific Committee on the Effects of Atomic Radiation. (2000).“Sources, effects and risks of ionization radiationâ€, United Nations Scientific Committee on the Effects of Atomic Radiation, Report to the General assembly, with Annexes, New York.
• United Nations Scientific Committee on the Effects of Atomic Radiation (2000), Sources of Ionizing Radiation. H. Vanmarcke. SCK•CEN, Department Stralingsbeschermingsonderzoek, Boeretang 200, B-2400 Mol, België
• World Health Organisation, “Guidelines for Drinking Water Quality,†2nd Edition, Vol. 1, 1993, pp. 114-121.
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