International Journal of Science and Technology

International Journal of Science and Technology>> Volume 7, Number 2, February 2017

International Journal of Science and Technology


Natural Radioactivity Associated with Mining of Rare Metal Pegmatite of Oke-Ogun Field, Sepeteri, Southwestern, Nigeria

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Author(s) I. A. Tubosun, P. Tchokossa, G.A. Okunlola, F.A. Balogun, M.K. Fasasi, S. Ekhaeyemhe
On Pages 350-356
Volume No. 3
Issue No. 10
Issue Date October, 2013
Publishing Date October, 2013
Keywords Radioactivity, Mining, Hazards, Gamma Spectrometry


Abstract


Within and around major cities of Southwestern Nigeria, there are scores of mining activities whose constitute menace into the immediate environments. In this study, a combined techniques using a portable survey meter (Gamma-Scout SN 038439) for in-situ investigation and a well-calibrated NaI(Tl) detector system were used for the measurement of the average radioactivity concentration in some rocks associated with mining of rare metal pegmatite of Oke-Ogun field, Sepeteri, Oyo state of Nigeria. The average dose rate obtained for gamma and beta exposure vary between 0.1 0.24 ?Sv hr-1 with a mean of 0.18 ?Sv/hr and between 0.01 0.08 ?Sv/hr with a mean of 0.03 ?Sv hr-1 respectively. With the exception of 40K and the anthropogenic 137Cs, all the radionuclides detected are traceable to the pre-medial series of 238U and 232Th. The specific activity value obtained for 238U, 232Th and 40K varied from 26.06 to 97.10 Bq kg-1 with a mean value of 58.04 12.78 Bq kg-1, 17.65 to 85.65 Bq kg-1 with an average of 29.04 9.49 Bq kg-1 and 194.87 to 1035.56 Bq kg-1 with an average of 586.23 88.56 Bq kg-1 respectively. The mean value obtained for the Representative levels index (I?), the radium equivalent (Raeq), the total absorbed dose rate (ADR) were 1.07; 144.71 Bq kg-1 and 68.80 nGy h-1 respectively. The discrepancies of our data can be attributed to several factors such as geological formation, transport process, etc. Although our results are just some fractions of the international standard limit, but still within the same ranges when compared with those obtained elsewhere. This results also will serve as a baseline data for future investigations.

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