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Occupational exposure to natural radionuclides due to miningactivities in Ibadan, Southwestern Nigeria

Published online by Cambridge University Press:  08 March 2010

J. A. Ademola  and
N. E. Okpalaonwuka
J. A. Ademola
Affiliation:
Department of Physics, University of Ibadan, Ibadan, Oyo State, Nigeria
N. E. Okpalaonwuka
Affiliation:
Department of Physics, University of Ibadan, Ibadan, Oyo State, Nigeria
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Abstract

The activity concentrations of potassium, uranium and thorium in minerals and soilsamples from a mining site in Ibadan, Southwestern Nigeria were measured using gamma rayspectroscopy method. Effective dose per annum has been calculated from the activityconcentrations of dominant gamma-emitting natural radionuclides, potassium, uranium andthorium. Samples collected include minerals (beryl, quartz and feldspar), soil samplesfrom the mining pits, heaps and undisturbed land around the mining site. The activityconcentrations of 40K, 238U and 232Th, respectively in Bqkg-1 in the mineral samples were as follows: 1985 ± 16, 4.8 ± 0.9 and 11.8 ±5.8 for beryl sample, 115.1 ± 27.9, 5.0 ± 1.3 and 6.3 ± 5.0 for feldspar samples and 1421± 122, <4.8 and 20.1 ± 3.5 for quartz samples. For the soil samples, the meanactivity concentrations of 40K, 238U and 232Th,respectively, were 314.2 ± 5.7, 27.7 ± 2.6 and 11.5 ± 5.9 Bq kg-1 for soilsamples from the pits and 278.1 ± 5.4, 21.1 ± 2.0 and 15.3 ± 7.5 Bq kg-1 forsoil samples from heaps. The mean activity concentrations of soil samples from theundisturbed land around the mining site were 194.3 ± 25.2, 14.5 ± 5.1 and 13.3 ± 5.9 Bqkg-1 for 40K, 238U and 232Th, respectively.The effective dose to which the miners are exposed according to exposure scenarios werecalculated as 89.9 μSv y-1 for digging and handling of soil and mineral samplesin the pit and 63.6 μSv y-1 for handling of soil and mineral samples at theheaps.

Keywords

Occupational exposurenatural radionuclideseffective dosemining
Type
Article
Information
Radioprotection , Volume 45 , Issue 1 , January 2010 , pp. 43 - 53
Copyright
© EDP Sciences, 2010

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