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Radioactivity concentrations and dose assessment for bitumenand soil samples around a bituminous deposit in Ondo State, Nigeria

Published online by Cambridge University Press:  15 September 2010

J.A. Ademola  and
S. Ademonehin
J.A. Ademola
Affiliation:
Department of Physics, University of Ibadan, Ibadan, Nigeria
S. Ademonehin
Affiliation:
Department of Physics, University of Ibadan, Ibadan, Nigeria
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Abstract

Bitumen samples and soil samples around a bituminous deposit in Ondo State, Nigeria, wereanalysed for 40K, 226Ra and 232Th employing gamma-rayspectrometry. The activity concentrations of 40K, 226Ra and232Th in soil varied from (45.2 ± 5.3) to (484.2 ± 25.9), BDL (belowdetectable limit) to (27.7 ± 2.1) and (22.8 ± 2.7) to (62.4 ± 6.8) Bq.kg-1,respectively. The corresponding mean values were (240.2 ± 133.5), (13.3 ± 8.0) and (40.0 ±10.2) Bq.kg-1, respectively. The mean activity concentrations of theradionuclides in the bitumen were (58.4 ± 36.4), (16.1 ± 13.3) and (32.5 ± 13.1)Bq.kg-1, respectively, for 40K, 226Ra and232Th. The mean absorbed dose and effective dose for the soil samples were(41.5 ± 8.9) nGy.h-1 and (50.7 ± 10.9) μSv.y-1, respectively, whilethose of the bitumen samples were (29.5 ± 15.6) nGy.h-1 and (36.1 ± 19.1)μSv.y-1, respectively. For radiological hazard assessment, the radiumequivalent activity and the external hazard index were determined. The values of theradium equivalent activity and external hazard index obtained for the soil and bitumensamples were lower than the recommended limit.

Keywords

Activity concentrationnatural radionuclidesdose assessmentbitumensoilNigeria
Type
Article
Information
Radioprotection , Volume 45 , Issue 3 , July 2010 , pp. 359 - 368
Copyright
© EDP Sciences, 2010

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