Radioactivity concentrations and dose assessment for bitumen and soil samples around a bituminous deposit in Ondo State, Nigeria
Year: 2010
Type: article
Abstract: Bitumen samples and soil samples around a bituminous deposit in Ondo State, Nigeria, were analysed for 40K, 226Ra and 232Th employing gamma-ray spectrometry. The activity concentrations of 40K, 226Ra and 232Th in soil varied from (45.2 ± 5.3) to (484.2 ± 25.9), BDL (below detectable 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 the radionuclides in the bitumen were (58.4 ± 36.4), (16.1 ± 13.3) and (32.5 ± 13.1) Bq.kg-1, respectively, for 40K, 226Ra and 232Th. 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, while those 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 radium equivalent activity and the external hazard index were determined. The values of the radium equivalent activity and external hazard index obtained for the soil and bitumen samples were lower than the recommended limit.
Source: Radioprotection
Authors: J.A. Ademola, S. Ademonehin
Institution: University of Ibadan
Language: English
Subfield: Radiation
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W1969886232