4.1 Article

Spatial distribution of gamma radiation dose rates from natural radionuclides and its radiological hazards in sediments along river Iju, Ogun state Nigeria

Journal

METHODSX
Volume 7, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.mex.2020.101086

Keywords

Soil sediment; Iju River; Gamma spectroscopy; Radioactivity; Radiological parameters; Excess lifetime cancer risks; Multivariat analysis

Funding

  1. Covenant University through Covenant University Center for Research Innovation and Discovery (CUCRID) research Grant scheme [CUCRID/VC/17/02/02/06-FS]

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This study assessed the radioactivity level of Iju River sediments and its associated radiological risks exposure to human. Gamma absorbed dose rates were measured using a portable gamma spectrometer at an interval of 50 m between each point (Model No:RS-125 manufactured by Canadian Geophysical Institute). The measured absorbed gamma dose rates range from 22 to 59 nGy/h with the highest value noted in site 13. The mean activity concentrations of U-238, Th-232 and K-40 from Iju river sediments were 24.1 +/- 0.4 Bq/kg, 35.2 +/- 1.1 Bq/kg and 501.0 +/- 11.1 Bq/kg, which were lower than the world average values of 32 and 45 for U-238 and Th-232 by 25% and 21% and higher than 412 Bq/kg for K-40 by a factor of 0.22 (22%). This highest value of K-40 found in site 6 may be due to the presence of feldspartic minerals buried in the sediments. Consequently, the radiological hazard indices were below the permissible limits except the mean value of 28 x 10(-2) for excess lifetime cancer risk (ELCR) for the samples collected in site 6, which is higher than the average world value of 0.29 x 10(-3) by a factor of 0.03. The regression model indicates that Th-232 attributes more radioactivity impacts on the soil sediments than the contributions of U-232 and K-40, as such, presumed to be the radionuclide parameter controlling the depositional process in the region. (C) 2020 The Author(s). Published by Elsevier B.V.

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