Caroline Nihinlola Iwetan, Ibiyinka Agboola Fuwape, Adeseye Muyiwa Arogunjo, Ganiyu Obor
Activity concentrations of twenty-six (26) samples of sediment collected from rivers from eleven (11) oil-producing communities and two (2) non-oil producing communities in Delta state of Nigeria
were studied. Hyper Purity Germanium (HPGe) Detector was used for counting and detection of radionuclide content of all samples. Results of the samples analysed showed that the radioactivity concentrations of K40, Th232 and U238 in the sediment samples from oil-producing areas range from 32.47 Bq∙kg−1 to 525.1 Bq∙kg−1 with an average of 302.15 Bq∙kg−1, 6.31 Bq∙kg−1 to 19.33Bq∙kg−1 with an average of 11.66 Bq∙kg−1, and 4.45 Bq∙kg−1 to 18.69 Bq∙kg−1 with an average of 8.66Bq∙kg−1 respectively. Activity concentrations at the control site ranged from 3.15 Bq∙kg−1 to 4.80
Bq∙kg−1, 2.27 Bq∙kg−1 to 4.18 Bq∙kg−1 and 1.15 Bq∙kg−1 to 1.76 Bq∙kg−1 for K40, Th232 and U238. These values are within the world average; natural radioactivity mapping of the study area is carried out using the Surfer software. Statistical analysis of the results showed that there is a significant difference between the radionuclide concentrations of the sediment samples from rivers in the oil producing site compared to results from non-oil producing communities, except for one of the oil producing site samples (Idumuesah) which has values that are close to those from the control sites for K40. The values of the radiological assessment indices obtained were observed to be within the permissible maximum values; hence the radiation hazard at study areas are negligible. However, concentration values of studied radionuclide at the oil-producing study areas were observed to be higher than values from the non-oil producing sites in most cases.
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17th April, 2018
17th April, 2018