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Evaluation of Natural Radionuclide Content in River Sediments and Excess Lifetime Cancer Risk Due to Gamma Radioactivity
並列摘要
The objective of this study is to evaluate the radionuclides (U^238, Th^232 and K^40) content and outdoor terrestrial gamma dose rates in the Ponnaiyar river sediments to understand the radiation hazards to mankind. The determined activity concentrations of all sites are fall within the typical world and Indian average values although some extreme values are determined. To assess the radiological hazard of river sediments, the radiological hazard indices such as absorbed dose rate, annual effective dose equivalent (outdoor and indoor) (AEDE), hazard indices (H(subscript ex) and H(subscript in)), activity utilization index (I) and excess life time cancer risk (ELCR) are calculated. The radiological hazard indices are below the internationally recommended values. The last eight sampling sites have higher ELCR value.
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