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A low cost in-situ gamma-ray spectrometric method for rapid assessment of radiation exposure, identification of radionuclides and detection of changes in environmental radioactivity has been employed in the determination of the natural gamma radiation dose levels in six major cities of the southeastern region of Nigeria. The soil radioactivity concentrations of the primordial radionuclides; 40 K, 238 U and 232 Th were determined and have been related to the γ -dose rates in the cities. The activity concentration of 40 K across the region ranged between 0.021 and 0.200 kBq kg –1 ; 238 U was between 0.001 and 0.066 kBq kg –1 while that of 232 Th ranged between 0.015 and 0.103 kBq kg –1 . The total γ -absorbed dose rates in air in the region ranged between 0.016 and 0.090 μ Gy h –1 with a mean of 0.039 ± 0.018 μ Gy h –1 . The mean of the annual outdoor effective dose due to the terrestrial gamma radiation for the region was calculated as 50 μ Sv y –1 representing 66% of the world average value.

radioprotection

Application ofin-situgamma-ray spectrometry in the determination of activity concentrations of40K,238U and232Th and mean annual effective dose rate levels in southeastern cities in Nigeria