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Activity concentrations of natural radionuclides in Boumerzoug River sediment (the main tributary of Rhumel river) have been measured using high resolution HPGe detector. The activity concentrations of the samples were range from 16.662.32 Bq/kg to 43.484.03 Bq/kg with mean value of 26.641.33 Bq/kg for 226 Ra, 20.011.98 Bq/kg to 32.713.85 Bq/kg with the mean value 25.951.46 Bq/kg for 232 Th and 81.7033.59 Bq/kg to 259.2038.80 Bq/kg with the mean value 164.5011.30 Bq/kg for 40 K. These values were used to estimate the radiation hazard indices. The absorbed dose and annual effective dose were evaluated to assess the radiation risk due to the use of these sediments.

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In this study, the levels of natural and anthropogenic radioactivity in the sediment samples, collected from Beni Haroun Dam, were investigated using gamma-ray spectrometry. The results obtained for the 238 U, 232 Th series, 40 K natural element and 137 Cs anthropogenic radionuclide are discussed. To evaluate the radiological hazard of radioactivity in samples, the absorbed dose rate, the annual effective dose, the radium equivalent activity Raeq, the external and internal hazard indices Hex and Hin were calculated and presented in comparison with the data collected from different areas in the world.

Abstract. Current research paper intends to estimate the natural radioactivity levels in sediments samples collected from Beni Haroun Dam in the northeast Algeria, using high resolution HPGe detector. The mean activity concentrations values measured for the radionuclides 232 Th, 226 Ra and 40 K are 18.9 ± 1.9, 37.3 ± 2.7 and 149.9 ± 5.5 Bq/kg, respectively. The 137 Cs anthropogenic radionuclide has been observed with maximum activity concentration value of 0.8 ± 0.4 Bq/kg, which is considered an insignificant amount. In order to assess the radiological threat of gamma radiations emitted by these radionuclides on the health of the population, absorbed dose rate, annual effective dose equivalent and radiation hazard indices were had been calculated. The obtained values are compared with the world wide average ones.