en Radiation Biology Radiation Biology تحقيق بديع Original Research <div style="text-align: justify;">Background: All human beings and living organisms are exposed to natural radiations on daily basis, which is mainly due to the activity concentration of primordial radionuclides ²³²Th, ²³⁸U and their products of decay together with the natural radionuclide ⁴⁰K present in the earth&rsquo;s crust. Materials and Methods: A total of 59 soil samples were collected around the banks and surroundings of the Lancaster dam using an auger at a depth of about 0.75 meters from the top surface. The samples were analysed using low background co-axial n-type High Purity Germanium (HPGe) detector of high-resolution and the resulting spectrum were analysed using Canberra Genie software. Results: This study revealed that the activity concentration values are in the order of ²³²Th <⁴⁰K<²³⁸U in all sampling sites. A statistical analysis based on Pearson correlation showed a positive correlation between the radiological parameters and the two primordial radionuclides ²³²Th, ²³⁸U and the natural radionuclide ⁴⁰K. Conclusion: This implied that the two primordial radionuclides ²³²Th, ²³⁸U and their products of decay including the natural radionuclide ⁴⁰K contribute to the emission of gamma radiation in all the locations of the study area. The calculated ²³⁸U/²³²Th concentration ratio in soils of present study was almost six times higher compared with different countries of the world.</div> Annual gonadal dose equivalent, Gamma ray spectrometer, Radiological hazards, Excess lifetime risk, Lancaster dam. 151 161 http://ijrr.com/browse.php?a_code=A-10-1-768&slc_lang=en&sid=1 R.L. Njinga njingaraymond@yahoo.co.uk 7900319475328460012741 7900319475328460012741 Yes Centre for Applied Radiation Science and Technology, North-West University, Mafikeng, South Africa, V.M. Tshivhase 7900319475328460012742 7900319475328460012742 No Centre for Applied Radiation Science and Technology, North-West University, Mafikeng, South Africa, U.U. Elele 7900319475328460012743 7900319475328460012743 No Department of Chemistry, Ibrahim Badamasi Babangida University, Lapai, Niger State, Nigeria.