UNIHEZ JOURNAL OF CONTEMPORARY RESEARCH

Nine (9) Coastal communities of Okrika Local Government Area of Rivers State was assessed, in each of the community two soil samples were obtained, giving a total of Eighteen (18) samples. These samples were Analysed using NaI(Ti) Gamma-Ray Spectroscopy at the Nigerian Nuclear Regulatory Authority. The mean values of the activity concentration of the radioisotopes varied 73.63 -128.18 with a mean value of 121.87±50.53, 2.60 to 27.05 with mean value of 10.14±7.28 and 4.59 to 7.45 mean value of 6.32±1.03 for 40K,238U and 232Th respectively. The Gamma index ranged from 0.06 to 0.24 with a mean value of 0.122±0.05. The external hazard (Hex) ranged from 0.04 to 0.14 with mean value of 0.08±0.03. The internal hazard (Hin) varied from 0.05 to 0.13 with mean value of 0.10±0.05. The absorbed dose varied from 7.04 nGy/h to 25.5 nGy/h with mean value of 13.58±5.47. The annual effective dose equivalent varied from 0.01 mSv/y to 0.03 mSv/y with mean value of 0.02±0.01 mSv/y. The gonadal dose varied from 50.34 to 179.45 mSv/y with mean value of 96.02±38.30 mSv/y. The excess life cancer risk ranged from 0.03x10- 3 to 0.11x10-3 with a mean value of 0.06±0.02x10-3 . The activity Utilization index ranged from 0.09 to 0.34 with a mean value of 0.18±0.07. The Radiological Hazard Indices and Dose Parameters are within the safe limits. Therefore, the populace of the study area is radiologically free, and soil samples of the Coastal communities of Okrika can be utilize as building materials.