ASSESSMENT OF NATURAL RADIOACTIVITY AND ITS ASSOCIATED RADIOLOGICAL HAZARD INDICES AND DOSE PARAMETERS IN SOIL SAMPLES FROM COASTAL COMMUNITIES OF OKRIKA, NIGERIA
Abstract
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.
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ISSN: 978-37967
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