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Radiological Assessment of Contaminated Soils from Selected Mechanic Sites in Ibadan, Southwestern Nigeria |
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PP: 45-52 |
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doi:10.18576/jrna/100107
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Author(s) |
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O. T. Aruna,
S. K. Alausa,
A. O. Olabamiji,
O. Ajiboye,
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Abstract |
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| The research aimed at measuring the activity concentrations and radiological impacts of human activities on soil samples from five mechanic sites around the Ibadan metropolis, Southwestern Nigeria. The activity concentrations of radionuclides in a total of twenty-five soil samples obtained from the study areas were analyzed using a single crystal NaI(TI) detector. From the study, the weighted average activity concentrations of 40K, 238U, and 232Th were 320.51±251.60, 12.49±6.17, and 10.11±5.83Bq/kg respectively. The average gamma absorbed and effective dose rates were 25.23±15.76 nGy/h and 30.94±19.23 µSv/y respectively. The mean radium equivalent value ranged between 38.05 to 83.17 (Bqkg-1) with a weighted average of 50.36Bqkg-1. All the estimated values of radiation hazard indices and representative gamma index obtained were less than one (1.0). These values and the radiological hazard indices were within the world-recommended limits by UNSCEAR. The results showed that radiological health hazards associated with radiation exposure from the study areas may not pose any serious radiological effect to the environment and public. Although human activities in the study areas influenced the increase in activity concentrations of the measured radionuclides, it could still be concluded that human exposure to radiation from the study areas poses neither short nor long-term significant health risks. |
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