Measurement of Natural Radioactivity and Assessment of Radiological Hazard Indices of Soil Over the Lithologic Units in Ile-Ife Area, South-West Nigeria.
| Autor: | Esan DT; Afe Babalola University, Ado-Ekiti, Nigeria., Ajiboye Y; Afe Babalola University, Ado-Ekiti, Nigeria., Obed RI; University of Ibadan Faculty of Science, Ibadan, Nigeria., Ojo J; Obafemi Awolowo University, Ife, Nigeria., Adeola M; Obafemi Awolowo University, Ife, Nigeria., Sridhar MK; University of Ibadan Faculty of Science, Ibadan, Nigeria. |
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| Jazyk: | angličtina |
| Zdroj: | Environmental health insights [Environ Health Insights] 2022 May 23; Vol. 16, pp. 11786302221100041. Date of Electronic Publication: 2022 May 23 (Print Publication: 2022). |
| DOI: | 10.1177/11786302221100041 |
| Abstrakt: | The distribution of natural radioactivity levels of 238 U, 232 Th, and 40 K in soils overlying the 3 lithologic units within Obafemi Awolowo University, Ile-Ife, Nigeria was investigated to characterize the gamma radiation dose distribution over the lithologies and to assess the radiation hazard due to the natural radionuclides. A thallium-doped cesium iodide detector was employed to determine the activity concentrations of 238 U, 232 Th, and 40 K in 21 soil samples. The respective average concentrations of the 3 radionuclides are 37.7, 3.2, and 245.6 Bq kg -1 for granite gneiss, 31.9, 2.8, and 241.1 Bq kg -1 for banded gneiss, and 21.1, 1.7, and 196.7 Bq kg -1 for mica schist. The average concentration of 238 U in granite gneiss lithology exceeds the world average value. The evaluated values of radiation hazard parameters including average absorbed dose rate, outdoor annual effective dose and external hazard index are below the recommended limits. The spatial distribution of the radiation hazard parameters evaluated over the lithologies has been delineated. The highest average cancer risk of 1.15 per 10 000 population was obtained for the study area within the soil overlying the banded gneiss lithology. Generally, the radiation hazard from the soils in study area poses no significant health hazard. Competing Interests: Declaration of Conflicting Interests: The author declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article. (© The Author(s) 2022.) |
| Databáze: | MEDLINE |
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