In situ natural radioactivity and radiological hazard assessments of granite gneiss outcrops in parts of the Southwestern Basement Complex of Nigeria
Radioactive emission (gamma ray) emanating from rock materials constitutes threats to humans and their environment. Hence, the natural radioactivity and radiological hazard indices of some granite gneiss outcrops with their residual soils from two different localities within the Southwestern Basemen...
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Artvin Coruh University
2019-07-01
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| Series: | Doğal Afetler ve Çevre Dergisi |
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| Online Access: | http://dacd.artvin.edu.tr/tr/download/article-file/692980 |
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| author | Adedibu Sunny Akingboye Omowumi Ademila |
| author_facet | Adedibu Sunny Akingboye Omowumi Ademila |
| author_sort | Adedibu Sunny Akingboye |
| collection | DOAJ |
| description | Radioactive emission (gamma ray) emanating from rock materials constitutes threats to humans and their environment. Hence, the natural radioactivity and radiological hazard indices of some granite gneiss outcrops with their residual soils from two different localities within the Southwestern Basement Complex of Nigeria were assessed using Gamma-ray spectrometry. The study aimed at determining the natural radiation levels of granite gneissic rocks and associated radiological threats to people living in the study area from gamma ray exposure. Data were collected along six geophysical traverses of 200 m each with station spacing of 5 m using the portable hand-held Gamma-ray Spectrometer. The results of weighted mean values of the elemental and activity concentrations for 40K, 238U, and 232Th are 2.00 ± 1.43%, 3.13 ± 0.90 ppm, 12.32 ± 4.99 ppm and 629.28 ± 447.29, 38.58 ± 11.02, 49.96 ± 20.23 respectively. The obtained mean concentration ratios of 1.32 for U/Th and 2.14 for Th/U were higher than 0.26 and lower than 3.5 global standard ratios respectively. The increase in activity concentrations and concentration ratio may have suggested the enrichment of radioactive minerals in the granite gneissic rocks. The annual outdoor and indoor effective doses of gamma ray exposure for people living in the study area were below the world permissible standard of 1 , thus, the area is radiologically safe. However, increase in estimated mean of AGDE and ELCR; 525.620 and 1.273 above the world permissible standards of 300 and respectively does not translate to significant radiological threats. Therefore, control measure by constant monitoring of the radioactivity levels of the area and rocks should be practiced. |
| format | Article |
| id | doaj-art-3daeb525c3f04b8d9bf232caf88dde79 |
| institution | Kabale University |
| issn | 2528-9640 2528-9640 |
| language | English |
| publishDate | 2019-07-01 |
| publisher | Artvin Coruh University |
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| series | Doğal Afetler ve Çevre Dergisi |
| spelling | doaj-art-3daeb525c3f04b8d9bf232caf88dde792025-02-03T03:14:31ZengArtvin Coruh UniversityDoğal Afetler ve Çevre Dergisi2528-96402528-96402019-07-015221422310.21324/dacd.475998In situ natural radioactivity and radiological hazard assessments of granite gneiss outcrops in parts of the Southwestern Basement Complex of NigeriaAdedibu Sunny Akingboye0Omowumi Ademila1Department of Earth Sciences, Adekunle Ajasin University, P.M.B. 001 Akungba-Akoko, Ondo State, Nigeria.Department of Earth Sciences, Adekunle Ajasin University, P.M.B. 001 Akungba-Akoko, Ondo State, Nigeria.Radioactive emission (gamma ray) emanating from rock materials constitutes threats to humans and their environment. Hence, the natural radioactivity and radiological hazard indices of some granite gneiss outcrops with their residual soils from two different localities within the Southwestern Basement Complex of Nigeria were assessed using Gamma-ray spectrometry. The study aimed at determining the natural radiation levels of granite gneissic rocks and associated radiological threats to people living in the study area from gamma ray exposure. Data were collected along six geophysical traverses of 200 m each with station spacing of 5 m using the portable hand-held Gamma-ray Spectrometer. The results of weighted mean values of the elemental and activity concentrations for 40K, 238U, and 232Th are 2.00 ± 1.43%, 3.13 ± 0.90 ppm, 12.32 ± 4.99 ppm and 629.28 ± 447.29, 38.58 ± 11.02, 49.96 ± 20.23 respectively. The obtained mean concentration ratios of 1.32 for U/Th and 2.14 for Th/U were higher than 0.26 and lower than 3.5 global standard ratios respectively. The increase in activity concentrations and concentration ratio may have suggested the enrichment of radioactive minerals in the granite gneissic rocks. The annual outdoor and indoor effective doses of gamma ray exposure for people living in the study area were below the world permissible standard of 1 , thus, the area is radiologically safe. However, increase in estimated mean of AGDE and ELCR; 525.620 and 1.273 above the world permissible standards of 300 and respectively does not translate to significant radiological threats. Therefore, control measure by constant monitoring of the radioactivity levels of the area and rocks should be practiced.http://dacd.artvin.edu.tr/tr/download/article-file/692980ground radiometric surveygamma-ray spectrometrynatural radioactivitygranite gneissakunu-akokoayere |
| spellingShingle | Adedibu Sunny Akingboye Omowumi Ademila In situ natural radioactivity and radiological hazard assessments of granite gneiss outcrops in parts of the Southwestern Basement Complex of Nigeria Doğal Afetler ve Çevre Dergisi ground radiometric survey gamma-ray spectrometry natural radioactivity granite gneiss akunu-akoko ayere |
| title | In situ natural radioactivity and radiological hazard assessments of granite gneiss outcrops in parts of the Southwestern Basement Complex of Nigeria |
| title_full | In situ natural radioactivity and radiological hazard assessments of granite gneiss outcrops in parts of the Southwestern Basement Complex of Nigeria |
| title_fullStr | In situ natural radioactivity and radiological hazard assessments of granite gneiss outcrops in parts of the Southwestern Basement Complex of Nigeria |
| title_full_unstemmed | In situ natural radioactivity and radiological hazard assessments of granite gneiss outcrops in parts of the Southwestern Basement Complex of Nigeria |
| title_short | In situ natural radioactivity and radiological hazard assessments of granite gneiss outcrops in parts of the Southwestern Basement Complex of Nigeria |
| title_sort | in situ natural radioactivity and radiological hazard assessments of granite gneiss outcrops in parts of the southwestern basement complex of nigeria |
| topic | ground radiometric survey gamma-ray spectrometry natural radioactivity granite gneiss akunu-akoko ayere |
| url | http://dacd.artvin.edu.tr/tr/download/article-file/692980 |
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