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IJSTR >> Volume 6 - Issue 12, December 2017 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Radiometric And Petrographic Studies Of A Typical Basement Complex Terrain, Southwestern Nigeria

[Full Text]



Olayanju, G. M, Adigun, O. E



basement complex, biophile, health hazard, ionizing, oxyphile, petrography, radiation, radioactive minerals, radiometry.



Radiometric and petrographic study was carried out over a typical basement terrain of southwestern Nigeria in order to evaluate possible impact of high radiation in the environment, which can pose any health hazard. In this study, the radiometric mapping was done using a portable hand-held Geiger-Muller counter with the aim of establishing the background radiation level within the campus and possible association with lithology pattern in the area. The petrographic analysis of the rock samples obtained from outcrops of rock masses in the study area revealed that the major minerals are Quartz, Biotite, Plagioclase, Orthoclase, Myrmeckite, Microcline and Opaque minerals. The radiation emitting mineral in these rock samples are Biotite, Orthoclase and Microcline. A strong linear relation was established between the percentage mineral composition in the rocks and the background radiation measured over the study area at 95% confidence level. The local high values in background radiation can be attributed to high percentage of potassium and aluminium minerals in the rock composition as observed over charnockites and migmatite-gneiss. The background radiation level in most of the study area falls within the range of 0.16μSv/hr (1.4mSv/yr) and 0.27μSv/hr (2.36mSv/yr), considered to be within the normal world average background radiation level. In addition to oxyphile and biophile tendency of radioactive elements in the mineral assemblages of the rocks, resulting in their concentration in the organic compounds, humus and other agricultural soils, notable high radiation levels can be attributed to human activities, especially where radiation level is above the 0.27μSv/hr (2.36mSv/yr). High background radiation levels within the range of 0.28μSv/hr (2.45mSv/yr) and 0.38μSv/hr (3.33mSv/yr) recorded in some parts of the study area are at car parks, around laboratories and isolated areas close to the farm in the area.



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