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Geological influence on the activity concentration of terrestrial radionuclides 226 Ra, 232 Th and 40 K in the Jos Plateau, Nigeria.
Isotopes in Environmental and Health Studies 2018 October
The Jos Plateau has been reported to have elevated levels of natural background radiation. A few earlier studies have measured the levels of natural radioactivity for specific locations in the area. Our interest is to investigate how geology of the study area influences the activity concentrations of natural radionuclides. Thus, the activity concentrations of terrestrial radionuclides in soil samples collected across the geological formations of the Jos Plateau were determined by gamma spectrometry technique. The mean activity concentrations of 226 Ra, 232 Th and 40 K were found to exceed their corresponding world reference values of 35, 40 and 400 Bq kg-1 , respectively. Data were compared using statistical methods, analysis of variance (ANOVA) and post hoc tests. The results revealed in some instances significant influences of geological types on the activity concentrations in the area. The spatial distribution maps of activity concentrations of 226 Ra, 232 Th and 40 K were geostatistically interpolated by ordinary Kriging method using ArcGIS software.
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