Assessment of Radiation Level Within and Around Stonebridge Quarry Site, Km 22 Lagos Ibadan Express Way, Southwest Nigeria

摘要

Within and around major cities of Southwestern Nigeria, there are scores of quarry industries whose activities constitute menace into the immediate environments. This study assessed the level of natural radiations resident in different rock aggregate sizes, surface and subsurface soils within and around a typical quarry sites (Stone bridge quarry) located close to Ibadan, Southwestern Nigeria. Radiations were determined to a maximum depth of 2.0 m and up to 500 m away from the quarry phases. The radiation level was found to be higher in the freshly quarried coarse aggregate (138 count per minute (cpm)) than previously quarried coarse rock aggregate (132 cpm) and also higher in muscovitic coarse aggregate (120 cpm) than in biotitic coarse aggregate (108 cpm). However, the radiation levels in dust (