Gamma Dose Rate And Effective Dose Equivalent Due To Gamma Radiation From Granite Samples Collected From Prominent Quarry Sites In Oyo State, Nigeria
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2015, Vol 3, Issue 8
Abstract
The global attention to the problem of exposure due to natural gamma radiation and associated health risk in dwelling using some materials for building and construction called for this study. Due to the widespread and the high percentage use of granite as building and decoration materials, radiometric analysis was done on granite samples collected from prominent quarry across Oyo state of Nigeria using Nal (TI) Gamma-ray spectrometer techniques. The activity concentration of primordial radionuclides 226Ra, 232Th and 40K in the samples range from 51.45 to 25.30 Bqkg-1, 38.26 to 17.44 Bqkg-1 and 432.02 to104.20 Bqkg-1 respectively. The radium equivalent activity (Raeq), the external hazard index (Hex) and the internal hazard index (Hin) were also determined and found within accepted values by (UNSCEAR). The radium equivalent activities in all the granite samples were lower than the limit (370Bqkg-1) set in the Organization for Economic Cooperation and Development (OECD) report and the dose equivalent was within the safe limit of 1 mSvy-1.
Authors and Affiliations
G. A Isola, D. A Ajadi
Keywords
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