Browsing by Author "Adagunodo, T. A."
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Item Assessment of radiogenic heat generation in a flood plain of crystalline Basement rocks(IOP Publishing, 2019-08) Adagunodo, T. A.; Sunmonu, L. A.; Adabanija, Moruffdeen A.; Omidiora, J. O.; Emetere, M. E.; Joel, E. S.; Ijeh, Victor; Esse, Ugwunwa C.Concentrations of radioelements in a flood plain of Crystalline Basement Complex are determined, with the aim of assessing the radiogenic heat produced in the study area. Ten soil samples are collected for analysis using Inductively Coupled Plasma Mass Spectrometry technique from ACME Laboratories. The radiogenic heat contributions by each radioelement in the flood plain varied from 95.70 to 393.37 ρw/kg; 71.68 to 642.56 ρw/kg; and 0.0088 to 0.0188 ρw/kg for uranium, thorium and potassium respectively. However, the total radiogenic heat production varied from 167.39 to 1034.9 ρw/kg, with thorium being the major contributor to the total heat generated in the study area. Nine locations in the study area are characterized by Low Heat Potential (LHP), while the remaining one is characterized by Moderate Heat Potential. On average, the study area could be classified as LHP, which is in agreement with some of the studies in crystalline terrain of Nigeria.Item Distribution of radionuclides and assessment of risk exposure to the miners on a kaolin field(IOP Publishing, 2019-08) Adagunodo, T. A.; Hammed, O. S.; Oyebanjo, O. A.; Obafemi, Y. D.; Omeje, Maxwell; Isibor, Patrick O.; Lukman, A. F.; Oladejo, Olagoke P.; Onumejor, C. A.; Esse, Ugwunwa C.Mining of kaolin deposits are common in Nigeria without considering the background radiation in such environment and the health risks it might pose on the miners. In this study, in-situ measurements of the naturally occurring radionuclides were carried out with the aim of determining the distribution of these radionuclides on the mining field and estimation of the hazard indices exposure risks (γ- and α-radiation risks) to the miners. The study was achieved with the aid of gamma ray detector Super-Spec (RS-125) and global positioning system. The detector used has ability to measure activity concentrations of 238U, 232Th and 40K and gamma doses. For the purpose of this study, only the concentrations of the three radionuclides were considered. For each location, measurements were taken four times, while its mean value was estimated for better accuracy. In all, nineteen locations were occupied in order to cover the study area. Basic kriging method was adopted for the production of spatial distribution of these radionuclides and their corresponding γ- and α-radiation hazard indices. The mean values of 238U, 232Th and 40K are 46.7, 71.8 and 108.7 Bq kg-1 , respectively. When compared to the global standard, it was revealed that 238U and 232Th are greater than the global standard, while 40K fall below the permissible limit. The γ- and α-radiation exposure risks estimated revealed that the mean values of Iγ and Iα are 0.6 and 0.2 respectively. Though the estimated γ- and α-radiation indices showed that the kaolin field is safe for the miners, periodic check is required in order to monitor the rate at which these natural primordial radionuclides (238U and 232Th and their progenies) are being enhanced.