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Assessment of natural radioactivity levels in the Ajali Formation, Enugu, South Eastern Nigeria

Maxwell, Omeje and Wagiran, Husin and Joel, E. S. and Adewoyin, O.O and Usikalu, M.R. and Tenebe, I.T. and Oha, I. A. and Ofuyatan, Olatokunbo M. and Okolie, S. T. (2018) Assessment of natural radioactivity levels in the Ajali Formation, Enugu, South Eastern Nigeria. In: International Conference on Water Resource and Environment.

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Activity concentrations of the radionuclides (238U, 232Th and40K) were analysed using high resolution co-axial HPGe gamma ray spectrometer system to know the implication where groundwater is sourced from Enugu, South-East Nigeria. The activity concentration of 238U ranges from 37 ± 4 to 74 ± 6 Bq kg-1 with the highest value of 74 ± 6 Bq kg-1 noted in the thin coal sample. The 232Th activity level in the rock samples ranges from 58 ± 5 to 85 ± 7 Bq kg-1 with the higher value of 89 ± 7 Bq kg-1 reported in the coal sample. For 40K, the activity concentration varies from 140 ± 19 to 293 ± 25 Bq kg-1 with the highest value of 293 ± 25 Bq kg-1 reported in coal samples whereas lowest value of 140 ± 19 Bq kg-1 was noted in Ajali sandstone in the study area (Enugu State). The higher activity levels of 238U, 232Th and 40K reported in coal samples may be due to the closer clusters of weathered surface of Ajali sandstone that overlays the thin coal layer with an escarpment being spread out, implying higher permeability towards deeper direction. All the values are within the recommended level when compared with United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR, 2000). Further research on groundwater activity concentration and rock geochemistry is required within the study area. This will allow for a comprehensive conclusion to be drawn on the level of exposures to the inhabitants relying on groundwater for consumption

Item Type: Conference or Workshop Item (Paper)
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering, Science and Mathematics > School of Physics
Depositing User: Mrs Hannah Akinwumi
Date Deposited: 11 Jul 2019 09:08
Last Modified: 11 Jul 2019 09:08

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