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Background Radiation Measurement and the Assessment of Radiological Impacts due to Natural Radioactivity Around Itakpe Iron-Ore Mines

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Abstract

Mining activity and metal extraction processes have been identified as one of the major pathways through which natural radionuclides are accumulated in the terrestrial environment. Exposure to excessive radiation from natural radionuclides can cause deleterious health hazards to man. In this study therefore, the activity concentrations of primordial radionuclides (40K, 238U and 232Th) were measured in rock, soil, tailings and water samples collected from abandoned iron ore mines in order to estimate the radiological impacts associated with the previous mining and metal extraction activities within the environment of abandoned Itakpe iron-ore mines. Gamma spectrometry utilizing a well calibrated NaI(Tl) detector was employed for the measurements. Results show that the average activity concentrations of 40K, 238U and 232Th are 1084 ± 581, 11.0 ± 7.7 and 5.0 ± 1.8 Bq kg−1 respectively for rock samples and 415.6 ± 197.5, 12.8 ± 5.7 and 8.8 ± 5.8 Bq kg−1, respectively for soil samples. The activity concentrations of the three radionuclides are much lower in water samples compared to rocks and soil. Radiological hazard indices calculated from the activity concentrations show that the mining activities have little or no negative impacts on the environment as the radiological risk indices obtained are all lower than their permissible limits.

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Authors and Affiliations

  1. Department of Physics, Ekiti State University, P.M.B. 5363, Ado Ekiti, Nigeria

    Omoniyi Matthew Isinkaye, Segun Adeleke & Daniel Ajide Isah

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  1. Omoniyi Matthew Isinkaye
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  2. Segun Adeleke
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  3. Daniel Ajide Isah
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Correspondence to Omoniyi Matthew Isinkaye.

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Isinkaye, O.M., Adeleke, S. & Isah, D.A. Background Radiation Measurement and the Assessment of Radiological Impacts due to Natural Radioactivity Around Itakpe Iron-Ore Mines. MAPAN 33, 271–280 (2018). https://doi.org/10.1007/s12647-018-0261-9

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