Distribution of naturally occurring radionuclides in soil around a coal-based power plant and their potential radiological risk assessment
-
Md. Ahosan Habib
,
Md. Bazlar Rashid
Abstract
Coal-fly-ash is one of the major byproducts of coal-based power plant in which naturally occurring radioactive materials (NORMs) are drastically enriched compared to those of feed coals. Thus, improper management of fly-ash may introduce additional radioactivity to the surrounding environment and cause radiological risk. So, in order to study the distribution of radionuclides in soil around a coal-based power plant and to evaluate their radiological risk, soil, coal and fly-ash samples were analyzed by using a HPGe detector for U-238, Ra-226, Th-232 and K-40 radioactivity concentrations. Furthermore, soil minerals were also studied by X-ray diffractometer to assess the mineralogical provenance of the radionuclides. Mean radioactivity concentrations (in Bq·kg−1) of U-238, Ra-226, Th-232 and K-40 in soil samples are 102.9±41.4, 63.6±7.4, 103.4±13.9 and 494.2±107.5, respectively which are comparatively higher than the typical world mean value. Elevated levels of radioactivity are likely due to the presence of illite, kaolinite, monazite, rutile and zircon minerals in the soil samples rather than technogenic contributions from the power plant. Furthermore, mean soil contamination factor (CF) are close to unity and mean pollution load index (PLI) is below unity while the average radium equivalent activity (Raeq in Bq·kg−1), external hazard index (Hex), absorbed γ dose rate (D in nGyh−1), annual effective dose rate (E in mSv·y−1) and excess lifetime cancer risk (ELCR in Sv−1) are 249.5±21.7, 0.67±0.06, 114.2±9.4, 0.20±0.02, 4.9×10−4±0.4×10−4, respectively, which are within the permissible limit. Thus, in terms of radioactivity concentrations and associated environmental and radiological indices, the effect of the power plant is insignificant.
Acknowledgements
The authors would like to acknowledge the Thailand’s Education Hub for Southern Region of ASEAN Countries (TEH-AC) (Contract No.: THE-AC014/2016), funds for Doctor of Philosophy programme in Sustainable Energy Management, Faculty of Environmental Management, Graduate School, Prince of Songkla University, Thailand, and the authority of Geological Survey of Bangladesh (GSB), Bangladesh for all other forms of support for this study.
Conflict of interest: There is no conflict of interest.
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Articles in the same Issue
- Frontmatter
- Uranium oxide synthetic pathway discernment through thermal decomposition and morphological analysis
- Applications of the uranium’s set of isotopes for nuclear dating: the Monte-Carlo method
- Quantification of trace level rare earth elements in Al matrices by ICP-MS
- Synergistic effect of vermiculite clay and ionizing irradiation on the physical and mechanical properties of polybutadiene rubber/ethylene propylene diene monomer nanocomposite
- Development of a novel 68Ga-dextran carboxylate derivative for blood pool imaging
- Distribution of naturally occurring radionuclides in soil around a coal-based power plant and their potential radiological risk assessment
- Investigation of γ ray shielding, structural and dissolution rate studies of alkali based bismuth borate glass systems with MoO3 added
- Novel radiochromic porphyrin-based film dosimeters for γ ray dosimetry: investigation on metal and ligand effects
