首页|Evaluation of environmental radioactivity in soils around a coal burning power plant and a coal mining area in Barapukuria, Bangladesh: Radiological risks assessment
Evaluation of environmental radioactivity in soils around a coal burning power plant and a coal mining area in Barapukuria, Bangladesh: Radiological risks assessment
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NSTL
Elsevier
To study the distributions and potential dispersions of naturally occurring radioactive materials (NORMs: Ra-226, Th-232, and K-40) from coal-based activities (Barapukuria, Bangladesh), we studied a suite of systematically collected surface and sub-surface soil samples by X-ray fluorescence and high purity germanium detector based gamma-spectroscopy. The average (range) radioactivities of Ra-226, Th-232, and K-40 in the studied soil samples were 80.6 (33.0-118.0), 104.4 (43.0-182.0), and 508.1 (318.3-743.4) Bq.kg(-1), respectively, which are significantly higher than the corresponding world average value. No significant fractionations of NORMs were observed between the surface and sub-surface soils, except for Th-232. Along with the anthropogenic origin, several geochemical processes (e.g., weathering, mineralogical dissolution/precipitation, alteration, leaching, differential solubility mediated geochemical mobility etc.) play significant role in NORM distributions. Major-oxide abundances, indices-based calculations, and correlation studies on the measured parameters revealed the natural processes (e. g., geochemical mobility, mineralogical distributions, water logging based differential solubility) responsible for NORM distributions. In terms of mean radium equivalent activity, internal hazard index, and total annual effective dose values, the studied area possesses trivial radiological risks, whereas the values of internal absorbed gamma dose and excess lifetime cancer risk demonstrate significant health hazards. Considering the adverse radiological risks originating from coal-based industrial activities and the long half-lives of NORMs, the present scenario will potentially be deteriorated.
BarapukuriBangladeshCoal-based industrial activitiesSoils around coal-industriesMajor oxidesDistribution of NORMsRadiological risksRARE-EARTH-ELEMENTSNATURALLY-OCCURRING RADIONUCLIDESNATURAL RADIONUCLIDESSPATIAL-DISTRIBUTIONRIVER SEDIMENTSHEAVY-METALSINDUSTRIAL-WASTESCOXS-BAZARURANIUMK-40
NSTL
Elsevier
