Nuclear Engineering and Technology

  • 제54권4호
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  • Pages.1431-1438
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  • 2022
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Natural radioactivity level in fly ash samples and radiological hazard at the landfill area of the coal-fired power plant complex, Vietnam

  • Loan, Truong Thi Hong (Nuclear Technique Laboratory, University of Science) ;
  • Ba, Vu Ngoc (Nuclear Technique Laboratory, University of Science) ;
  • Thien, Bui Ngoc (Department of Nuclear Physics - Nuclear Engineering, Faculty of Physics and Engineering Physics, University of Science)
  • 투고 : 2021.04.08
  • 심사 : 2021.10.13
  • 발행 : 2022.04.25
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초록

In this study, natural radioactivity concentrations and dosimetric values of fly ash samples were evaluated for the landfill area of the coal-fired power plant (CFPP) complex at Binh Thuan, Vietnam. The average activity concentrations of 238U, 226Ra, 232Th and 40K were 93, 77, 92 and 938 Bq kg-1, respectively. The average results for radon dose, indoor external, internal, and total effective dose equivalent (TEDE) were 5.27, 1.22, 0.16, and 6.65 mSv y-1, respectively. The average emanation fraction for fly ash were 0.028. The excess lifetime cancer risks (ELCR) were recorded as 20.30×10-3, 4.26×10-3, 0.62×10-3, and 25.61×10-3 for radon, indoor, outdoor exposures, and total ELCR, respectively. The results indicated that the cover of shielding materials above the landfill area significantly decreased the gamma radiation from the ash and slag in the ascending order: Zeolite < PVC < Soil < Concrete. Total dose of all radionuclides in the landfill site reached its peak at 19.8 years. The obtained data are useful for evaluation of radiation safety when fly ash is used for building material as well as the radiation risk and the overload of the landfill area from operation of these plants for population and workers.

키워드

과제정보

This research is funded by Vietnam National University Ho Chi Minh City (VNU-HCM) under grant number VL2020-18-01. We would like to express our sincere thanks to Prof. Dr. Sc. Nguyen Ngoc Tran, Dr. Le Xuan Thuyen and the Board of Directors of the EVN Group, the Board of Directors of Vinh Tan 2 CFPP for supporting the measurements and sampling in the inner area and the disposal area of the CFPP.

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