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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

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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. Theaverage 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 were0.028. The excess lifetime cancer risks (ELCR) were recorded as 20.30 10 3, 4.26 10 3, 0.62 10 3, and25.61 10 3 for radon, indoor, outdoor exposures, and total ELCR, respectively. The results indicated thatthe cover of shielding materials above the landfill area significantly decreased the gamma radiation fromthe ash and slag in the ascending order: Zeolite < PVC < Soil < Concrete. Total dose of all radionuclides inthe landfill site reached its peak at 19.8 years. The obtained data are useful for evaluation of radiationsafety when fly ash is used for building material as well as the radiation risk and the overload of thelandfill area from operation of these plants for population and workers.

Abstract

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. Theaverage 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 were0.028. The excess lifetime cancer risks (ELCR) were recorded as 20.30 10 3, 4.26 10 3, 0.62 10 3, and25.61 10 3 for radon, indoor, outdoor exposures, and total ELCR, respectively. The results indicated thatthe cover of shielding materials above the landfill area significantly decreased the gamma radiation fromthe ash and slag in the ascending order: Zeolite < PVC < Soil < Concrete. Total dose of all radionuclides inthe landfill site reached its peak at 19.8 years. The obtained data are useful for evaluation of radiationsafety when fly ash is used for building material as well as the radiation risk and the overload of thelandfill area from operation of these plants for population and workers.

참고문헌 (40)

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