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      • KCI등재

        Effects of element composition in soil samples on the effi ciencies of gamma energy peaks evaluated by the MCNP5 code

        Vu Ngoc Ba,Bui Ngoc Thien,Truong Thi Hong Loan 한국원자력학회 2021 Nuclear Engineering and Technology Vol.53 No.1

        In this work, self-absorption correction factor related to the variation of the composition and the densityof soil samples were evaluated using the p-type HPGe detector. The validated MCNP5 simulation modelof this detector was used to evaluate its Full Energy Peak Efficiency (FEPE) under the variation of thecomposition and the density of the analysed samples. The results indicates that FEPE calculation of lowgamma ray is affected by the composition and the density of soil samples. The self-absorption correctionfactors for different gamma-ray energies which was fitted as a function of FEPEs via density and energyand fitting parameters as polynomial function for the logarithm neper of gamma ray energy help tocalculate quickly the detection efficiency of detector. Factor Analysis for the influence of the elementcomposition in analysed samples on the FEPE indicates the FEPE distribution changes from non-metal tometal groups when the gamma ray energy increases from 92 keV to 238 keV. At energies above 238 keV,the FEPE primarily depends only on the metal elements and is significantly affected by aluminium andsilicon composition in soil samples.

      • SCIESCOPUSKCI등재

        Effects of element composition in soil samples on the efficiencies of gamma energy peaks evaluated by the MCNP5 code

        Ba, Vu Ngoc,Thien, Bui Ngoc,Loan, Truong Thi Hong Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.1

        In this work, self-absorption correction factor related to the variation of the composition and the density of soil samples were evaluated using the p-type HPGe detector. The validated MCNP5 simulation model of this detector was used to evaluate its Full Energy Peak Efficiency (FEPE) under the variation of the composition and the density of the analysed samples. The results indicates that FEPE calculation of low gamma ray is affected by the composition and the density of soil samples. The self-absorption correction factors for different gamma-ray energies which was fitted as a function of FEPEs via density and energy and fitting parameters as polynomial function for the logarithm neper of gamma ray energy help to calculate quickly the detection efficiency of detector. Factor Analysis for the influence of the element composition in analysed samples on the FEPE indicates the FEPE distribution changes from non-metal to metal groups when the gamma ray energy increases from 92 keV to 238 keV. At energies above 238 keV, the FEPE primarily depends only on the metal elements and is significantly affected by aluminium and silicon composition in soil samples.

      • KCI등재

        Natural radioactivity level in fly ash samples and radiological hazard at the landfill area of the coal-fired power plant complex, Vietnam

        Truong Thi Hong Loan,Vu Ngoc Ba,Bui Ngoc Thien 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.4

        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.

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