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논문 기본 정보

자료유형
학술저널
저자정보
Seo, Jihye (School of Achitectural, Civil, Environmental and Energy Engineering, Kyungpook National University) Nirwono, Muttaqin Margo (School of Achitectural, Civil, Environmental and Energy Engineering, Kyungpook National University) Park, Seong Jin (School of Achitectural, Civil, Environmental and Energy Engineering, Kyungpook National University) Lee, Sang Hoon (School of Achitectural, Civil, Environmental and Energy Engineering, Kyungpook National University)
저널정보
대한방사선방어학회 방사선방어학회지 방사선방어학회지 제43권 제1호
발행연도
2018.1
수록면
29 - 38 (10page)

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Background: Radon contributing about 42% of annual average dose, mainly comes from soil. In this paper, standard measurement procedures for soil radon exhalation rate are suggested and their measurement uncertainties are analyzed. Materials and Methods: We used accumulation method for estimating surface exhalation rate. The closed-loop measurement system was made up with a RAD7 detector and a surface chamber. Radon activity concentrations in the system were observed as a function of time, with data collection of 5 and 15-minute and the measurement time of 4 hours. Linear and exponential fittings were used to obtain radon exhalation rates from observed data. Standard deviations of measurement uncertainties for two approaches were estimated using usual propagation rules. Results and Discussion: The exhalation rates (E) from linear approach, with 30 minutes measurement time were $44.8-48.6mBq{\cdot}m^{-2} {\cdot}s^{-1}$ or $2.14-2.32atom{\cdot}cm^{-2}{\cdot}s^{-1}$ with relative measurement uncertainty of about 10%. The contributions of fitting parameter A, volume (V) and surface (S) to the estimated measurement uncertainty of E were 59.8%, 30.1% and 10.1%, in average respectively. In exponential fitting, at 3-hour measurement we had E ranged of $51.6-69.2mBq{\cdot}m^{-2} {\cdot}s^{-1}$ or $2.46-3.30atom{\cdot}cm^{-2}{\cdot}s^{-1}$ with about 15% relative uncertainty. Fitting with 4-hour measurement resulted E about $51.3-68.2mBq{\cdot}m^{-2} {\cdot}s^{-1}$ or $2.45-3.25atom{\cdot}cm^{-2}{\cdot}s^{-1}$ with 10% relative uncertainty. The uncertainty contributions in exponential approach were 75.1%, 13.4%, 8.7%, and 2.9% for total decay constant k, fitting parameter B, V, and S, respectively. Conclusion: In obtaining exhalation rates, the linear approach is easy to apply, but by saturation feature of radon concentrations, the slope tends to decrease away from the expected slope for extended measurement time. For linear approach, measurement time of 1-hour or less was suggested. For exponential approach, the obtained exhalation rates showed similar values for any measurement time, but measurement time of 3-hour or more was suggested for about 10% relative uncertainty.
#Soil radon #Exhalation rate #Uncertainty #RAD7

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참고문헌 (14)

참고문헌 신청
Baskaran M / 2016 / Radon: a tracer for geological, geophysical and geochemical studies / Springer Publishing :229 google schola Haque AK / 1988 / Main factors affecting the calculation of radiation dose to the lung from inhalation of radon daughters / Sci. Total Environ. 74:279~289 Crossref Boyle P / 2008 / World Cancer report 2008. 1st Ed :512 google schola Tan Y / 2013 / Measurement of the radon exhalation rate from the medium surface by tracing the radon concentration / J. Radioanal. Nucl. Chem. 295(3):2295~2299 Crossref International Commission on Radiation Units / 2012 / Measurement and Reporting of Radon Exposures. ICRU Report 88 / J. ICRU 12(2):1~24 google schola

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