대한환경공학회지 (Journal of Korean Society of Environmental Engineers)

  • 제30권11호
  • /
  • Pages.1123-1131
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  • 2008
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  • 1225-5025(pISSN)
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  • 2383-7810(eISSN)
대한환경공학회 (Korean Society of Environmental Engineers)
권호 표지

기기 중성자방사화분석을 이용한 대기 중 PM2.5 내 Arsenic 농도 분석의 측정 불확도

Measurement Uncertainty of Arsenic Concentration in Ambient PM2.5 Determined by Instrumental Neutron Activation Analysis

  • 임종명 (한국원자력연구원 중성자과학연구부) ;
  • 이진홍 (충남대학교 환경공학과) ;
  • 문종화 (한국원자력연구원 중성자과학연구부) ;
  • 정용삼 (한국원자력연구원 중성자과학연구부)
  • Lim, Jong-Myoung (Neutron Science Division, Korea Atomic Energy Research Institute) ;
  • Lee, Jin-Hong (Department of Environmental Engineering, Chungnam National University) ;
  • Moon, Jong-Wha (Neutron Science Division, Korea Atomic Energy Research Institute) ;
  • Chung, Yong-Sam (Neutron Science Division, Korea Atomic Energy Research Institute)
  • 발행 : 2008.11.30
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초록

본 연구는 대기 중 PM2.5의 미량금속 중 As을 중성자방사화분석법을 이용하여 분석할 때 발생되는 측정불확도를 ISO GUM 방법과 MCS 방법을 모두 적용하여 비교, 평가하였다. 불확도의 요인은 ISO GUM을 엄격하게 준용하여 파악하였으며 특정일에 채취된 PM2.5 내 As 농도에 대해 두 방법의 계산 결과가 4% 미만으로 크게 다르지 않는 것으로 나타났다. 연구기간 중 채취된 총 60개의 PM2.5 시료에 대해 As 농도의 확장불확도를 역시 MCS 방법을 이용하여 산출하였는데, 연구지역에서의 As의 개별 농도값에 대한 95% 신뢰구간의 확장불확도는 대부분 10%의 범위에서 존재하는 것으로 나타났다. 확장불확도에 대한 표준불확도 요인의 기여율은 계측통계오차(62.3%), 검출효율(18.5%), 시료 채취 시 유량(12.3%), flux 변동(2.3%), 특정감마선 방출률(1.8%) 등의 순으로 크게 나타났다.

In this study, measurement uncertainty of instrumental neutron activation analysis was evaluated for ambient As concentration in PM2.5. Expanded uncertainties of the measurements were calculated by applying both ISO-GUM approximation and Monte Carlo Simulation(MCS). The estimate of As concentration on a specific day by the Monte Carlo Simulation differed from that of ISO-GUM approximation by less than 4%. Relative expanded uncertainties of As concentrations from a total number of 60 PM2.5 samples were also estimated to be more or less than 10% with 95% confidence level using the Monte Carlo Simulation. Sensitivity test of the measurement uncertainties showed that $\gamma$-ray counting error(62.3%), efficiency(18.5%), air volume(12.3%), neutron flux(2.3%), and absolute gamma-intensity(1.8%) are major factors of uncertainty variations.

키워드

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