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Evaluation of 226Ra analysis methods using a gamma-ray spectrometer and a liquid scintillation counter

감마선분광분석기와 액체섬광계수기를 이용한 226Ra 분석법 비교 연구

  • Ju, Byoung Kyu (Soil and Groundwater Division, National Institute of Environmental Research) ;
  • Kim, Moon Su (Soil and Groundwater Division, National Institute of Environmental Research) ;
  • Kim, Hyun Koo (Soil and Groundwater Division, National Institute of Environmental Research) ;
  • Kim, Dong Su (Soil and Groundwater Division, National Institute of Environmental Research) ;
  • Cho, Sung Jin (Soil and Groundwater Division, National Institute of Environmental Research) ;
  • Yang, Jae Ha (Soil and Groundwater Division, National Institute of Environmental Research) ;
  • Park, Sun Hwa (Soil and Groundwater Division, National Institute of Environmental Research) ;
  • Kim, Hyoung Seop (Soil and Groundwater Division, National Institute of Environmental Research) ;
  • Kwon, Oh Sang (Soil and Groundwater Division, National Institute of Environmental Research) ;
  • Kim, Tae Seung (Soil and Groundwater Division, National Institute of Environmental Research)
  • 주병규 (국립환경과학원 토양지하수연구과) ;
  • 김문수 (국립환경과학원 토양지하수연구과) ;
  • 김현구 (국립환경과학원 토양지하수연구과) ;
  • 김동수 (국립환경과학원 토양지하수연구과) ;
  • 조성진 (국립환경과학원 토양지하수연구과) ;
  • 양재하 (국립환경과학원 토양지하수연구과) ;
  • 박선화 (국립환경과학원 토양지하수연구과) ;
  • 김형섭 (국립환경과학원 토양지하수연구과) ;
  • 권오상 (국립환경과학원 토양지하수연구과) ;
  • 김태승 (국립환경과학원 토양지하수연구과)
  • Received : 2015.03.24
  • Accepted : 2015.04.29
  • Published : 2015.06.25

Abstract

The efficiency and applicability of the solid phase extraction disk method in a 226Ra analysis were examined by the gamma ray spectrometer (GRS) method using a Marinelli beaker and the liquid scintillation counter (LSC) method for groundwater. The recovered 226Ra, which was filtered by the solid phase extraction disk, was analyzed using gamma ray spectrometer The disks, which were pretreated for caulking the daughter nuclide, were sealed with polyethylene film. Distilled water was used for the blank value of the 226Ra activity. The recovery values of 214Bi and 214Pb in the solid phase extraction disk, which used 226Ra standard material, were 80% (295.21 Kev) and 104% (351.92 Kev), respectively, which were higher than 75% determined by the LSC. The injection of nitrogen gas into the measuring chamber reduced the interference values by about 10%. The detection limits of the 226Ra activity in a blank sample of 5 L were 0.17~0.40 pCi/L after 80,000 seconds of measuring time. The relationship of the 226Ra activity in the solid phase extraction disk method and in the LSC method in seven groundwater samples showed a correlation coefficient value 0.987, which implies the applicability of the solid phase extraction disk method. The results showed that 226Ra activity in groundwater using the solid phase extraction disk method has the following benefits: simple pretreatment, time saving, high recovery values, a low detection limit, and so on. Compared with the LSC method and the GRS method using the Marinelli beaker for the 226Ra analysis, the solid phase extraction disk method could be useful in groundwater samples with low levels of activities of radionuclides because the method is not restricted by the volume of the sample.

Keywords

226Ra;solid phase extraction disk;marinelli beaker;spectrometer;liquid scintillation counter

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