Corrections of Self-Absorption Effect Using the Monte Carlo Method in the Radioactivity Analysis of Environmental Samples

환경시료의 방사능 분석에서 Monte Carlo 방법을 이용한 자체흡수 효과 보정

  • Seo, Bum-Kyoung (Department of Physics, Pusan National University) ;
  • Lee, Dae-Won (Department of Physics, Pusan National University) ;
  • Lee, Kil-Yong (Environmental Geology Division, Korea Institute of Geoscience and Mineral Resources(KIGAM)) ;
  • Yoon, Yoon-Yeol (Environmental Geology Division, Korea Institute of Geoscience and Mineral Resources(KIGAM)) ;
  • Yang, Tae-Keun (Environmental Geology Division, Korea Institute of Geoscience and Mineral Resources(KIGAM))
  • 서범경 (부산대학교 물리학과) ;
  • 이대원 (부산대학교 물리학과) ;
  • 이길용 (한국지질자원연구원 환경지질연구부) ;
  • 윤윤일 (한국지질자원연구원 환경지질연구부) ;
  • 양태건 (한국지질자원연구원 환경지질연구부)
  • Published : 2001.06.30

Abstract

In the low level radioactivity measurement, such as environmental radioactivity, there were used commonly cylindrical and Marinelli type beakers by means of measurement container. If there are differences in the matrix density or sample height between standard source and sample, it must be determined full energy peak efficiency considering self absorption effect. In this paper, we compared measured efficiency with calculated full energy peak efficiencies in the HPGe detector using the Monte Carlo method. For cylindrical container, we calculated the variation of the efficiency with sample height. Also, we calculated the variation of the detection efficiency with apparent density in the cylindrical and Marinelli container. It was seen that it need to be corrected for self absorption in the energy range of below 1000keV. Also, in order to verify the validity of calculation, we compared the calculated value with reference value using NIST SRM 4353 reference soil.