Journal of radiological science and technology (대한방사선기술학회지:방사선기술과학)

Korean Society of Radiological Science (대한방사선과학회)
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A Study on the Self-absorption Correction Method of HPGe Gamma Spectrocopy Analysis System Using Check Source

Check Source를 이용한 HPGe감마핵종분석시스템의 자체흡수 보정방법 연구

  • Jeong-Soo, Park (Dept. of Health Science, Gachon University General Graduate School) ;
  • Hyo-Jin, Lim (Dept. of Radiological Science, Gachon University) ;
  • Hyun-Soo, Seo (Dept. of Radiological Science, Gachon University) ;
  • Da-bin, Jang (Dept. of Radiological Science, Gachon University) ;
  • Myoung-Joon, Kim (Dept. of Radiological Science, Gachon University) ;
  • Sang-Bok, Lee (Dept. of Health Science, Gachon University General Graduate School) ;
  • Sung-Min, Ahn (Dept. of Health Science, Gachon University General Graduate School)
  • 박정수 (가천대학교 일반대학원 보건과학과) ;
  • 임효진 (가천대학교 방사선학과) ;
  • 서현수 (가천대학교 방사선학과) ;
  • 장다빈 (가천대학교 방사선학과) ;
  • 김명준 (가천대학교 방사선학과) ;
  • 이상복 (가천대학교 일반대학원 보건과학과) ;
  • 안성민 (가천대학교 일반대학원 보건과학과)
  • Received : 2022.08.08
  • Accepted : 2022.12.08
  • Published : 2022.12.31
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Abstract

Gamma spectroscopy analysis is widely used for radioactivity analysis, and various factors are required for radioactivity calculations. Among the factors, K3 for each sample significantly influences the results. The previous methods of correcting the self-absorption effect include a computational simulation method and a method that requires making a CRM(certified reference material) identical to the sample medium. However, the above methods have limitations when used in small institutions because they require specialized program utilization skills or high manufacturing costs and large facilities. The aim of this study is to develop a method that can be easily and rapidly applied to radioactivity analysis. After filling the beaker with water, we placed the radiation source in a uniform position and used the measured value as the benchmark. Next, a correction factor was derived based on the difference in the radiation source count of the benchmark and the identically measured sample. For the radiation source, Eu-152, which emits a broad range of energy within the measurement range of gamma rays, and Cs-134 and Cs-137, which are indicator nuclides in environmental radiation analysis, were used. The sample was selected within the density range of 0.26-2.11 g/cm3, and the correction factor was derived by calculating the count difference of each sample compared to the reference value of water. This study presents a faster and more convenient method than the existing research methods for determining the self-absorption effect correction, which has become increasingly necessary.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea(NRF) funded by the Ministry of Science and ICT(NRF-2020M2D6A2093776)

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