Determination of Attenuation Collection Methods According to the Type of Radioactive Waste Drums

방사성폐기물드럼 종류별 감쇠보정방법의 결정

  • 곽상수 (한국전력공사 원자력환경기술원) ;
  • 최병일 (한국전력공사 원자력환경기술원) ;
  • 윤석중 (한국전력공사 원자력환경기술원) ;
  • 이익환 (한국전력공사 원자력환경기술원) ;
  • 강덕원 (전력연구원) ;
  • 성기방 (전력연구원)
  • Published : 1997.12.30


The measured radioactivity of gamma-emitting radionuclides in each radioactive waste drum using the non-destructive waste assay method is underestimated than real radioactivity in radioactive waste drum because the gamma-rays are attenuated within the medium. Therefore, the measured radioactivity should be corrected for the attenuation of gamma-rays. For the correction of the attenuation of gamma-rays, the attenuation correction method should be applied differently by considering the distribution and density of medium in radioactive wastes drum generated from nuclear power plants. In this study, the model drums were fabricated for simulating five types of radioactive waste drums generated from nuclear power plant and the optimum methods of the attenuation correction were experimentally determined to analyze the activity of radionuclides in the waste drum accurately using the segmented gamma scanning system. With the determination of the attenuation correction methods from the experimental results the transmission method and the average density method for the miscellaneous waste drum, the transmission method and the differential peak absorption method for the shielded miscellaneous waste drum were used to measure the density of medium in waste drums. Also, the average density method and the differential peak absorption method for the spent resin drum, the paraffin solidified drum, and the spent filter drum were used.