Journal of Radiation Industry (방사선산업학회지)

Korean Society of Radiation Industry (한국방사선산업학회)
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Development of Radiation Dose Assessment Algorithm for Arbitrary Geometry Radiation Source Based on Point-kernel Method

Point-kernel 방법론 기반 임의 형태 방사선원에 대한 외부피폭 방사선량 평가 알고리즘 개발

  • Ju Young Kim (Department of Nuclear Engineering, Kyung Hee University) ;
  • Min Seong Kim (Department of Nuclear Engineering, Kyung Hee University) ;
  • Ji Woo Kim (Department of Nuclear Engineering, Kyung Hee University) ;
  • Kwang Pyo Kim (Department of Nuclear Engineering, Kyung Hee University)
  • 김주영 (경희대학교 원자력공학과) ;
  • 김민성 (경희대학교 원자력공학과) ;
  • 김지우 (경희대학교 원자력공학과) ;
  • 김광표 (경희대학교 원자력공학과)
  • Received : 2023.09.07
  • Accepted : 2023.09.20
  • Published : 2023.09.30
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Abstract

Workers in nuclear power plants are likely to be exposed to radiation from various geometrical sources. In order to evaluate the exposure level, the point-kernel method can be utilized. In order to perform a dose assessment based on this method, the radiation source should be divided into point sources, and the number of divisions should be set by the evaluator. However, for the general public, there may be difficulties in selecting the appropriate number of divisions and performing an evaluation. Therefore, the purpose of this study is to develop an algorithm for dose assessment for arbitrary shaped sources based on the point-kernel method. For this purpose, the point-kernel method was analyzed and the main factors for the dose assessment were selected. Subsequently, based on the analyzed methodology, a dose assessment algorithm for arbitrary shaped sources was developed. Lastly, the developed algorithm was verified using Microshield. The dose assessment procedure of the developed algorithm consisted of 1) boundary space setting step, 2) source grid division step, 3) the set of point sources generation step, and 4) dose assessment step. In the boundary space setting step, the boundaries of the space occupied by the sources are set. In the grid division step, the boundary space is divided into several grids. In the set of point sources generation step, the coordinates of the point sources are set by considering the proportion of sources occupying each grid. Finally, in the dose assessment step, the results of the dose assessments for each point source are summed up to derive the dose rate. In order to verify the developed algorithm, the exposure scenario was established based on the standard exposure scenario presented by the American National Standards Institute. The results of the evaluation with the developed algorithm and Microshield were compare. The results of the evaluation with the developed algorithm showed a range of 1.99×10-1~9.74×10-1 μSv hr-1, depending on the distance and the error between the results of the developed algorithm and Microshield was about 0.48~6.93%. The error was attributed to the difference in the number of point sources and point source distribution between the developed algorithm and the Microshield. The results of this study can be utilized for external exposure radiation dose assessments based on the point-kernel method.

Keywords

Acknowledgement

본 연구는 과학기술정보통신부의 재원으로 한국연구재단의 지원을 받아 수행한 가동원전 안전성 향상 핵심기술 개발사업의 연구결과입니다(No. RS-2022-00143994).

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