Point-kernel 방법론 기반 임의 형태 방사선원에 대한 외부피폭 방사선량 평가 알고리즘 개발
Development of Radiation Dose Assessment Algorithm for Arbitrary Geometry Radiation Source Based on Point-kernel Method
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Workers in nuclear power plants are likely to be exposed to radiation from variousgeometrical 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 dividedinto point sources, and the number of divisions should be set by the evaluator. However, for the generalpublic, there may be difficulties in selecting the appropriate number of divisions and performing anevaluation. Therefore, the purpose of this study is to develop an algorithm for dose assessment forarbitrary shaped sources based on the point-kernel method. For this purpose, the point-kernel methodwas analyzed and the main factors for the dose assessment were selected. Subsequently, based onthe 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 thedeveloped algorithm consisted of 1) boundary space setting step, 2) source grid division step, 3) the setof point sources generation step, and 4) dose assessment step. In the boundary space setting step, theboundaries of the space occupied by the sources are set. In the grid division step, the boundary space isdivided into several grids. In the set of point sources generation step, the coordinates of the point sourcesare set by considering the proportion of sources occupying each grid. Finally, in the dose assessmentstep, 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 standardexposure scenario presented by the American National Standards Institute. The results of the evaluationwith the developed algorithm and Microshield were compare. The results of the evaluation with thedeveloped algorithm showed a range of 1.99×10-1~9.74×10-1 μSv hr-1, depending on the distance and theerror between the results of the developed algorithm and Microshield was about 0.48~6.93%. The errorwas attributed to the difference in the number of point sources and point source distribution between thedeveloped algorithm and the Microshield. The results of this study can be utilized for external exposureradiation dose assessments based on the point-kernel method.
Abstract
Workers in nuclear power plants are likely to be exposed to radiation from variousgeometrical 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 dividedinto point sources, and the number of divisions should be set by the evaluator. However, for the generalpublic, there may be difficulties in selecting the appropriate number of divisions and performing anevaluation. Therefore, the purpose of this study is to develop an algorithm for dose assessment forarbitrary shaped sources based on the point-kernel method. For this purpose, the point-kernel methodwas analyzed and the main factors for the dose assessment were selected. Subsequently, based onthe 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 thedeveloped algorithm consisted of 1) boundary space setting step, 2) source grid division step, 3) the setof point sources generation step, and 4) dose assessment step. In the boundary space setting step, theboundaries of the space occupied by the sources are set. In the grid division step, the boundary space isdivided into several grids. In the set of point sources generation step, the coordinates of the point sourcesare set by considering the proportion of sources occupying each grid. Finally, in the dose assessmentstep, 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 standardexposure scenario presented by the American National Standards Institute. The results of the evaluationwith the developed algorithm and Microshield were compare. The results of the evaluation with thedeveloped algorithm showed a range of 1.99×10-1~9.74×10-1 μSv hr-1, depending on the distance and theerror between the results of the developed algorithm and Microshield was about 0.48~6.93%. The errorwas attributed to the difference in the number of point sources and point source distribution between thedeveloped algorithm and the Microshield. The results of this study can be utilized for external exposureradiation dose assessments based on the point-kernel method.
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