감마핵종 In-Situ 측정 연구 동향 분석 및 방사능 측정 효율 민감도 평가
In-Situ Gamma Spectrometry Research Analysis and Radiation Efficiency Sensitivity Evaluation
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Since a large amount of radioactive waste is expected to be generated due to permanentshutdown of many nuclear power plants, it is necessary to prepare efficient management methods forradioactive waste. Therefore, there is a need for a based study to apply the In-Situ gamma spectrometry,which can simplify the measurement procedure. The purpose of this study is to analyze research casesof In-Situ gamma spectrometry and to analyze the sensitivity of measurement according to influencingfactors on In-Situ gamma spectrometry. Research cases of five institutions, including the CERN and theImperial College Reactor Centre (ICRC), were selected as the institutions to be investigated. Researchon the In-Situ gamma spectrometry was conducted on the satisfaction of the acceptance criteria forradioactive waste and the analysis of residual radioactivity in the site. In-Situ Objective Counting System(ISOCS) was used as a major measuring device. Sampling and computer code were used to verify theanalysis results. For evaluation of measuring sensitivity according to influencing factors on In-Situgamma spectrometry, the thickness of the measurement target, the distance between the detector andthe target, the angle of the collimator, and the contamination location were performed using ISOCS’sGeometry Composer. In every case, based on 122 keV, the efficiency decreased as the energy increased inthe high energy region, and the efficiency decreased as the energy decreased in the low energy region. Asthe target thickness increased, the efficiency decreased, and as the distance between target and detectorincreased, the efficiency decreased. As the distance between contamination and detector increased, theefficiency decreased, and as the angle of the collimator increased, the measurement efficiency increased. However, when simulating the measurement situation using Geometry Composer, the background is notconsidered, and the probability of incident in the background increases as the angle increases, so furtherresearch needs to be conducted in consideration of these. This study can be utilized when applying the In-Situ gamma spectrometry of radioactive waste clearance in the future.
Abstract
Since a large amount of radioactive waste is expected to be generated due to permanentshutdown of many nuclear power plants, it is necessary to prepare efficient management methods forradioactive waste. Therefore, there is a need for a based study to apply the In-Situ gamma spectrometry,which can simplify the measurement procedure. The purpose of this study is to analyze research casesof In-Situ gamma spectrometry and to analyze the sensitivity of measurement according to influencingfactors on In-Situ gamma spectrometry. Research cases of five institutions, including the CERN and theImperial College Reactor Centre (ICRC), were selected as the institutions to be investigated. Researchon the In-Situ gamma spectrometry was conducted on the satisfaction of the acceptance criteria forradioactive waste and the analysis of residual radioactivity in the site. In-Situ Objective Counting System(ISOCS) was used as a major measuring device. Sampling and computer code were used to verify theanalysis results. For evaluation of measuring sensitivity according to influencing factors on In-Situgamma spectrometry, the thickness of the measurement target, the distance between the detector andthe target, the angle of the collimator, and the contamination location were performed using ISOCS’sGeometry Composer. In every case, based on 122 keV, the efficiency decreased as the energy increased inthe high energy region, and the efficiency decreased as the energy decreased in the low energy region. Asthe target thickness increased, the efficiency decreased, and as the distance between target and detectorincreased, the efficiency decreased. As the distance between contamination and detector increased, theefficiency decreased, and as the angle of the collimator increased, the measurement efficiency increased. However, when simulating the measurement situation using Geometry Composer, the background is notconsidered, and the probability of incident in the background increases as the angle increases, so furtherresearch needs to be conducted in consideration of these. This study can be utilized when applying the In-Situ gamma spectrometry of radioactive waste clearance in the future.
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