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학술저널
저자정보
유수아 (한국원자력의학원) 권나혜 (연세대학교 의과대학) 장영재 (한국원자력의학원) 이병채 (세안에너텍) 유지현 (세안에너텍 (주)) 김동욱 (연세대학교) 조규석 (한국원자력의학원) 김금배 (한국원자력의학원) 김근범 (한국원자력의학원) 백철하 (강원대학교) 최상현 (한국원자력의학원)
저널정보
한국의학물리학회 의학물리 의학물리 제33권 제4호
발행연도
2022.12
수록면
129 - 135 (7page)
DOI
10.14316/pmp.2022.33.4.129

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Purpose: A full-energy-peak (FEP) efficiency correction is required through a Monte Carlo simulation for accurate radioactivity measurement, considering the geometrical characteristics of the detector and the sample. However, a relative deviation (RD) occurs between the measurement and calculation efficiencies when modeling using the data provided by the manufacturers due to the randomly generated dead layer. This study aims to optimize the structure of the detector by determining the dead layer thickness based on Monte Carlo simulation. Methods: The high-purity germanium (HPGe) detector used in this study was a coaxial p-type GC2518 model, and a certified reference material (CRM) was used to measure the FEP efficiency. Using the MC N-Particle Transport Code (MCNP) code, the FEP efficiency was calculated by increasing the thickness of the outer and inner dead layer in proportion to the thickness of the electrode. Results: As the thickness of the outer and inner dead layer increased by 0.1 mm and 0.1 μm, the efficiency difference decreased by 2.43% on average up to 1.0 mm and 1.0 μm and increased by 1.86% thereafter. Therefore, the structure of the detector was optimized by determining 1.0 mm and 1.0 μm as thickness of the dead layer. Conclusions: The effect of the dead layer on the FEP efficiency was evaluated, and an excellent agreement between the measured and calculated efficiencies was confirmed with RDs of less than 4%. It suggests that the optimized HPGe detector can be used to measure the accurate radioactivity using in dismantling and disposing medical linear accelerators.

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