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Design and Performance Prediction of Large-area Hybrid Gamma Imaging System (LAHGIS) for Localization of Low-level Radioactive Material
Nuclear Engineering and Technology ( IF 2.7 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.net.2020.09.008 Hyun Su Lee , Jae Hyeon Kim , Junyoung Lee , Chan Hyeong Kim
Nuclear Engineering and Technology ( IF 2.7 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.net.2020.09.008 Hyun Su Lee , Jae Hyeon Kim , Junyoung Lee , Chan Hyeong Kim
Abstract In the present study, a large-area hybrid gamma imaging system was designed by adopting coded aperture imaging on the basis of a large-area Compton camera to achieve high imaging performance throughout a broad energy range (100–2000 keV). The system consisting of a tungsten coded aperture mask and monolithic NaI(Tl) scintillation detectors was designed through a series of Geant4 Monte Carlo radiation transport simulations, in consideration of both imaging sensitivity and imaging resolution. Then, the performance of the system was predicted by Geant4 Monte Carlo simulations for point sources under various conditions. Our simulation results show that the system provides very high imaging sensitivity (i.e., low values for minimum detectable activity, MDA), thus allowing for imaging of low-activity sources at distances impossible with coded aperture imaging or Compton imaging alone. In addition, the imaging resolution of the system was found to be high (i.e., around 6°) over the broad energy range of 59.5–1330 keV.
中文翻译:
用于低放射性物质定位的大面积混合伽马成像系统(LAHGIS)的设计和性能预测
摘要 在本研究中,在大面积康普顿相机的基础上,采用编码孔径成像设计了一种大面积混合伽马成像系统,以在宽能量范围(100-2000 keV)内实现高成像性能。考虑到成像灵敏度和成像分辨率,通过一系列 Geant4 Monte Carlo 辐射传输模拟设计了由钨编码孔径掩模和单片 NaI(Tl) 闪烁探测器组成的系统。然后,系统的性能通过 Geant4 Monte Carlo 模拟在各种条件下对点源进行预测。我们的模拟结果表明,该系统提供了非常高的成像灵敏度(即最低可检测活动的低值 MDA),因此,可以在单独使用编码孔径成像或康普顿成像无法实现的距离对低活度源进行成像。此外,发现该系统的成像分辨率在 59.5-1330 keV 的宽能量范围内很高(即大约 6°)。
更新日期:2020-09-01
中文翻译:
用于低放射性物质定位的大面积混合伽马成像系统(LAHGIS)的设计和性能预测
摘要 在本研究中,在大面积康普顿相机的基础上,采用编码孔径成像设计了一种大面积混合伽马成像系统,以在宽能量范围(100-2000 keV)内实现高成像性能。考虑到成像灵敏度和成像分辨率,通过一系列 Geant4 Monte Carlo 辐射传输模拟设计了由钨编码孔径掩模和单片 NaI(Tl) 闪烁探测器组成的系统。然后,系统的性能通过 Geant4 Monte Carlo 模拟在各种条件下对点源进行预测。我们的模拟结果表明,该系统提供了非常高的成像灵敏度(即最低可检测活动的低值 MDA),因此,可以在单独使用编码孔径成像或康普顿成像无法实现的距离对低活度源进行成像。此外,发现该系统的成像分辨率在 59.5-1330 keV 的宽能量范围内很高(即大约 6°)。