Simulation design and performance evaluation of the wide-energy range gamma-ray imaging detectors
Authors:
- JiPeng ZHANGJZJiPeng ZHANG
- XinHua MAXMXinHua MA
- Bin ZhangBZBin Zhang
- Xiong XiaoXXXiong Xiao
- JingLun LIJLJingLun LI
- WenMing LEIWLWenMing LEI
- Wei ZhaoWZWei Zhao
- XianYun AIXAXianYun AI
- 18 May 2023
- journal article
- research article
- Published by Science China Press., Co. Ltd. in SCIENTIA SINICA Technologica
- Vol. 54 (1) , 31-42
Abstract
康普顿成像是直观感知核辐射的探测技术之一, 但因受限于探测器体积和成像事例的类型, 能量范围通常为0.3~3 MeV, 难以在对天然核素γ成像的基础上同时兼顾能量分布在3~7 MeV的瞬发γ成像应用. 覆盖0.3~7 MeV范围的宽能域γ成像是扩展核辐射探测与成像应用领域的重要发展方向之一, 基于两次散射的三层探测器结构是一种极具潜力的实现方案, 其中探测器的设计与构建是该方案的基础与关键核心. 考虑系统成本和扩展灵活性等因素, 本文选用硅光电倍增管(SiPM)阵列和钆镓铝石榴石(GAGG:Ce)阵列作为探测器材料. 根据三层探测器的成像事例要求, 分析每层探测器内的作用事例类型特征; 并基于Geant4蒙特卡罗模拟平台构建包含材料光学参数的仿真模型, 通过设置物理过程与两种信息提取方式, 对比研究了不同几何参数情形下的探测器位置散点图和探测器内作用事例类型统计结果. 根据仿真设计, 制备了由像素数为15×15, 像素大小为3.2×3.2 mm2, 厚度分别为3 mm和10 mm的GAGG阵列和1.25 mm厚度光导组成的两种规格SiPM探测器模块, 并基于电子学读出系统评估了探测器模块的性能. 结果表明, 3 mm厚度的散射探测器与10 mm厚度的吸收探测器均可清晰分辨15×15像素上的作用位置, 平均峰谷比分别为9.77和11.85; 全部像素的662 keV平均能量分辨率分别可达7.21%和8.35%, 具有较好的位置与能量分辨能力. 本文所建立的仿真模型, 分析结果以及所研制的探测器模块, 为三层探测器系统构建提供了重要依据, 并为实现宽能域γ成像奠定了科学技术基础.This publication has 20 references indexed in Scilit:
- Evaluation of Scintillator Detection Materials for Application within Airborne Environmental Radiation MonitoringSensors, 2019
- High-precision compton imaging of 4.4 MeV prompt gamma-ray toward an on-line monitor for proton therapyNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2019
- SiPM-based Compton camerasNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2019
- Studies on sub-millimeter LYSO:Ce, Ce:GAGG, and a new Ce:GFAG block detector for PET using digital silicon photomultiplierNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2018
- Optical characteristics of single crystal Gd3Al2Ga3O12 : CeModern Electronic Materials, 2018
- Recent advances in rare earth scintillation crystalsSCIENTIA SINICA Technologica, 2016
- Multiple scattering Compton camera with neutron activation for material inspectionNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2015
- The SiPM — A new Photon Detector for PETNuclear Physics B - Proceedings Supplements, 2006
- Geant4—a simulation toolkitNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2003
- Considerations for the next Compton telescope missionAIP Conference Proceedings, 2000