基于LaBr3(Ce)晶体耦合SiPM阵列的可变角分辨率伽玛相机的设计与研制

辐射防护 ›› 2023, Vol. 43 ›› Issue (1): 38-46.

基于LaBr₃(Ce)晶体耦合SiPM阵列的可变角分辨率伽玛相机的设计与研制

石伯轩^1,2, 李岩^1,2, 曹勤剑^1,2, 赵原^1,2, 夏三强^1,2, 王崇扬^1,2, 刘立业^1,2

1.中国辐射防护研究院,太原 030006;
2.辐射安全与防护山西省重点实验室,太原 030006

收稿日期:2022-08-11 出版日期:2023-01-20 发布日期:2023-03-20
通讯作者: 刘立业。E-mail: liuliye@cirp.org.cn
作者简介:石伯轩( 1982—),男,2003年毕业于清华大学工程物理系核工程与核技术专业,2007年毕业于日本东京大学系统量子工学系,获硕士学位,2010年毕业于日本东京力学原子力国际核工程与核技术专业,获博士学位,高级工程师。E-mail: shi_boxuan@163.com
基金资助:
大型公众活动核安保智能辐射探测系统研制(HH21050101)。

Design and development of a variable angular resolution gamma camera based on LaBr₃(Ce) crystal-coupled SiPM array

SHI Boxuan^1,2, LI Yan^1,2, CAO Qinjian^1,2, ZHAO Yuan^1,2, XIA Sanqiang^1,2, WANG Chongyang^1,2, LIU Liye^1,2

1. China Institute for Radiation Protection, Taiyuan 030006;
2. Shanxi Key Laboratory for Radiation Safety and Protection, Taiyuan 030006

Received:2022-08-11 Online:2023-01-20 Published:2023-03-20

摘要/Abstract

摘要： 编码孔径成像技术由于探测效率高、信噪比高、角分辨率好、成像质量稳定可靠等优点而广泛应用于核安全、核设施的去污及退役的测量、核医学等领域。建立通过改变编码准直器和探测器之间距离进而实现可变角分辨的伽玛成像系统。整个成像系统主要由编码准直器、位置灵敏探测(position sensitive detector,PSD)、数据采集卡以及图像重建系统组成。该成像系统的编码准直器采用修正均匀冗余阵列(modified uniformly redundant array,MURA)编码方式,为了保障对较高能量射线的探测能力,编码准直器的材料采用含钨量90%的钨铜合金,PSD通过LaBr₃(Ce)晶体耦合SiPM阵列组成,重建算法采用的是直接互卷积算法,快速高效。测试结果显示,整个位置灵敏探测器的平均能量分辨率为4.96%(662 keV);该辐射成像系统可以准确地对Am-241、Cs-137、Co-60进行清晰成像,并通过改变编码准直器和探测器之间的距离成功分辨出两个Cs-137点源的位置。

关键词: 伽玛射线探测, MURA编码方式, 编码孔径相机, LaBr₃(Ce)探测器

Abstract: Coded aperture imaging technology is widely used in nuclear safety, nuclear facility decontamination and decommissioning measurement as well as nuclear medicine due to its advantages of high detection efficiency, high signal-to-noise ratio, good angular resolution, and stable and reliable imaging quality. Aiming at the problems of the fixed imaging field of view and angular resolution of the traditional coded aperture gamma imaging system, a gamma imaging system with variable angular resolution is proposed by changing the distance between the coded collimator and the detector. The imaging system is mainly composed of coded collimator, position sensitive detector (PSD), data acquisition card and image reconstruction system. The coded collimator of the imaging system adopts the Modified Uniformly Redundant Array (MURA) coded method. In order to ensure the detection ability of higher energy rays, the material of the coding collimator adopts tungsten copper alloy with 90% tungsten content. The PSD is composed of LaBr₃(Ce) crystal coupled SiPM array, and the reconstruction algorithm adopts the direct convolution algorithm which is fast and efficient. The test results show that the average energy resolution of the PSD is 4.96% (662 keV). The radiation imaging system can accurately locate Am-241, Cs-137, and Co-60 clearly, and can successfully distinguish the positions of two Cs-137 point sources by changing the distance between the coded collimator and the detector.

Key words: gamma ray detection, MURA coded method, camera of coded aperture, LaBr₃(Ce) detector

中图分类号:

TL81

石伯轩, 李岩, 曹勤剑, 赵原, 夏三强, 王崇扬, 刘立业. 基于LaBr₃(Ce)晶体耦合SiPM阵列的可变角分辨率伽玛相机的设计与研制[J]. 辐射防护, 2023, 43(1): 38-46.

SHI Boxuan, LI Yan, CAO Qinjian, ZHAO Yuan, XIA Sanqiang, WANG Chongyang, LIU Liye. Design and development of a variable angular resolution gamma camera based on LaBr₃(Ce) crystal-coupled SiPM array[J]. RADIATION PROTECTION, 2023, 43(1): 38-46.

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基于LaBr₃(Ce)晶体耦合SiPM阵列的可变角分辨率伽玛相机的设计与研制

Design and development of a variable angular resolution gamma camera based on LaBr₃(Ce) crystal-coupled SiPM array

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