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首页> 外文会议>Conference on physics of medical imaging >6-Li Enriched Cs2LiYCl6:Ce Based Thermal Neutron Detector Coupled with CMOS Solid-State Photomultipliers for a Portable Detector Unit
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6-Li Enriched Cs2LiYCl6:Ce Based Thermal Neutron Detector Coupled with CMOS Solid-State Photomultipliers for a Portable Detector Unit

机译：基于6 Li的富含Cs2LiYCl6：Ce的热中子探测器和CMOS固态光电倍增管，用于便携式探测器单元

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摘要

For detecting neutrons, 3-He tubes provide sensitivity and a unique capability for detecting and discriminating neutron signals from background gamma-ray signals. A solid-state scintillation-based detector provides an alternative to 3-He for neutron detection. A real-time, portable, and low cost thermal neutron detector has been constructed from a ~6Li-enriched Cs_2LiYCl_6:Ce (CLYC) scintillator crystal coupled with a CMOS solid-state photomultiplier (SSPM). These components are fully integrated with a miniaturized multi-channel analyzer (MCA) unit for calculation and readout of the counts and count rates. CLYC crystals and several other elpasolites including Cs_2LiLaCl_6:Ce (CLLC) and Cs_2LiLaBr_6:Ce (CLLB) have been considered for their unique properties in detecting neutrons and discriminating gamma ray events along with providing excellent energy resolution comparable to Nal(Tl) scintillators. CLYC's slower rise and decay time for neutrons (70ns and 900ns respectively) relative to a faster rise and decay time for gamma ray events (6ns and 55ns respectively) allows for pulse shape discrimination in mixed radiation fields.1 Light emissions from CLYC crystals are detected using an array of avalanche photodiodes referred to as solid-state photomultipliers. SSPMs are binary photon counting devices where the number of pixels activated is directly proportional to the light output of the CLYC scintillator which is proportional to the energy deposited from the radiation field. SSPMs can be fabricated using standard CMOS processes and inherently contain the low noise performance associated with ordinary photomultiplier tubes (PMT) while providing a light and compact solution for portable neutron detectors.
机译：为了检测中子，3-He管提供了灵敏度和独特的能力，可以从背景伽马射线信号中检测和区分中子信号。基于固态闪烁的探测器可替代3-He用于中子探测。实时，便携式且低成本的热中子探测器是由〜6Li富集的Cs_2LiYCl_6：Ce（CLYC）闪烁晶体与CMOS固态光电倍增管（SSPM）耦合而成的。这些组件与小型多通道分析仪（MCA）单元完全集成在一起，用于计算和读取计数和计数率。 CLYC晶体和包括Cs_2LiLaCl_6：Ce（CLLC）和Cs_2LiLaBr_6：Ce（CLLB）在内的其他几种锂辉石因其在检测中子和区分伽玛射线事件方面的独特性能而被认为具有独特的性能，同时还具有可与Nal（Tl）闪烁体媲美的出色能量分辨率。 CLYC中子的上升和衰减时间（分别为70ns和900ns）较慢，而伽马射线事件的上升和衰减时间（分别为6ns和55ns）较快，因此可以在混合辐射场中识别脉冲形状。1检测到CLYC晶体的光发射使用称为固态光电倍增管的雪崩光电二极管阵列。 SSPM是二进制光子计数设备，其中激活的像素数与CLYC闪烁体的光输出成正比，而CLYC闪烁体的光输出与从辐射场沉积的能量成正比。 SSPM可以使用标准CMOS工艺制造，并且固有地具有与普通光电倍增管（PMT）相关的低噪声性能，同时为便携式中子探测器提供了轻巧紧凑的解决方案。

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