基于SiPM的便携式NaI(TI)探测器设计

Design of Portable NaI(TI) Detector Based on SiPM

NaI(Tl)晶体是一种常见的辐射探测器材料,由于其与射线相互作用产生的是微弱光信号,因此需要使用光电倍增管将光信号转换为电信号供后级电路处理。硅光电倍增管(Silicon photo-multiplier,SiPM)作为一种新型光电转换器件,相较于传统的光电倍增管具有低噪声、体积小、低功耗和抗磁性等优点。基于SiPM,本工作设计研发了一款1英寸的NaI(Tl)探测器,该探测器具有体积小、本底噪声低的优点,通过优化探测器的物理结构和信号处理电路,实现了对γ射线的高效探测,同时还测试了探测器对^(137)Cs源的能谱影响,结果表明:探测器对0.662 MeV的γ射线能量分辨率为8.72%。

The NaI(Tl) crystal is a common material used in radiation detectors.Due to its interaction with radiation,it produces weak light signals,which need to be converted into electrical signals for processing by subsequent circuits using photomultiplier tubes(PMTs).Silicon photomultiplier(SiPM),as a novel type of light-to-electrical conversion device,offers advantages over traditional PMTs,including lower noise,smaller size,lower power consumption,and magnetic field resistance.Based on SiPM,this study designed and developed a 1-inch NaI(Tl) detector.The detector boasts small size and low background noise.Through optimization of the detector's physical structure and signal processing circuits,efficient detection of gamma rays was achieved.Additionally,the detector's impact on the energy spectrum of a ^(137)Cs source was tested,revealing an energy resolution of 8.72% for 0.662 MeV gamma rays.