LYSO:Ce电子辐射探测器输出响应影响因素研究  

Study on the factors influencing the output response of LYSO:Ce electron radiation detector

作　　者：孟宗[1] 刘浩 刘京波 王航 MENG Zong;LIU Hao;LIU Jingbo;WANG Hang(School of Electrical Engineering,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]燕山大学电气工程学院,秦皇岛066004

出　　处：《核技术》2024年第2期84-92,共9页Nuclear Techniques

摘　　要：针对地球静止轨道(Geostationary Earth Orbit,GEO)空间粒子辐射对卫星在轨运行时产生的电离总剂量效应,将高性能铈掺杂硅酸钇镥(LYSO:Ce)晶体与铝层结合,来屏蔽质子辐照影响,实现电子辐射剂量的有效探测。基于Geant4建立探测器模型,比较不同材料的屏蔽效果,分析探测器响应特性,研究影响探测器输出响应的因素。结果表明:使用0.022 mm厚的铝层作为屏蔽层包裹光纤,可排除质子辐照影响;基于LYSO:Ce晶体的探测器具有较好的线性响应,电子穿越屏蔽层时产生的次级电子、光子可以提高探测器响应灵敏度;物质对电子的电离阻止本领与入射电子速度的平方近似成反比,适当增加电子与探测器之间传输距离,可增强探测器的辐射响应;探测器对能量区间在0.04~1 MeV的电子探测效率最高。通过研究LYSO:Ce晶体与铝层结合的电子辐射剂量探测器特性,为新型闪烁体空间辐射探测器设计提供技术参考和理论支撑。[Background]The total dose effect of ionization on satellites in Geostationary Earth Orbit(GEO)is caused by space particle radiation in GEO.[Purpose]This study aims to combine high-performance cerium-doped yttrium-lutetium silicate(LYSO:Ce)crystals with an aluminum layer to shield the effect of proton irradiation for effective electron radiation dose detection.[Methods]Firstly,the detector model was established using Geant4,the shielding effects of different materials for LYSO:Ce detector were compared.Then,the response characteristics of the detector were analyzed,and the factors affecting the output response of the detector at different shielding layer thicknesses were investigated.[Results]The results showed that the effect of proton irradiation can be eliminated by using 0.022 mm aluminum as the shielding layer.The LYSO:Ce crystal-based detector has a good linear response,and the secondary electrons and photons generated when electrons pass through the shield improve the response sensitivity of the detector.The ionization stopping power of the electron is approximately inversely proportional to the square of the incident electron velocity,and the detector response to radiation is enhanced when the transmission distance between the electron and the detector was appropriately increased.The highest electron detection efficiency of the detector occurs in the energy range of 0.04~1 MeV.[Conclusions]This study on the characteristics of electron radiation dose detector on the basis of LYSO:Ce crystals combined with an aluminum layer provides a technical reference and theoretical support for designing new scintillator space radiation detectors.

关 键 词：LYSO:Ce GEANT4 电子辐射 剂量探测器 

分 类 号：TL812[核科学技术—核技术及应用]