基于快响应晶体和硅光电倍增管(SiPM)读出的硬X射线及γ射线位置灵敏探测研究

There is a need in the fields of high-energy astronomy and solar physics for new hard-energy X-ray and gamma-ray detectors capable of making sensitive observations of different sources over a wide dynamic range. A new scintillator with Silicon photomultiplier (SiPM) readouts is a promising solution and has a broad application prospect, since the fast response of the scintillators permits both the rejection of background and the ability to operate at high count rates. We present a concept for a position sensitive detector module in the hard X-ray energy extending to few keV making use of modern scintillator materials with SiPM readouts. In this project, a combination of experiments, theory, and simulation was used to establish a position-sensitive algorithm to read out the spectrum and position information simultaneously through the SiPM arrays.

当前高能天文学和太阳物理研究需要新的硬X射线和γ射线探测方案，来提供大动态范围内不同源的高精度观测结果。新闪烁体和硅光电倍增管(SiPM)的解决方案，由于其快时间响应可以同时降低本底和高计数率下工作，具有广阔的应用前景。本项目提出了一种采用新闪烁体材料且使用SiPM读出的位置灵敏探测器模型，可探测低能硬X射线。本项目采用实验与理论、模拟相结合，建立位置灵敏算法，通过SiPM阵列同时读出能谱和位置信息。

快时间响应闪烁体采用硅光电倍增管(SiPM)读出，可以在探索大动态范围探测的同时获取时间信息，有助于拓展空间望远镜的探测性能。本项目基于大动态范围和时间信息获取展开研究。我们研究了溴化澜晶体不同的封装工艺，研制了一套数据采集电子学系统，总探动态范围可达 5.9 keV ~ 3 MeV 。同时，建立了一套评估快响应晶体位置分辨能力的蒙卡模拟程序，评估小晶体位置灵敏方案，并对细长GAGG晶体的双端读出的位置分辨能力进行了测试和研究。