标题： 厚块状CeBr3和LaBr3:Ce闪烁体中伽马射线作用点的定位 显示英文标题

标题： Localisation of gamma-ray interaction points in thick monolithic CeBr3 and LaBr3:Ce scintillators

摘要： 单块闪烁晶体中伽马射线相互作用点的定位可以简化未来用于伽马射线天文学的康普顿望远镜的设计并提高其性能。 在本文中，我们比较了三种单块闪烁晶体的位置分辨率：一个28x28x20 mm3（长度x宽度x厚度）的LaBr3:Ce晶体，一个25x25x20 mm3的CeBr3晶体和一个25x25x10 mm3的CeBr3晶体。 每个晶体都被封装并通过光学窗口与4x4硅光电倍增管阵列耦合。 测量使用来自准直的133Ba源的81 keV和356 keV伽马射线进行。 使用人工神经网络对相互作用点进行了三维位置重建，该神经网络通过实验数据进行训练。 尽管较薄的晶体位置分辨率显著更好，但20 mm厚的CeBr3晶体在356 keV时x和y坐标的位置分辨率约为5.4 mm FWHM，z坐标（晶体深度）的位置分辨率为7.8 mm FWHM。 这些值是通过对晶体侧面的完整位置扫描获得的。 发现LaBr3:Ce晶体的位置分辨率明显较差，可能是由于晶体和封装光学窗口之间的高度扩散性光学界面。 对于662 keV伽马射线测得的能量分辨率（FWHM）为4.0%对于LaBr3:Ce和5.5%对于CeBr3。 同样配备光电倍增管（Hamamatsu R6322-100）的晶体分别给出了3.0%和4.7%的能量分辨率。 显示英文摘要

摘要： Localisation of gamma-ray interaction points in monolithic scintillator crystals can simplify the design and improve the performance of a future Compton telescope for gamma-ray astronomy. In this paper we compare the position resolution of three monolithic scintillators: a 28x28x20 mm3 (length x breadth x thickness) LaBr3:Ce crystal, a 25x25x20 mm3 CeBr3 crystal and a 25x25x10 mm3 CeBr3 crystal. Each crystal was encapsulated and coupled to an array of 4x4 silicon photomultipliers through an optical window. The measurements were conducted using 81 keV and 356 keV gamma-rays from a collimated 133Ba source. The 3D position reconstruction of interaction points was performed using artificial neural networks trained with experimental data. Although the position resolution was significantly better for the thinner crystal, the 20 mm thick CeBr3 crystal showed an acceptable resolution of about 5.4 mm FWHM for the x and y coordinates, and 7.8 mm FWHM for the z-coordinate (crystal depth) at 356 keV. These values were obtained from the full position scans of the crystal sides. The position resolution of the LaBr3:Ce crystal was found to be considerably worse, presumably due to the highly diffusive optical in- terface between the crystal and the optical window of the enclosure. The energy resolution (FWHM) measured for 662 keV gamma-rays was 4.0% for LaBr3:Ce and 5.5% for CeBr3. The same crystals equipped with a PMT (Hamamatsu R6322-100) gave an energy resolution of 3.0% and 4.7%, respectively.