In this work, the spectroscopic performances of new cadmium–zinc–telluride (CZT) pixel detectors recently developed at IMEM‐CNR of Parma (Italy) are presented. Sub‐millimetre arrays with pixel pitch less than 500 µm, based on boron oxide encapsulated vertical Bridgman grown CZT crystals, were fabricated. Excellent room‐temperature performance characterizes the detectors even at high‐bias‐voltage operation (9000 V cm⁻¹), with energy resolutions (FWHM) of 4% (0.9 keV), 1.7% (1 keV) and 1.3% (1.6 keV) at 22.1, 59.5 and 122.1 keV, respectively. Charge‐sharing investigations were performed with both uncollimated and collimated synchrotron X‐ray beams with particular attention to the mitigation of the charge losses at the inter‐pixel gap region. High‐rate measurements demonstrated the absence of high‐flux radiation‐induced polarization phenomena up to 2 × 10⁶ photons mm⁻² s⁻¹. These activities are in the framework of an international collaboration on the development of energy‐resolved photon‐counting systems for high‐flux energy‐resolved X‐ray imaging.

中文翻译：

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垂直布里奇曼技术生长的镉锌碲化物像素探测器的室温X射线响应

在这项工作中，展示了最近在意大利帕尔马的IMEM-CNR上开发的新型镉锌碲化物（CZT）像素探测器的光谱性能。基于氧化硼封装的垂直布里奇曼生长的CZT晶体，制造了像素间距小于500 µm的亚毫米级阵列。即使在高偏压运行（9000 V cm ^-1），在22.1、59.5和122.1 keV时的能量分辨率（FWHM）分别为4％（0.9 keV），1.7％（1 keV）和1.3％（1.6 keV）。使用未准直和准直的同步加速器X射线束进行电荷共享研究，尤其要注意减轻像素间间隙区域的电荷损失。高速率测量表明在2×10 ^6个 光子mm ^-2  s ^-1范围内没有高通量辐射诱导的极化现象。这些活动是在为高通量能量分辨X射线成像开发能量分辨光子计数系统的国际合作框架内进行的。