Cadmium–zinc–telluride (CZT) pixel detectors represent a consolidated choice for the development of room‐temperature spectroscopic X‐ray imagers, finding important applications in medical imaging, often as detection modules of a variety of new SPECT and CT systems. Detectors with 3–5 mm thicknesses are able to efficiently detect X‐rays up to 140 keV giving reasonable room‐temperature energy resolution. In this work, the room‐temperature performance of 3 mm‐thick CZT pixel detectors, recently developed at IMEM/CNR of Parma (Italy), is presented. Sub‐millimetre detector arrays with pixel pitch less than 500 µm were fabricated. The detectors are characterized by good room‐temperature performance even at high bias voltage operation (6000 V cm⁻¹), with energy resolutions (FWHM) of 3% (1.8 keV) and 1.6% (2 keV) at 59.5 keV and 122.1 keV, respectively. Charge‐sharing investigations were performed with both uncollimated and collimated synchrotron X‐ray beams with particular attention to recovering the charge losses at the inter‐pixel gap region. High rate measurements demonstrated the absence of high‐flux radiation‐induced polarization phenomena up to 25 × 10⁶ photons mm⁻² s⁻¹.

中文翻译：

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3毫米厚亚毫米像素化镉锌碲化物像素探测器的室温性能。

镉锌碲化物（CZT）像素检测器代表了室温光谱X射线成像仪的开发的统一选择，在医学成像中找到了重要的应用，通常作为各种新型SPECT和CT系统的检测模块。厚度为3–5 mm的探测器能够有效检测高达140 keV的X射线，从而提供合理的室温能量分辨率。在这项工作中，介绍了最近在意大利帕尔马的IMEM / CNR开发的3毫米厚的CZT像素检测器的室温性能。制作了像素间距小于500 µm的亚毫米级探测器阵列。即使在高偏置电压操作（6000 V cm ^-1时），检测器也具有良好的室温性能。），在59.5 keV和122.1 keV时的能量分辨率（FWHM）分别为3％（1.8 keV）和1.6％（2 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，尤其要注意恢复像素间间隙区域的电荷损耗。高倍率测量表明，在高达25×10 ^6个 光子mm ^-2  s ^-1的情况下，没有高通量辐射诱发的极化现象。