Abbene Leonardo, Gerardi Gaetano, Principato Fabio, Buttacavoli Antonino, Altieri Saverio, Protti Nicoletta, Tomarchio Elio, Del Sordo Stefano, Auricchio Natalia, Bettelli Manuele, Amadè Nicola Sarzi, Zanettini Silvia, Zappettini Andrea, Caroli Ezio
Department of Physics and Chemistry (DiFC), University of Palermo, Viale delle Scienze, Edificio 18, Palermo 90128, Italy.
Nuclear Physics National Institute (INFN), Unit of Pavia, via Agostino Bassi 6, Pavia 27100, Italy.
J Synchrotron Radiat. 2020 Nov 1;27(Pt 6):1564-1576. doi: 10.1107/S1600577520010747. Epub 2020 Sep 25.
In the last two decades, great efforts have been made in the development of 3D cadmium-zinc-telluride (CZT) detectors operating at room temperature for gamma-ray spectroscopic imaging. This work presents the spectroscopic performance of new high-resolution CZT drift strip detectors, recently developed at IMEM-CNR of Parma (Italy) in collaboration with due2lab (Italy). The detectors (19.4 mm × 19.4 mm × 6 mm) are organized into collecting anode strips (pitch of 1.6 mm) and drift strips (pitch of 0.4 mm) which are negatively biased to optimize electron charge collection. The cathode is divided into strips orthogonal to the anode strips with a pitch of 2 mm. Dedicated pulse processing analysis was performed on a wide range of collected and induced charge pulse shapes using custom 32-channel digital readout electronics. Excellent room-temperature energy resolution (1.3% FWHM at 662 keV) was achieved using the detectors without any spectral corrections. Further improvements (0.8% FWHM at 662 keV) were also obtained through a novel correction technique based on the analysis of collected-induced charge pulses from anode and drift strips. These activities are in the framework of two Italian research projects on the development of spectroscopic gamma-ray imagers (10-1000 keV) for astrophysical and medical applications.
在过去二十年中，人们为开发用于伽马射线光谱成像的室温三维碲化镉锌（CZT）探测器付出了巨大努力。本文介绍了由意大利帕尔马的IMEM-CNR与意大利due2lab合作近期开发的新型高分辨率CZT漂移条探测器的光谱性能。探测器（19.4 mm×19.4 mm×6 mm）由收集阳极条（间距1.6 mm）和漂移条（间距0.4 mm）组成，这些条带带负偏压以优化电子电荷收集。阴极被分成与阳极条正交的条带，间距为2 mm。使用定制的32通道数字读出电子设备，对各种收集到的和感应的电荷脉冲形状进行了专门的脉冲处理分析。使用这些探测器在未进行任何光谱校正的情况下实现了出色的室温能量分辨率（在662 keV时为1.3%半高宽）。通过基于对阳极和漂移条收集到的感应电荷脉冲进行分析的新型校正技术，还实现了进一步的改进（在662 keV时为0.8%半高宽）。这些活动是两个意大利研究项目的一部分，该项目旨在开发用于天体物理和医学应用的光谱伽马射线成像仪（10 - 1000 keV）。
