IMEM-CNR, Parco Area Delle Scienze 37A, 43124, Parma, Italy.
Due2Lab S.R.L, Via P. Borsellino 2, 42019, Scandiano, RE, Italy.
Sci Rep. 2023 Feb 24;13(1):3212. doi: 10.1038/s41598-023-30181-2.
In this paper we present the development of quasi-hemispherical gamma-ray detectors based on CdZnTe. Among the possible single-polarity electrode configurations, such as coplanar, pixelated, or virtual Frisch-grid geometries, quasi-hemispherical detectors are the most cost-effective alternative with comparable raw energy resolution in the high and low energy range. The optimal configuration of the sensor in terms of dimension of the crystals and electrode specifications has been first determined by simulations, and successively validated with experimental measures. Spectra from different sources have been acquired to evaluate the detectors performances. Three types of detectors with different CZT volumes have been fabricated, namely 10 × 10 × 5 mm, 15 × 15 × 10 mm and 20 × 20 × 10 mm. In the case of 10 × 10 × 5 mm crystals, the optimum pixel size determined by our simulation tool was confirmed by experiments: the best spectroscopic resolution of 1.3% at 662 keV has been found for a 750 μm diameter pixel detector. The best energy resolution values obtained for the 15 × 15 × 10 mm and 20 × 20 × 10 mm detectors were respectively 1.7% and 2.7% at 662 keV.
在本文中，我们介绍了基于 CdZnTe 的类半球形伽马射线探测器的研制。在可能的单极电极配置中，如共面、像素化或虚拟 Frisch 栅格几何形状，类半球形探测器是最具成本效益的选择，在高低能范围内具有可比的原始能量分辨率。通过模拟首先确定了传感器在晶体尺寸和电极规格方面的最佳配置，然后通过实验测量进行了验证。从不同的源获取了光谱来评估探测器的性能。已经制造了三种具有不同 CZT 体积的探测器，即 10×10×5mm、15×15×10mm 和 20×20×10mm。在 10×10×5mm 晶体的情况下，我们的模拟工具确定的最佳像素尺寸通过实验得到了证实：对于 750μm 直径的像素探测器，最佳光谱分辨率为 1.3%，在 662keV。对于 15×15×10mm 和 20×20×10mm 探测器，获得的最佳能量分辨率值分别为 662keV 时的 1.7%和 2.7%。
