Meng L J, He Z, Alexander B, Sandoval J
Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109 USA.
Constellation Technology Corporation, Largo, FL 33777 USA.
IEEE Trans Nucl Sci. 2006 Jun;53(3):1706-1712. doi: 10.1109/TNS.2006.873714. Epub 2006 Jun 26.
This paper presents the spectroscopic performance of two newly developed pixelated HgI detectors. These detectors are 1 × 1 × 0.814 cm and 1 × 1 × 1.016 cm in size. Each detector has four closely packed 1 × mm anode pixels at the center of one of the 1 × 1 cm surfaces. These anode pixels are surrounded by a large anode. All results presented here are based on events from a sub-volume underneath the anode pixels. In these detectors, signals were read out by a discrete electronics based on multiple A-250 pre-amplifiers and a digital oscilloscope for sampling pulse waveforms. Depth sensing technique was used to correct the depth-dependent variation in photopeak amplitude. Main results presented are: (1) energy resolutions of 0.85 ~ 1.3% have been achieved on these detectors; (2) the electron mobility-lifetime product was measured to be ~1 × 10 cm/V and the measured electron lifetime was ~200 s and (3) variation in electron drifting properties under different anode pixels were observed. Significant non-uniformity in internal electric field strength was also experimentally demonstrated.
本文介绍了两种新开发的像素化碘化汞探测器的光谱性能。这些探测器的尺寸分别为1×1×0.814厘米和1×1×1.016厘米。每个探测器在1×1厘米表面之一的中心有四个紧密排列的1×毫米阳极像素。这些阳极像素被一个大阳极包围。这里呈现的所有结果都是基于阳极像素下方子体积中的事件。在这些探测器中，信号由基于多个A - 250前置放大器和用于采样脉冲波形的数字示波器的分立电子设备读出。采用深度传感技术来校正光峰幅度中与深度相关的变化。呈现的主要结果如下：（1）这些探测器实现了0.85%至1.3%的能量分辨率；（2）测得电子迁移率 - 寿命乘积约为1×10厘米²/伏，测得的电子寿命约为200微秒；（3）观察到不同阳极像素下电子漂移特性的变化。还通过实验证明了内部电场强度存在显著的不均匀性。
