Effects of charge sharing in 3-D position sensitive CdZnTe gamma-ray spectrometers
Effects of charge sharing in 3-D position sensitive CdZnTe gamma-ray spectrometers
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DOI：
10.1016/s0168-9002(99)00841-4
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发表时间：
2000-01-11
影响因子：
1.4
通讯作者：
Du, YF
中科院分区：
文献类型：
--
作者：
He, Z;Li, W;Du, YF
用1cm（3）立方CdZnTe晶体制作了两台可在室温下工作的三维位置灵敏半导体γ谱仪。从11（x）x 11（y）x 20（z）体素中获得伽马射线光谱，每个体素对应于检测器体积中的0.7 x 0.7 x 0.5 mm。对来自2420个体素中的每一个体素的光谱进行电子捕获、加权电位的差异和读出电路的增益变化的校正。能量分辨率为1.70%（11.3 keV）的FWHM和1.84%（12.2 keV）的FWHM，在662 keV从整个体积的单像素事件的组合输出。已观察到相邻像素之间的电荷共享，并从这些实验数据估计电子云的大小。了解电子云的尺寸是很重要的未来探测器的设计使用像素电极。(C)2000 Elsevier Science B.V.保留所有权利。
Two 3-D position-sensitive semiconductor gamma-ray spectrometers operable at room temperature, have been fabricated using 1 cm(3) cubic CdZnTe crystals. gamma-Ray spectra have been obtained from 11(x) x 11(y) x 20(z) voxels, each corresponding to similar to 0.7 x 0.7 x 0.5 mm in the detector volume. Individual spectra from each of the 2420 voxels were corrected for electron trapping, differences in weighting potentials, and the gain variation of the readout circuitry. Energy resolutions of 1.70% (11.3 keV) FWHM and 1.84% (12.2 keV) FWHM were obtained at 662 keV from the combined output of the entire volume for single-pixel events. Charge sharing between neighboring pixels has been observed and the sizes of electron clouds are estimated from these experimental data. An understanding of electron cloud dimensions is important for the design of future detectors using pixellated electrodes. (C) 2000 Elsevier Science B.V. All rights reserved.