Analysis of detector response using 3-D position-sensitive CZT gamma-ray spectrometers

被引：17
|
作者：
Zhang, F [1 ]
He, Z [1 ]
Xu, D [1 ]
机构：
[1] Univ Michigan, Dept Nucl Engn & Radiol Sci, Ann Arbor, MI 48109 USA
来源：
IEEE TRANSACTIONS ON NUCLEAR SCIENCE | 2004年 / 51卷 / 06期
关键词：
CdZnTe; CZT; gamma-ray spectroscopy; ionization energy; position sensitive; spectrometer; trapping; weighting potential;
D O I：
10.1109/TNS.2004.839078
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Two 2.25-cm(3) CdZnTe gamma-ray spectrometers with three-dimensional (3-D) position sensitivity were constructed and tested. By using 11 x 11 pixellated, anodes and depth-sensing techniques, individual spectral data for each of similar to4800 voxels; were collected throughout the detector volume. Energy resolution of 1.11% and 1.14% FWHM at 662 KeV were obtained for single-pixel events from these two detectors, respectively. Spatial variations of electron mobility-lifetime product, energy resolution, photopeak efficiency, and total efficiency have been observed and analyzed. This analysis provides a direct observation on the uniformity of detector response (due to material, weighting potential, and electric field distribution) in 3-D. Possible defects in the detector are identified.. The impact of the spatial variation of detector response on a CZT gamma-ray spectrometer is discussed.
引用
收藏
页码：3098 / 3104
页数：7
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