Signals induced in semiconductor gamma-ray imaging detectors

被引:117
作者
Eskin, JD
Barrett, HH
Barber, HB
机构
[1] Univ Arizona, Ctr Opt Sci, Tucson, AZ 85724 USA
[2] Univ Arizona, Dept Radiol, Tucson, AZ 85724 USA
关键词
D O I
10.1063/1.369198
中图分类号
O59 [应用物理学];
学科分类号
摘要
The signal induced in a readout circuit connected to a pixel electrode in a semiconductor gamma-ray imaging array is calculated by solving the Laplace equation. Two approaches are presented that use Green functions in solving the boundary value problem: decomposition into basis functions, and construction of an infinite series of image charges. Another approach is developed based on the Ramo-Shockley theorem, which makes use of weighting potentials. These potentials may be readily calculated in three dimensions using a Fourier-transform propagation technique. An analytic solution is found for the special two-dimensional case of a strip detector. Experiments on CdZnTe square-pixel test structures using alpha radiation confirm the expected trends in pulse shape as a function of pixel size. Signals observed simultaneously on adjacent pixels also follow the predicted division of currents. Trends with pixel size are also confirmed in the shape of pulse-height spectra taken using a Tc-99m source. (C) 1999 American Institute of Physics. [S0021-8979(99)03302-2].
引用
收藏
页码:647 / 659
页数:13
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