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Proceedings Paper

Variations in pulse-height spectrum and pulse timing in CdZnTe pixel array detectors
Author(s): Joshua D. Eskin; H. Bradford Barber; Harrison H. Barrett
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Paper Abstract

The signal generated in pixel array detectors for gamma-ray imaging can be strikingly different from the signal seen in single-element detectors. When the pixel size is small compared with the detector thickness, the signal induced in the readout circuit becomes dominated by one charge carrier. If the small pixel is biased positive with respect to the continuous electrode the sensed signal will be due mostly to electron motion while the degrading effects of hole trapping and variation in interaction depth become far less important. To confirm experimentally the predictions of charge transport theory we fabricated CdZnTe test pixels of various sizes. Using a source of alpha radiation we measured the pulse timing properties for electron and hole transport as a function of pixel size. Pulse-height spectra were taken with gamma radiation from 99mTc. The results are in good agreement with the model for signal induction.

Paper Details

Date Published: 19 July 1996
PDF: 4 pages
Proc. SPIE 2859, Hard X-Ray/Gamma-Ray and Neutron Optics, Sensors, and Applications, (19 July 1996); doi: 10.1117/12.245122
Show Author Affiliations
Joshua D. Eskin, Health Sciences Ctr./Univ. of Arizona (United States)
H. Bradford Barber, Health Sciences Ctr./Univ. of Arizona (United States)
Harrison H. Barrett, Health Sciences Ctr./Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 2859:
Hard X-Ray/Gamma-Ray and Neutron Optics, Sensors, and Applications
Richard B. Hoover; F. Patrick Doty, Editor(s)

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