Variations in pulse-height spectrum and pulse timing in CdZnTe pixel array detectors

Book · Tue Dec 31 04:00:00 EST 1996

OSTI ID:524738

Eskin, J D; Barber, H B; Barrett, H H ^[1]

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1. Univ. of Arizona, Tucson, AZ (United States)

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 the authors fabricated CdZnTe test pixels of various sizes. Using a source of alpha radiation they 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 {sup 99m}Tc. The results are in good agreement with the model for signal induction.

• OSTI ID: 524738
• Report Number(s): CONF-960848--; ISBN 0-8194-2247-9
• Country of Publication: United States
• Language: English

Related Subjects

44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
55 BIOLOGY AND MEDICINE
BASIC STUDIES
CADMIUM TELLURIDES
CHARGE TRANSPORT
EXPERIMENTAL DATA
GAMMA DETECTION
NUCLEAR MEDICINE
PERFORMANCE TESTING
SEMICONDUCTOR DETECTORS
TIMING PROPERTIES
ZINC TELLURIDES