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Proceedings Paper

3D position-sensitive CdZnTe gamma-ray spectrometers: improved performance with new ASICs
Author(s): Feng Zhang; Zhong He
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Paper Abstract

A 3-dimensional position sensitive CdZnTe gamma-ray spectrometer based on VAS3.1/TAT3 ASICs was developed and tested. The 3-D CZT spectrometer employs a 1.5 cm x 1.5 cm x 1 cm3 CdZnTe crystal with 11 by 11 pixelated anodes wire-bonded to the readout electronics. The signals from the anode pixels and the cathode were both read out through the ASICs. The pixel position provides the lateral 2-D coordinates, while the third coordinate can be determined by using depth-sensing techniques. With the help of 3-D position sensitivity, the variation in weighting potential, electron trapping and material non-uniformity can be mitigated to the scale of the position resolution, estimated to be 1.27 mm x 1.27 mm x 0.2 mm. The energies and 3-D coordinates can be reconstructed for multiple interaction events from a single incident gamma ray. The third-generation ASICs - VAS3.1/TAT3 has been developed to improve the electronic noise, uniformity, linearity and stability. Energy resolution of 0.93% FWHM and 1.52% FWHM have been achieved for single-pixel events and two-pixel events, respectively, including ~4.5 keV FWHM electronic noise.

Paper Details

Date Published: 21 October 2004
PDF: 9 pages
Proc. SPIE 5540, Hard X-Ray and Gamma-Ray Detector Physics VI, (21 October 2004); doi: 10.1117/12.563903
Show Author Affiliations
Feng Zhang, Univ. of Michigan/Ann Arbor (United States)
Zhong He, Univ. of Michigan/Ann Arbor (United States)

Published in SPIE Proceedings Vol. 5540:
Hard X-Ray and Gamma-Ray Detector Physics VI
Arnold Burger; Ralph B. James; Larry A. Franks, Editor(s)

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