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Proceedings Paper

Further studies of single-sided charge-sharing CZT strip detectors
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Paper Abstract

We report progress in the study of a thick CZT strip detector module designed to perform gamma-ray spectroscopy and 3-D imaging. We report preliminary performance measurements of 7.5 mm thick single-sided charge-sharing strip detector prototype devices. This design features both row and column contacts on the anode surface. This electron-only approach addresses problems associated with poor hole transport in CZT that limit the thickness and energy range of double-sided strip detectors. This work includes laboratory and simulation studies aimed at developing compact, efficient, detector modules for 0.05 to 1 MeV gamma measurements while minimizing the number and complexity of the electronic readout channels. This is particularly important in space-based coded aperture and Compton telescope instruments that require large area, large volume detector arrays. Such arrays will be required for the NASA Black Hole Finder Probe (BHFP)and Advanced Compton Telescope (ACT). This new design requires an anode pattern with contacts whose dimensions and spacing are roughly the size of the ionization charge cloud. The first prototype devices have 125 μm anode contacts on 225 μm pitch. Our results demonstrate the principle of operation but suggest that even finer anode contact feature sizes will be necessary to achieve the desired performance.

Paper Details

Date Published: 16 September 2005
PDF: 9 pages
Proc. SPIE 5922, Hard X-Ray and Gamma-Ray Detector Physics VII, 59220H (16 September 2005); doi: 10.1117/12.617297
Show Author Affiliations
Burcin Donmez, Univ. of New Hampshire (United States)
John R. Macri, Univ. of New Hampshire (United States)
Mark L. McConnell, Univ. of New Hampshire (United States)
James M. Ryan, Univ. of New Hampshire (United States)
Mark Widholm, Univ. of New Hampshire (United States)
Tomohiko Narita, College of the Holy Cross (United States)
Louis-Andre Hamel, Univ. de Montreal (Canada)

Published in SPIE Proceedings Vol. 5922:
Hard X-Ray and Gamma-Ray Detector Physics VII
Ralph B. James; Larry A. Franks; Arnold Burger, Editor(s)

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