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Proceedings Paper

Multipixel characterization of imaging CZT detectors for hard x-ray imaging and spectroscopy
Author(s): Santosh V. Vadawale; Jae Sub Hong; Jonathan E. Grindlay; Peter Williams; Minhua Zhang; Eric C. Bellm; Tomohiko Narita; William W. Craig; Bradford H. Parker; Carl M. Stahle; Feng Yan
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Paper Abstract

We report our in-depth study of Cd-Zn-Te (CZT) crystals to determine an optimum pixel and guard band configuration for Hard X-ray imaging and spectroscopy. We tested 20x20x5mm crystals with 8x8 pixels on a 2.46mm pitch. We have studied different types of cathode / anode contacts and different pixel pad sizes. We present the measurements of leakage current as well as spectral response for each pixel. Our I-V measurement setup is custom designed to allow automated measurements of the I-V curves sequentially for all 64 pixels, whereas the radiation properties measurement setup allows for interchangeable crystals with the same XAIM3.2 ASIC readout from IDEAS. We have tested multiple crystals of each type, and each crystal in different positions to measure the variation between individual crystals and variation among the ASIC channels. We also compare the same crystals with and without a grounded guard band deposited on the crystal side walls vs. a floating guard band and compare results to simulations. This study was carried out to find the optimum CZT crystal configuration for prototype detectors for the proposed Black-Hole Finder mission, EXIST.

Paper Details

Date Published: 21 October 2004
PDF: 11 pages
Proc. SPIE 5540, Hard X-Ray and Gamma-Ray Detector Physics VI, (21 October 2004); doi: 10.1117/12.559748
Show Author Affiliations
Santosh V. Vadawale, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Jae Sub Hong, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Jonathan E. Grindlay, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Peter Williams, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Minhua Zhang, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Eric C. Bellm, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Tomohiko Narita, College of the Holy Cross (United States)
William W. Craig, Lawrence Livermore National Lab. (United States)
Bradford H. Parker, NASA Goddard Space Flight Ctr. (United States)
Carl M. Stahle, NASA Goddard Space Flight Ctr. (United States)
Feng Yan, NASA Goddard Space Flight Ctr. (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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