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Proceedings Paper

Development of CZT detectors for x-ray and gamma-ray astronomy
Author(s): Kuen Lee; J. W. Martin; A. Garson; Q. Guo; J. Matteson; M. Groza; M. Beilicke; A. Burger; G. de Geronimo; H. Krawczynski
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Paper Abstract

Cadmium Zinc Telluride (CZT) is the detector material of choice for the detection of X-rays in the 10 keV-1MeV energy band with excellent spatial and energy resolutions and without cryogenic cooling. In this contribution, we report on recent results of the CZT detector development program and several astrophysical experiments which make use of CZT detectors. In the first part of the paper, we discuss the performance of pixel and cross-strip CZT detectors read out with an ASIC developed at the Brookhaven National Laboratory. Our pixel detectors achieve some of the best energy resolutions reported in the literature. Cross-strip detectors are found to give an inferior performance and we investigate the reason for this performance difference. We also present results from a precision measurement of the effect of a steering grid on multi-pixel events obtained with a 200 micrometer collimator. In the second part of the paper, we describe the design and performance of the hard X-ray polarimeter X-Calibur. The polarimeter uses a 14 cm long scintillator scatterer, surrounded by an assembly of 32 2-5 mm thick CZT detectors. We discuss the sensitivity of the polarimeter to measure the linear polarization of 10 keV-80 keV X-rays on short and long balloon flights and results from testing the polarimeter in the laboratory.

Paper Details

Date Published: 27 September 2011
PDF: 10 pages
Proc. SPIE 8142, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIII, 81420D (27 September 2011); doi: 10.1117/12.893595
Show Author Affiliations
Kuen Lee, Washington Univ. in St. Louis (United States)
J. W. Martin, Washington Univ. in St. Louis (United States)
A. Garson, Washington Univ. in St. Louis (United States)
Q. Guo, Washington Univ. in St. Louis (United States)
J. Matteson, Univ. of California, San Diego (United States)
M. Groza, Fisk Univ. (United States)
M. Beilicke, Washington Univ. in St. Louis (United States)
A. Burger, Fisk Univ. (United States)
G. de Geronimo, Brookhaven National Lab. (United States)
H. Krawczynski, Washington Univ. in St. Louis (United States)

Published in SPIE Proceedings Vol. 8142:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIII
Larry A. Franks; Ralph B. James; Arnold Burger, Editor(s)

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