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Proceedings Paper

Properties of CdZnTe detectors in the Burst Alert Telescope (BAT) array
Author(s): Goro Sato; Tadayuki Takahashi; Kazuhiro Nakazawa; Shin Watanabe; Makoto Tashiro; Masaya Suzuki; Yu Okada; Hiromitsu Takahashi; Ann M. Parsons; Jack Tueller; Hans Krimm; Scott D. Barthelmy; Jay Cummings; Craig Markwardt; Derek D. Hullinger; Neil A. Gehrels; Edward E. Fenimore; David Palmer; Anthony J. Dean; Dave Willis
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Paper Abstract

The properties of 32k CdZnTe detectors have been studied in the pre-flight calibration of Burst Alert Telescope (BAT) on-board the Swift Gamma-ray Burst Explorer (scheduled for launch in January 2004). After corrections of the linearity and the gain, the energy resolution of summed spectrum is 7.0 keV (FWHM) at 122~keV. In order to construct response matrices for the BAT instrument, we extracted mobility-lifetime (μτ) products for electrons and holes in the CdZnTe. Based on a new method applied to 57Co spectra taken at different bias voltages, μτ for electrons ranges from 5.0x10-4 to 1.0x10-2cm2V-1, while μτ for holes ranges from 1.0x10-5 to 1.7x10-4cm2V-1. We show that the distortion of the spectrum and the peak efficiency of the BAT instrument are well reproduced by the μτ database constructed in the calibration.

Paper Details

Date Published: 20 January 2004
PDF: 8 pages
Proc. SPIE 5198, Hard X-Ray and Gamma-Ray Detector Physics V, (20 January 2004); doi: 10.1117/12.506460
Show Author Affiliations
Goro Sato, Institute of Space and Astronautical Science (Japan)
Univ. of Tokyo (Japan)
NASA Goddard Space Flight Center (United States)
Tadayuki Takahashi, Institute of Space and Astronautical Science (Japan)
Kazuhiro Nakazawa, Institute of Space and Astronautical Science (Japan)
Shin Watanabe, Institute of Space and Astronautical Science (Japan)
Univ. of Tokyo (Japan)
Makoto Tashiro, Univ. of Saitama (Japan)
Masaya Suzuki, Univ. of Saitama (Japan)
Yu Okada, Univ. of Tokyo (Japan)
Hiromitsu Takahashi, Univ. of Tokyo (Japan)
Ann M. Parsons, NASA Goddard Space Flight Ctr. (United States)
Jack Tueller, NASA Goddard Space Flight Ctr. (United States)
Hans Krimm, NASA Goddard Space Flight Ctr. (United States)
Universities Space Research Assoc. (United States)
Scott D. Barthelmy, NASA Goddard Space Flight Ctr. (United States)
Jay Cummings, NASA Goddard Space Flight Ctr. (United States)
Universtities Space Research Assoc. (United States)
Craig Markwardt, NASA Goddard Space Flight Ctr. (United States)
Univ. of Malyland/College Park (United States)
Derek D. Hullinger, NASA Goddard Space Flight Ctr. (United States)
Univ. of Maryland/College Park (United States)
Neil A. Gehrels, NASA Goddard Space Flight Ctr. (United States)
Edward E. Fenimore, Los Alamos National Lab. (United States)
David Palmer, Los Alamos National Lab. (United States)
Anthony J. Dean, Univ. of Southampton (United Kingdom)
Dave Willis, Univ. of Southampton (United Kingdom)


Published in SPIE Proceedings Vol. 5198:
Hard X-Ray and Gamma-Ray Detector Physics V
Larry A. Franks; Arnold Burger; Ralph B. James; Paul L. Hink, Editor(s)

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