Properties of CdZnTe detectors in the Burst Alert Telescope (BAT) array

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

doi:10.1117/12.506460

20 January 2004 Properties of CdZnTe detectors in the Burst Alert Telescope (BAT) array

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

Author Affiliations +

Proceedings Volume 5198, Hard X-Ray and Gamma-Ray Detector Physics V; (2004) https://doi.org/10.1117/12.506460
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

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.

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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, and Dave Willis "Properties of CdZnTe detectors in the Burst Alert Telescope (BAT) array", Proc. SPIE 5198, Hard X-Ray and Gamma-Ray Detector Physics V, (20 January 2004); https://doi.org/10.1117/12.506460

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