Properties of CdZnTe detectors in the Burst Alert Telescope (BAT) array
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説明
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 57 Co spectra taken at different bias voltages, μτ for electrons ranges from 5.0x10 -4 to 1.0x10 -2 cm 2 V -1 , while μτ for holes ranges from 1.0x10 -5 to 1.7x10 -4 cm 2 V -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.
収録刊行物
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- SPIE Proceedings
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SPIE Proceedings 5198 209-, 2004-01-20
SPIE
