Title :
Improved resolution for 3-D position sensitive CdZnTe spectrometers
Author :
Zhang, Feng ; He, Zhong ; Xu, Dan ; Knoll, Glenn F. ; Wehe, David K. ; Berry, J.E.
Author_Institution :
Dept. of Nucl. Eng. & Radiol. Sci., Univ. of Michigan, Ann Arbor, MI, USA
Abstract :
Two three-dimensional position sensitive CdZnTe gamma-ray spectrometers based on VAS2/TAT2 ASICs were constructed and fully tested. Each 1.5×1.5×1 cm3 CdZnTe detector employs 11×11 pixelated anodes. Each pixel location provides the interaction´s lateral coordinates, while the cathode/anode signal ratio and the electron drift time are both used to obtain the interaction depth. Data-acquisition and processing software were developed to perform calibration and real-time spectroscopy. An energy resolution of 1.11% full-width at half-maximum (FWHM) at 662 keV was obtained for single-pixel events from the 120 working pixels of one detector, and an energy resolution of 1.14% FWHM was obtained on the other detector. Significant progress in improving energy resolution for multiple pixel events has been realized. The energy resolutions at 662 keV for two-pixel events and three-pixel events were 1.57% FWHM and 2.13% FWHM, respectively.
Keywords :
application specific integrated circuits; calibration; data acquisition; gamma-ray detection; gamma-ray spectrometers; high energy physics instrumentation computing; nuclear electronics; position sensitive particle detectors; real-time systems; semiconductor counters; 1 cm; 1.5 cm; 11 pixel; 121 pixel; FWHM; VAS2/TAT2 ASICs; calibration; cathode/anode signal ratio; data-acquisition; electron drift time; energy resolution; full-width at half-maximum; interaction depth; interaction lateral coordinates; multiple pixel events; pixel location; pixelated anodes; processing software; real-time spectroscopy; single-pixel events; three-dimensional position sensitive CdZnTe gamma-ray spectrometer; three-pixel events; two-pixel events; working pixels; Anodes; Calibration; Cathodes; Detectors; Electrons; Energy resolution; Event detection; Software performance; Spectroscopy; Testing; -D; CZT; CdZnTe; gamma-ray spectroscopy; position sensitive; spectrometer; three-dimensional;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.2004.835635
