Analysis of detector response using 3-D position sensitive CZT gamma-ray spectrometers

Author

Zhang, Feng ; He, Zhong ; Xu, Dan

Author_Institution

Dept. of Nucl. Eng. & Radiol. Sci., Michigan Univ., Ann Arbor, MI, USA

Volume

5

fYear

2003

fDate

19-25 Oct. 2003

Firstpage

3493

Abstract

Two 2.25 cm³ CdZnTe gamma-ray spectrometers with 3-D position sensitivity were constructed and tested. By using 11 by 11 pixellated anodes and depth sensing technique, individual spectral data for each of over 2000 voxels were collected throughout the detector volume. Energy resolution of 1.11% FWHM, 1.57% FWHM and 2.13% FWHM at 662 keV were obtained for one, two and three-pixel events respectively from the 120 working pixels of one detector. Spatial variation of electron mobility and lift time product, energy resolution, photopeak efficiency and total efficiency have been observed and analyzed. This analysis provides a direct observation on the uniformity of detector response (due to material and electric field distribution) in 3-dimension. The impact of the spatial variation of detector response on a CZT gamma-ray spectrometer will be discussed.

Keywords

cadmium compounds; electron mobility; gamma-ray detection; gamma-ray spectrometers; position sensitive particle detectors; semiconductor counters; 11 pixel; 120 pixel; 3-D position sensitive CZT gamma-ray spectrometers; 3-D position sensitivity; 662 keV; CdZnTe gamma-ray spectrometers; depth sensing technique; detector response; detector volume; electron mobility; energy resolution; individual spectral data; lift time product; one-pixel event; photopeak efficiency; pixellated anodes; spatial variation; three-pixel event; two-pixel event; Anodes; Cathodes; Electron traps; Energy resolution; Gamma ray detection; Gamma ray detectors; Helium; Position sensitive particle detectors; Spectroscopy; Telephony;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record, 2003 IEEE

ISSN

1082-3654

Print_ISBN

0-7803-8257-9

Type

conf

DOI

10.1109/NSSMIC.2003.1352664

Filename

1352664