Spatial variation of energy resolution in 3-D position sensitive CZT Gamma-Ray spectrometers

Author

Li, W. ; He, Z. ; Knoll, G.F. ; Wehe, D.K. ; Stahle, C.M.

Author_Institution

Dept. of Nucl. Eng. & Radiological Scis., Michigan Univ., Ann Arbor, MI, USA

Volume

1

fYear

1998

fDate

1998

Firstpage

628

Abstract

This paper reports the energy resolutions obtained from two 3-D CZT γ-ray spectrometers. Each device is a 1 cm³ cube CZT crystal with an 11×11 pixellated anode. For single-interaction events in the detector, the gamma ray interaction location can be determined in 3-D. With the volume of each detector conceptually divided into 11×11×18 voxels, the spectra of single-interaction events from each of the voxels were collected. The energy resolutions at 662 keV from a single voxel are typically 9.3 keV and 9.9 keV for the two detectors, with electronic noise contributing ~7 keV and ~6 keV respectively a spatially-varying energy resolution has been observed for both detectors, which accounts for the degradation of energy resolution of the overall spectrum combined from all the voxels. The causes for the variations have been analyzed, and the impact of a spatially-varying energy resolution on a CZT gamma-ray spectrometer has been investigated

Keywords

gamma-ray spectrometers; semiconductor counters; 662 keV; CZT γ-ray spectrometers; CdZnTe; electronic noise; energy resolution; position sensitive; single-interaction events; Aerospace engineering; Anodes; Cathodes; Degradation; Detectors; Electron traps; Energy resolution; Event detection; Signal processing; Spectroscopy;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium, 1998. Conference Record. 1998 IEEE

Conference_Location

Toronto, Ont.

ISSN

1082-3654

Print_ISBN

0-7803-5021-9

Type

conf

DOI

10.1109/NSSMIC.1998.775218

Filename

775218