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Electron trapping variations in single-crystal pixelated HgI2 gamma-ray spectrometers

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3 Author(s)
Baciak, J.E. ; Dept. of Nucl. Eng. & Radiol. Sci., Michigan Univ., Ann Arbor, MI, USA ; He, Z. ; DeVito, R.P.

The characteristics of thick (∼6 mm) HgI2 room-temperature gamma-ray detectors having 4 small pixel anodes are investigated. Spectra for the different anodes (overall and for individual interaction depths) are presented. The mu-tau product for electrons was measured to study the variations of electron transport within a single HgI2 crystal. By using the single polarity charge sensing with depth sensing, the μeτe was estimated to vary from ∼9×10-4 cm2/V to 7×10-3 cm2/V. Individual pixels have the ability to produce spectra with resolutions less than 3% at 662 keV. Some effects of electron detrapping and hole transport are also discussed.

Published in:

Nuclear Science, IEEE Transactions on  (Volume:49 ,  Issue: 3 )

Date of Publication:

Jun 2002

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