Electron trapping variations in single-crystal pixelated HgI/sub 2/ gamma-ray spectrometers

The characteristics of thick (/spl sim/6 mm) HgI/sub 2/ 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 HgI/sub 2/ crystal. By using the single polarity charge sensing with depth sensing, the /spl mu//sub e//spl tau//sub e/ was estimated to vary from /spl sim/9/spl times/10/sup -4/ cm/sup 2//V to 7/spl times/10/sup -3/ cm/sup 2//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.