title: Spectroscopic Performance of Thick HgI2Detectors.
abstract: This paper presents the spectroscopic performance of two newly developed pixelated HgI2detectors. These detectors are 1 × 1 × 0.814 cm3and 1 × 1 × 1.016 cm3in size. Each detector has four closely packed 1 × mm2anode pixels at the center of one of the 1 × 1 cm2surfaces. These anode pixels are surrounded by a large anode. All results presented here are based on events from a sub-volume underneath the anode pixels. In these detectors, signals were read out by a discrete electronics based on multiple A-250 pre-amplifiers and a digital oscilloscope for sampling pulse waveforms. Depth sensing technique was used to correct the depth-dependent variation in photopeak amplitude. Main results presented are: (1) energy resolutions of 0.85 ~ 1.3% have been achieved on these detectors; (2) the electron mobility-lifetime product was measured to be ~1 × 10-2cm2/V and the measured electron lifetime was ~200μs and (3) variation in electron drifting properties under different anode pixels were observed. Significant non-uniformity in internal electric field strength was also experimentally demonstrated.
authors.affiliation: Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109 USA.
authors.forename: L J
authors.initials: LJ
authors.lastname: Meng
authors.affiliation: Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109 USA.
authors.forename: Z
authors.initials: Z
authors.lastname: He
authors.affiliation: Constellation Technology Corporation, Largo, FL 33777 USA.
authors.forename: B
authors.initials: B
authors.lastname: Alexander
authors.affiliation: Constellation Technology Corporation, Largo, FL 33777 USA.
authors.forename: J
authors.initials: J
authors.lastname: Sandoval
keywords: HgI2; Spectroscopic Performance