Development of new CdZnTe detectors for room-temperature high-flux radiation measurements
Recently, CdZnTe (CZT) detectors have been widely proposed and developed for room-temperature X-ray spectroscopy even at high fluxes, and great efforts have been made on both the device and the crystal growth technologies. In this work, the performance of new travelling-heater-method (THM)-grown CZT detectors, recently developed at IMEM-CNR Parma, Italy, is presented. Thick planar detectors (3 mm thick) with gold electroless contacts were realised, with a planar cathode covering the detector surface (4.1 mm × 4.1 mm) and a central anode (2 mm × 2 mm) surrounded by a guard-ring electrode. The detectors, characterized by low leakage currents at room temperature (4.7 nA cm − 2 at 1000 V cm − 1), allow good room-temperature operation even at high bias voltages (>7000 V cm − 1). At low rates (200 counts s − 1), the detectors exhibit an energy resolution around 4% FWHM at 59.5 keV (241Am source) up to 2200 V, by using commercial front-end electronics (A250F/NF charge-sensitive preamplifier, Amptek, USA; nominal equivalent noise charge of 100 electrons RMS). At high rates (1 Mcounts s − 1), the detectors, coupled to a custom-designed digital pulse processing electronics developed at DiFC of University of Palermo (Italy), show low spectroscopic degradations: energy resolution values of 8% and 9.7% FWHM at 59.5 keV (241Am source) were measured, with throughputs of 0.4% and 60% at 1 Mcounts ...
Source: Journal of Synchrotron Radiation - Category: Physics Authors: Abbene, L. Gerardi, G. Raso, G. Principato, F. Zambelli, N. Benassi, G. Bettelli, M. Zappettini, A. Tags: X-ray and γ -ray detectors CdZnTe detectors travelling heater method gold electroless contact high flux digital pulse shape analysis energy-resolved photon-counting detectors research papers Source Type: research
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