Development of new CdZnTe detectors for room-temperature high-flux radiation measurements

Gaetano Gerardi, Giuseppe Raso, Fabio Principato, Leonardo Abbene, Giacomo Benassi, Manuele Bettelli, Andrea Zappettini, Nicola Zambelli

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10 Citazioni (Scopus)

Abstract

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 cm2 at 1000 V cm1), allow good room-temperature operation even at high bias voltages (>7000 V cm1). At low rates (200 counts s1), 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 s1), the detectors, coupled to a customdesigned 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 s1, respectively. An energy resolution of 7.7% FWHM at 122.1 keV (57Co source) with a throughput of 50% was obtained at 550 kcounts s1 (energy resolution of 3.2% at low rate). These activities are in the framework of an Italian research project on the development of energy-resolved photon-counting systems for high-flux energy-resolved X-ray imaging.
Lingua originaleEnglish
pagine (da-a)429-438
Numero di pagine10
RivistaJournal of Synchrotron Radiation
Volume24
Stato di pubblicazionePublished - 2017

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All Science Journal Classification (ASJC) codes

  • Radiation
  • Nuclear and High Energy Physics
  • Instrumentation

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