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Instruments / Technical Area	Publication Details	Published	Actions
B16-Test Beamline	Room-temperature performance of 3 mm-thick cadmium–zinc–telluride pixel detectors with sub-millimetre pixelization Antonino Buttacavoli , Fabio Principato , Gaetano Gerardi , Manuele Bettelli , Nicola Sarzi Amade , Andrea Zappettini , Paul Seller , Matthew C. Veale , Oliver Fox , Kawal Sawhney , Leonardo Abbene Journal Of Synchrotron Radiation 27 DOI: 10.1107/S1600577520008942 Diamond Proposal Number(s): [20545] Show Abstract ▼ Abstract: Cadmium–zinc–telluride (CZT) pixel detectors represent a consolidated choice for the development of room-temperature spectroscopic X-ray imagers, finding important applications in medical imaging, often as detection modules of a variety of new SPECT and CT systems. Detectors with 3–5 mm thicknesses are able to efficiently detect X-rays up to 140 keV giving reasonable room-temperature energy resolution. In this work, the room-temperature performance of 3 mm-thick CZT pixel detectors, recently developed at IMEM/CNR of Parma (Italy), is presented. Sub-millimetre detector arrays with pixel pitch less than 500 µm were fabricated. The detectors are characterized by good room-temperature performance even at high bias voltage operation (6000 V cm−1), with energy resolutions (FWHM) of 3% (1.8 keV) and 1.6% (2 keV) at 59.5 keV and 122.1 keV, respectively. Charge-sharing investigations were performed with both uncollimated and collimated synchrotron X-ray beams with particular attention to recovering the charge losses at the inter-pixel gap region. High rate measurements demonstrated the absence of high-flux radiation-induced polarization phenomena up to 25 × 106 photons mm−2 s−1.	Sep 2020
B16-Test Beamline Detectors	Room-temperature X-ray response of cadmium–zinc–telluride pixel detectors grown by the vertical Bridgman technique Leonardo Abbene , Fabio Principato , Gaetano Gerardi , Antonino Buttacavoli , Donato Cascio , Manuele Bettelli , Nicola Sarzi Amade , Paul Seller , Matthew C. Veale , Oliver Fox , Kawal Sawhney , Silvia Zanettini , Elio Tomarchio , Andrea Zappettini Journal Of Synchrotron Radiation 27 DOI: 10.1107/S1600577519015996 Diamond Proposal Number(s): [20545] Show Abstract ▼ Abstract: In this work, the spectroscopic performances of new cadmium–zinc–telluride (CZT) pixel detectors recently developed at IMEM-CNR of Parma (Italy) are presented. Sub-millimetre arrays with pixel pitch less than 500 µm, based on boron oxide encapsulated vertical Bridgman grown CZT crystals, were fabricated. Excellent room-temperature performance characterizes the detectors even at high-bias-voltage operation (9000 V cm−1), with energy resolutions (FWHM) of 4% (0.9 keV), 1.7% (1 keV) and 1.3% (1.6 keV) at 22.1, 59.5 and 122.1 keV, respectively. Charge-sharing investigations were performed with both uncollimated and collimated synchrotron X-ray beams with particular attention to the mitigation of the charge losses at the inter-pixel gap region. High-rate measurements demonstrated the absence of high-flux radiation-induced polarization phenomena up to 2 × 106 photons mm−2 s−1. These activities are in the framework of an international collaboration on the development of energy-resolved photon-counting systems for high-flux energy-resolved X-ray imaging.	Mar 2020

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