Room-temperature performance of 3 mm-thick cadmium–zinc–telluride pixel detectors with sub-millimetre pixelization

DOI: 10.1107/S1600577520008942

Authors: Antonino Buttacavoli (University of Palermo) , Fabio Principato (University of Palermo) , Gaetano Gerardi (University of Palermo) , Manuele Bettelli (IMEM/CNR) , Nicola Sarzi Amade (IMEM/CNR) , Andrea Zappettini (IMEM/CNR) , Paul Seller (Science and Technology Facilities Council) , Matthew C. Veale (Science and Technology Facilities Council) , Oliver Fox (Diamond Light Source) , Kawal Sawhney (Diamond Light Source) , Leonardo Abbene (University of Palermo)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Synchrotron Radiation , VOL 27

State: Published (Approved)
Published: September 2020
Diamond Proposal Number(s): 20545

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.

Journal Keywords: X-ray and gamma ray detectors; CdZnTe pixel detectors; charge sharing; charge losses; charge-sharing correction; spectroscopic X-ray imaging.

Subject Areas: Physics


Instruments: B16-Test Beamline

Added On: 24/08/2020 11:34

Documents:
ve5123.pdf

Discipline Tags:

Detectors Physics Engineering & Technology

Technical Tags:

Diffraction