6533b871fe1ef96bd12d1084
RESEARCH PRODUCT
Room-temperature performance of 3 mm-thick cadmium-zinc-telluride pixel detectors with sub-millimetre pixelization.
Matthew C. VealeManuele BettelliAndrea ZappettiniO J L FoxGaetano GerardiPaul SellerFabio PrincipatoKawal SawhneyLeonardo AbbeneAntonino ButtacavoliNicola Sarzi Amadèsubject
Nuclear and High Energy PhysicsMaterials sciencePhysics::Instrumentation and DetectorsAstrophysics::High Energy Astrophysical Phenomena02 engineering and technology01 natural sciencesDot pitchCollimated lightlaw.inventionCharge sharingchemistry.chemical_compoundOpticslaw0103 physical sciencesInstrumentation010302 applied physicsX-ray and gamma ray detectors; CdZnTe pixel detectors; charge sharing; charge losses; charge-sharing correction; spectroscopic X-ray imagingRadiationPixelbusiness.industrySettore FIS/01 - Fisica SperimentaleDetectorCdZnTe pixel detectors charge losses charge sharing charge-sharing correction spectroscopic X-ray imaging X-ray and gamma ray detectors021001 nanoscience & nanotechnologySettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)SynchrotronCadmium zinc telluridechemistry0210 nano-technologyPixelizationbusinessdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-01-01 | Journal of synchrotron radiation |