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CZT Solid State Detectors and Applications

Alexander Cherlin

Kromek Group plc, Sedgefield, UK

Abstract:CZT is a room temperature semiconductor that directly converts x-ray or gamma-ray photons into electrons. CZT is a unique semiconductor compared with Silicon and Germanium detectors, in that CZT operates at room temperature, can process high fluxes of millions of photons per second per mm2, and offers substantially higher detection efficiency in the energy region above ~20 keV. Additionally, CZT's spectroscopic resolution clearly out performs any commercially available Scintillator material. The unique combination of spectroscopy and high-count rate capability at room temperature makes CZT an ideal detector solution for Medical, Industrial, Homeland Security and Laboratory applications. The maturity of the CZT growth process and detector production combined with a proprietary stud bonding hybridisation technique allows Kromek manufacturing detectors for a broad range of applications ranging from medical imaging and space sciences to industrial quality control and material studies at synchrotrons.In my presentation, I shall review the basics of the CZT crystal growth, its challenges, and present applications of our CZT detector technology in a number of radiation detection developments and products. As a part of our technology portfolio, Kromek is engaged in the development of applications based on the ASICs from the CERN Medipix family. I shall present some of the results from the simulation and development of 5 mm thick CZT sensors with 110 µm pixel pitch bonded to a Timepix ASIC. The detector characterisation was performed using a variety of gamma-ray and x-ray sources. The experimental results are compared to the detector simulations which were developed at Kromek by combining GEANT4 to simulate physics interactions, COMSOL Multiphysics to simulate charge induction efficiency and additional analysis code which produces the induced charge in the detector pixels and performs event reconstruction via pixel clustering.

Seminar takes place on Tuesday, February 27th 2018 at 3:00 PM
in the IEAP meeting room, Praha 2 ‐ Albertov, Horská 3a/22.

doc. Dr. André Sopczak
seminar organizer
doc. Ing. Ivan Štekl, CSc.
director of IEAP
doc. Dr. André Sopczak
IEEE CS - NPSS chair

IEEE logoNUCLEAR & PLASMA SCIENCES SOCIETY CHAPTER
IEEE Czechoslovakia section
http://www.ieee.cz/en/nps

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