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HEXITEC: A high-energy x-ray spectroscopic imaging detector for synchrotron applications

DOI: 10.1080/08940886.2018.1528431 DOI Help

Authors: M. C. Veale (UKRI Science & Technology Facilities Council) , P. Seller (UKRI Science & Technology Facilities Council) , M. Wilson (UKRI Science & Technology Facilities Council) , E. Liotti (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Synchrotron Radiation News , VOL 31 , PAGES 28 - 32

State: Published (Approved)
Published: November 2018

Abstract: Over the last decade, the High-Energy X-ray Imaging Technology (HEXITEC) detector system for spectroscopic imaging of hard X-rays and γ-rays has been developed by the Science & Technology Facilities Council (STFC). The system is based upon the room-temperature compound semiconductor cadmium telluride (CdTe) which, due to its high density and large band gap, allows the measurement of X-ray and γ-ray spectra up to energies of 200 keV with an energy resolution of <1 keV without the need for cryogenic cooling systems. The technology differs significantly from single photon counting detector systems, where a count is registered each time the output of a pixel is above a threshold. In the HEXITEC system, each 250 μm pixel is able to record the precise energy deposited by an interaction and, over multiple frames, compiles energy-resolved X-ray spectra on a per-pixel basis rather than a simple 2D image. The system has been used at synchrotrons in applications which wish to discern mechanical, structural, or chemical information from within thick samples or to determine the chemical composition of samples containing multiple high Z materials which, typically, have closely spaced K-line X-ray emissions. While originally developed for materials science applications, the system has been successfully used across a diverse range of fields, including pure science, solar physics, medical imaging, and security applications. This article will review the current status of the technology and the performance of the latest system, and demonstrate the use of the system on a synchrotron beamline.

Subject Areas: Technique Development, Physics

Instruments: I12-JEEP: Joint Engineering, Environmental and Processing

Other Facilities: ESRF

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