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Applications of pixellated GaAs X-ray detectors in a synchrotron radiation beam

Watt, J and Bates, R and Campbell, M and Mathieson, K and Mikulec, B and O'Shea, V and Passmore, MS and Schwarz, C and Smith, KM and Whitehill, C (2001) Applications of pixellated GaAs X-ray detectors in a synchrotron radiation beam. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 460 (1). pp. 185-190. ISSN 0168-9002

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Abstract

Hybrid semiconductor pixel detectors are being investigated as imaging devices for radiography and synchrotron radiation beam applications. Based on previous work in the CERN RD19 and the UK IMPACT collaborations, a photon counting GaAs pixel detector (PCD) has been used in an X-ray powder diffraction experiment. The device consists of a 200 μm thick SI-LEC GaAs detector patterned in a 64×64 array of 170 μm pitch square pixels, bump-bonded to readout electronics operating in single photon counting mode. Intensity peaks in the powder diffraction pattern of KNbO3 have been resolved and compared with results using the standard scintillator, and a PCD predecessor (the Ω3). The PCD shows improved speed, dynamic range, 2-D information and comparable spatial resolution to the standard scintillator based systems. It also overcomes the severe dead time limitations of the Ω3 by using a shutter based acquisition mode. A brief demonstration of the possibilities of the system for dental radiography and image processing are given, showing a marked reduction in patient dose and dead time compared with film.

Item type: Article
ID code: 37555
Notes: 1st International Workshop on Radiation Imaging Detectors, SUNDSVALL, SWEDEN, JUN 13-17, 1999
Keywords: GaAs X-ray detectors , synchrotron radiation beam , X-ray detectors , Optics. Light, Instrumentation, Nuclear and High Energy Physics
Subjects: Science > Physics > Optics. Light
Department: Faculty of Science > Institute of Photonics
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 09 Feb 2012 16:38
    Last modified: 05 Sep 2014 15:02
    URI: http://strathprints.strath.ac.uk/id/eprint/37555

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