High spatial resolution scintillator screens coupled to CCD detectors for X-ray imaging applications

Castelli, C. M. and Allinson, N. M. and Moon, K. J. and Watson, D. L. (1994) High spatial resolution scintillator screens coupled to CCD detectors for X-ray imaging applications. Nuclear Instruments and Methods in Physics Research: A, 348 (2-3). pp. 649-653. ISSN 0168-9002

Full content URL: http://dx.doi.org/10.1016/0168-9002(94)90817-6

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Item Type:Article
Item Status:Live Archive

Abstract

New generations of X-ray imaging detectors are being developed for X-ray diffraction studies using both conventional sources and synchrotron beam lines. In many cases, these detectors utilise a scintillator screen to convert the X-ray photon energy into scintillation light. However, the spatial resolution is limited due to the diffusion of light that occurs within the scintillator layer. Results are presented for a scintillation screen that improves the spatial resolution through the use of a specially prepared fibre optic surface where the clad glass has been selectively etched away to leave the protruding columns of core glass. When evaporated onto this surface, the scintillator grows as extensions of these pillars forming discrete columns which individually act as light guides for the scintillation light. A calculation of the system DQE is presented and used to predict the performance to 8 keV X-rays. A Monte Carlo simulation of the X-ray interaction in CsI is also used to evaluate the system DQE above the K shell absorption edges (33 and 37 keV) and therefore determine the useful energy range of the scintillator. © 1994.

Additional Information:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Keywords:Charge coupled devices, Electromagnetic wave diffraction, Fiber optics, Imaging techniques, Light, Mathematical models, Monte Carlo methods, Phosphors, Photons, Synchrotron radiation, X ray analysis, X rays, High spatial resolution scintillator, Scintillation light, Synchrotron beam lines, X ray camera, X ray diffraction, X ray imaging detector, Radiation detectors
Subjects:F Physical Sciences > F350 Medical Physics
Divisions:College of Science > School of Computer Science
ID Code:8608
Deposited On:07 May 2013 10:31

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