Testing of gadolinium oxy-sulphide phosphors for use in CCD-based X-ray detectors for macromolecular crystallography

Pokric, Maja and Allinson, Nigel (2002) Testing of gadolinium oxy-sulphide phosphors for use in CCD-based X-ray detectors for macromolecular crystallography. In: 5th International Conference on Position-Sensitive Detectors PSD-5 1999, 13-17 September 1999, London.

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Item Type:Conference or Workshop contribution (Paper)
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Abstract

The resolution and detective quantum efficiency of CCD-based detectors used for X-ray diffraction is primarily affected by the layer of phosphor that converts incident X-ray photons into visible photons. The optimum thickness of this phosphor layer is strongly dependent on the fraction of absorbed incident X-ray photons and required spatial resolution. A range of terbium doped gadolinium oxy-sulphide (Gd2O2S:Tb) phosphor samples, provided by Applied Scintillation Technologies, have been evaluated for spatial resolution, light output and uniformity. The phosphor samples varied in coating weight (10-25 mg/cm2), grain size (2.5, 4, 10 μm), and applied coating (no coating, reflectors and absorbers). In addition, a non-uniform layer was introduced to some samples in order to provide an inherent diffusion layer. The experimental results showed that the introduction of a reflector increases the point spread function (PSF) and increases light yield up to 30%, while an absorber reduces the PSF tails and decreases the light yield up to 35%. The PSF linearly increases with thickness, while the greatest light yield was obtained with phosphor samples of 4 μm particle size. © 2002 Elsevier Science B.V. All rights reserved.

Keywords:Charge coupled devices, Crystallography, Gadolinium, Grain size and shape, Optical transfer function, Phosphors, Photons, Quantum efficiency, X ray analysis, Macromolecular crystallography, Radiation detectors
Subjects:F Physical Sciences > F131 Crystallography
G Mathematical and Computer Sciences > G400 Computer Science
Divisions:College of Science > School of Computer Science
ID Code:8574
Deposited On:26 Apr 2013 10:04

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