Images of single X-ray photons from X-ray phosphor screens

Astronomy and Astrophysics – Astronomy

Scientific paper

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Image Intensifiers, Imaging Techniques, Phosphors, Photons, X Ray Imagery, Photoelectric Emission, Radiography, Signal To Noise Ratios, X Ray Astronomy, X Ray Diffraction

Scientific paper

Photographs show the efficiency and resolution characteristics of single X-ray photons converted to optical photons in a variety of commercial X-ray phosphor screens. The recording system uses a cooled, two-stage image intensifier system with fiber optics coupling to the phosphor screen. High efficiencies in the energy range 20-100 keV with position resolution of the order 200 microns are readily achievable, although the sensitive area is presently limited. Potential applications include X-ray astronomy, high-speed X-ray diffractometry, and extremely low dose radiography.

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