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DataRay Inc. - ISO 11146-Compliant Laser Beam Profilers
Photonics Dictionary

x-ray detector

One of various types of fluorescent screens used to detect x-ray radiation. Photographic film is mildly sensitive to x-rays, but much more sensitive to light. Hence, in photographing x-ray shadowgraphs, it is common practice to compress the film between two fluorescent screens and so have the advantage of the film's natural sensitivity.
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