Abstract
The direct production of a visible image on a fluorescent screen, X-ray fluoroscopy, has been known and used since the early days of X-rays but now has few applications in industrial radiography. In fluoroscopy the X-radiation that is transmitted through the specimen falls on to a screen which fluoresces, that is, emits light within the visible part of the spectrum; a visible image is produced on the fluorescent screen due to differential absorption in the different thicknesses of the specimen. The thinner, less absorbent parts of the specimen are seen as brighter areas on the screen, so that the tonal range is reversed compared with a film radiograph seen on an illuminated film-viewing screen. Cavities are brighter, not darker. The potentialities of ‘real-time’ imaging, particularly in medical diagnostic radiology, and the ability to see moving images, have led to major developments, e.g. image intensifiers and CCTV-fluoroscopic systems.
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Halmshaw, R. (1995). Fluoroscopy, image intensifiers, television systems and tomography. In: Industrial Radiology. Non-Destructive Evaluation Series, vol 1. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0551-4_12
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DOI: https://doi.org/10.1007/978-94-011-0551-4_12
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