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Nondestructive Testing, 2. Radiography

: Maisl, Michael

Ullmann's Encyclopedia of Industrial Chemistry. 7th Edition
Weinheim: Wiley-VCH, 2011
ISBN: 978-3-527-32943-4
ISBN: 9783527306732
18 S.
Aufsatz in Buch
Fraunhofer IZFP ()
imaging; radiation; computed tomography

Radiography utilizes the differential attenuation of penetrating radiation to find internal flaws such as porosity and compositional changes, as well as variations in thickness and cracks. X-rays, gamma rays, and neutrons are used and are imaged by photographic films, fluoroscopic screens, and more recently, electronic imaging devices. Thickness changes of 1-2% and flaw sizes of a few tenths of a millimeter can typically be detected. This method examines a large volume of material simultaneously, and most welds are radiographed routinely. However, radiation safety measures must be rigorously enforced.