Options
2011
Book Article
Titel
Nondestructive Testing, 2. Radiography
Abstract
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.