Backscatter RadiographyNon-Destructive Inspection
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Radiography by selective detection (RSD) allows for preferential detection of backscatter components that are responsible for improving image contrast. This is accomplished through a set of specially designed detectors and both fixed and movable detector collimators. An example of RSD is lateral migration radiography (LMR). The LMR approach is based on image contrast generated by the lateral migration of scattered x-rays in directions perpendicular to the radiation illumination beam. This technique has been used successfully to detect buried landmines and flaws and defects in aluminum, plastics, honeycomb laminates, reinforced carbon composites, steel, and titanium. LMR has been used to detect variations in composition, including corrosion, and to detect flaws as small as 50 microns in height, 1 mm in width and 1 cm long in samples of actual aircraft components.