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Radiography is the general term given to material inspection methods that are based on the differential absorption of penetrating radiation - either electromagnetic radiation of very short wavelength or particulate radiation - by the part or testpiece (object) being inspected. Because of differences in density and variations in thickness of the part or differences in absorption characteristics caused by variations in composition, different portions of a testpiece absorb different amounts of penetrating radiation. These variations in the absorption of the penetrating radiation can be monitored by detecting the unabsorbed radiation that passes through the testpiece.

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