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AC 43.13-1B 9/8/98 FIGURE 5-14. Radiography. projection. The CT image is comparable to that obtained by making a radiograph of a physically sectioned thin planar slab from an object. This cross-sectional image is not ob- scured by overlying and underlying structures and is highly sensitive to small differences in relative density. Computed tomography im- ages are also easier to interpret than radio- graphs. 5-79. USES OF RADIOGRAPHY. Radi- ography is used to detect the features of a component or assembly that exhibit a differ- ence in thickness or density as compared to surrounding material. Large differences are more easily detected than small ones. In gen- eral, radiography can detect only those features that have an appreciable thickness in a direc- tion along the axis of the radiation beam. Therefore, the ability of radiography to detect planar discontinuities, such as cracks, depends on proper orientation of the test piece during inspection. Discontinuities which have measurable thickness in all directions, such as voids and inclusions, can be detected as long as they are not too small in relation to section thickness. In general, features that exhibit a 2 percent or more difference in radiation ad- sorption compared to the surrounding material can be detected. 5-80. COMPARISON WITH OTHER NDI METHODS. Radiography and ultra- sonic are the two generally-used, nondestruc- tive inspection methods that can satisfactorily detect flaws that are completely internal and located well below the surface of the test part. Neither method is limited to the detection of specific types of internal flaws. However, ra- diography is more effective when the flaws are not planar, while ultrasonic is more effective when flaws are planar. In comparison to other generally-used NDI methods (e.g., magnetic particle, liquid penetrant, and eddy current in- spection), radiography has the following ad- vantages. Page 5-38 Par 5-78PDF Image | AFS-640
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