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Microradiography as a Strong NDT Tool
Figure 1-4
Figure 1 - An early attempt to make magnified radiographs.
Figure 2 - Radiograph of an electronic part taken with a conventional X-ray tube: (a) with no magnification; (b) printed magnified on photographic paper and showing fine porosity in the joints.
Figure 3 - Relation between geometric unsharpness and source size: (a) conventional radiography with large focal size, providing an enlarged image with large geometric unsharpness (Ug 1); (b) conventional radiography with large focal size, providing a sharp image with small geometric unsharpness (Ug 2); (c) microradiography, providing enlarged image with small geometric unsharpness (Ug 3); SOD = source to object distance, SFD = source to film distance.
Figure 4 - The relation between focal spot size and geometric unsharpness for different projection magnifications.
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