Abstract: Nondestructive testing technology has gone through three stages of development, nondestructive inspection, nondestructive testing and nondestructive evaluation. At present, NDT is generally referred to the nondestructive technology collectively, rather than referring specifically to the second stage mentioned above. Non-destructive testing technology plays an irreplaceable role in product quality control, and a wide range of applications developed in the manufacturing and inspection of aerospace equipment, as well as applied in the manufacturing and welding of pressure equipment. As one of the "black technology" in aerospace technology, a series of industrial non-destructive flaw detection X-ray films, with cube and T-particle silver halide, produced by Lucky Healthcare Corporation, a subsidiary of China Aerospace Technology Co. Ltd., has been serving for many years in traditional x-ray detection as same as the several other famous multinational photosensitive 46 materials enterprises. This paper introduces the development of NDT technology, testing methods, and its application in aerospace and railway bridges.

Key words: nondestructive testing, NDT, NDT X-ray film