9/16/2023 0 Comments Ndt of missile![]() ![]() ![]() (4) A flexible system which can be more » easily maneuvered within the confines of a radiation cell. (3) An intense x-ray output so that exposure time may be relatively short. (2) A source size of small dimensions to insure good resolution. The main requirements for high energy radiographic inspection of large solid propellant missiles include: (1) Suitable choice of radiation energy to provide a compromise between minimum absorption, useful field cone size, and film unsharpness. The missile industry's increasing demand for extreme sensitivity of flaw detection on a production basis required a new type of x-ray equipment with a capability heretofore unavailable. Furthermore, it is necessary to detect even the smallest discontinuity in order to evaluate its influence upon the performance of a missile and to permit useful statistical data to be compiled from which minimal inspection specifications can be prepared. The absence of flaws is of the utmost importance if a consistent burning rate and accurate flight trajectory are to be assured. A major contribution toward insuring successful performance and safety of solid propellant missiles such as the Polaris, Skybolt, and Minuteman is the early detection of defects which may exist either at a depth within the propellant or at the bond between the casing liner and the fuel. ![]()
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