Significance and Use All X-ray systems are subject to changing
efficiencies, so a practice for checking the overall operation
is needed. This practice will assure the operator of an
optimized image when ambient conditions are controlled and the
X-ray high voltage generator is adjusted as prescribed. The
densities of some tire cord materials are very close to that of
the rubber matrix in which they are enclosed, so the resolving
capability of an X-ray system is critical to the detection of
abnormalities. The rubber-cord pie disk provides a means for
optimizing the resolving power in a particular apparatus and for
comparing its performance over any period of time. The rubber-
cord pie disk can be used to compare the performances of X-ray
systems in different laboratories. It can also be used in
special cases to optimize system performance for a particular
sector or cord-type, as may be required for examining a specific
tire. FIG. 2 Pie-Cord Disk Test Fixture 1.1 This practice
describes the construction and use o