T.O. 33B-1-16-516-22 shows that, for a given subject, a doubling of kilovoltage increases transmitted radiation 15 to 30 times. Thisexample shows the disproportionate effect a small kilovoltage change can have upon a particular inspection.Figure 6-21. Effect of Kilovoltage on Transmitted Radiation Output.a. 38 kVp, 5 minutes b. 80 kVp, 5 secondsFigure 6-22. Radiographs of Honeycomb Showing Effect of Kilovoltage on Contrast.6.7.2.1.1If industrial radiographic applications were to use monochromatic radiation and if there was no scattering to beconsidered, the radiation absorption could be mathematically calculated with high precision using the classicalattenuation equation. However, in normal applications, it is not possible to calculate the right kilovoltage to be used fora particular inspection because this optimum condition does not exist. The best initial approach is to use pastexperience. Table 6-12 indicates approximate radiation energies compatible with various subjects.
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
