This part of ISO 19232 gives instructions for the determination of image quality values and image qualitytables.If the IQI requirements from part 3 of this standard cannot be used, because, for example, the absorptioncoefficients of the IQI material and the inspected material differ by more than 30 %, test exposures arenecessary to determine acceptance of image quality values. The image quality values achieved by the testexposures are required for all exposures made under the same radiographic conditions.