Which measurement indicates the effectiveness of a radiographic inspection?

The effectiveness of a radiographic inspection is primarily indicated by penetrameter sensitivity. A penetrameter, commonly referred to as a "step wedge" or "density step," is a device made of a material similar to that being inspected and is used to verify the sensitivity and responsiveness of the radiographic system used. It provides a benchmark for the detection of flaws by introducing known thickness variations into the radiation beam, which allows for the assessment of image quality and contrast.

Penetrameter sensitivity helps establish the minimum detectable size of defects within the examined material, thus directly relating to the reliability and accuracy of the inspection results. A radiographic technique yielding a higher sensitivity will allow for the identification of smaller defects, leading to a more effective and comprehensive inspection.

While exposure time, filtration levels, and radiation dose are important parameters in the radiographic process, they do not directly measure the quality of the inspection's capability to detect flaws. Exposure time affects the amount of radiation that reaches the film or detector, filtration levels can influence the quality of the radiation beam, and radiation dose pertains to safety and compliance. However, none of these factors provide a direct assessment of how effectively the inspection can identify discontinuities or defects within the material itself.