A test piece with significant differences in thickness will have what kind of subject contrast?

A test piece with significant differences in thickness will produce high subject contrast in radiographic testing. This occurs because varying material densities and thicknesses affect how radiation is absorbed or transmitted through the test piece. When there are large discrepancies in thickness, areas that are thicker will absorb more radiation, resulting in darker regions on the radiograph, while thinner areas will allow more radiation to pass through, appearing lighter. This stark contrast between the dark and light areas creates high subject contrast, allowing for better differentiation of details in the radiograph.

In imaging, high subject contrast is advantageous as it enhances the visibility of defects or variations within the material, making it easier for the inspector to evaluate quality and integrity.