Historically, ASTM E155 was distributed as physical film or large, high-quality prints enclosed in a binder. This ensured that the interpreter was viewing the image with the exact resolution and dynamic range intended by the standards committee. However, as the industry transitioned to Digital Radiography (DR) and Computed Radiography (CR), the need for digital reference standards became urgent.
October 26, 2023
In the world of nondestructive testing (NDT), consistency is king. When inspecting aluminum and magnesium castings for internal flaws, professionals rely on a single gold standard: . This standard governs the reference radiographs for discontinuities—specifically porosity, gas holes, and inclusions. astm e155 porosity levels pdf repack
This review assumes a high-quality repack. I have seen versions where the gamma is blown out (making Class 1 porosity invisible) or the scaling is off (a 1-inch reference marker becomes 0.8 inches). Ensure your repack includes the original density step wedge and thickness gauge in the scan; otherwise, it is useless for actual comparison. Historically, ASTM E155 was distributed as physical film