2013DIN EN ISO 19232-2:2013 Non-destructive testing - Image quality of radiographs - Part 2: Determination of the image quality value using step/hole-type image quality indicators (ISO 19232-2:2013); German version EN ISO 19232-2:2013
1994DIN EN 462-2:1994 Image quality test body (step/hole type) — Determination of the image quality number