NF A09-205-5:2013 Non-destructive testing - Image quality of radiographs - Part 5: Determination of the image unsharpness value using duplex wire-type image quality indicators
2013NF A09-205-5:2013 Non-destructive testing - Image quality of radiographs - Part 5: Determination of the image unsharpness value using duplex wire-type image quality indicators
1996NF A09-205-5:1996 Non-destructive testing. Image quality of radiographs. Part 5 : image quality indicators (duplex wire type), determination of image unsharpness value.