You found the Acceptance levels for radiographic testing (imperfections for welds) in the ISO 10675.
This App calculated the value for one concretely weld.
Select the material, then input the geometry of the weld, then select the imperfections.
The result for this weld is displayed.
You can now the result compared with the measurement.
The weld is OK or not.
Only internal indications in butt welds. Surface imperfections use the App CalcISO5817.