BS EN ISO 20769-2. Non-destructive testing. Radiographic inspection of corrosion and deposits in pipes by X- and gamma rays. Part 2. Double wall radiographic inspection— 41 стр.
BS EN ISO 20769-1. Non-destructive testing. Radiographic inspection of corrosion and deposits in pipes by X- and gamma rays. Part 1. Tangential radiographic inspection— 54 стр.