DIN EN ISO 20769-2:2018
無損檢驗. X射線和γ射線對管道腐蝕和沉積物的射線檢驗. 第2部分: 雙壁射線探傷(ISO 20769-2-2018); 德文版本EN ISO 20769-2-2018
Non-destructive testing - Radiographic inspection of corrosion and deposits in pipes by X- and gamma rays - Part 2: Double wall radiographic inspection (ISO 20769-2:2018); German version EN ISO 20769-2:2018