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Radiography Testing (RT)

General Principles of Radiography

The part is placed between the radiation source and a piece of film. The part will stop some of the radiation. Thicker and more dense area will stop more of the radiation.

  • The energy of the radiation affects its penetrating power. Higher energy radiation can penetrate thicker and more dense materials.
      • The radiation energy and/or exposure time must be controlled to properly image the region of interest
      • The film darkness (density) will vary with the amount of radiation reaching the film through the test object.
        • Radiography Interpretation of Weld Discontinuities:


          • Technique is not limited by material type or density.
          • Can inspect assembled components.
          • Minimum surface preparation required.
          • Sensitive to changes in thickness, corrosion, voids, cracks, and material density changes.
          • Detects both surface and subsurface defects.
          • Provides a permanent record of the inspection.