Radiography Testing

Radiography Using Gamma Camera material

Radiographic Teting (RT) uses ionizing electromagnetic radiation to view objects in away that can’t be seen otherwise.  It is not to be confused with the use of ionizing radiation to change or modify objects; radiography’s purpose is strictly for viewing.  It is a method of inspecting materials for hidden flaws by using the capability of short wavelength electromagnetic radiation, gamma radiation, to penetrate various materials.

Gamma radiation sources, commonly Iridium-192 (Ir 192) and cobalt 60 (Co 60), are used to inspect a variety of materials.  Radiography concerns the testing materials include concrete )locating rebar or conduit), welder’s test coupons, machined parts, plate metal, or pipe wall (locating anomalies due to corrosion or mechanical damage).  Theoretically, industrial radiographers could radiograph any solid, flat material (walls, ceilings, floors, square or rectangular containers) or any hollow cylindrical or spherical object.

Radiography Using Gamma Camera on Welds

Radiography is one of the useful of the non-destructive tests which can be applied for assessing the quality of the welded joints on pressured piping, pressure vessel, high capacity storage tank, pipelines, and some structural welds.

Radiography can detect flaws or discontinuities in welds such as:

  • Crack.
  • Porosity and blow holes.
  • Slag, flux oxide inclusions.
  • Lack of fusion.
  • Incomplete penetration.
  • Root fusion.
  • Incomplete penetration.
  • Root fusion.
  • Clustered porosity.
  • External & internal undercut, etc.