Radiographic Testing (RT)
RT uses Electromagnetic Radiation (X-Ray, Gamma) that creates an image of the inside of a surface. Common indications found are voids, inclusions, cracks, internal corrosion, stress corrosion cracking, and defective welds.
A radiograph is the permanent record of the internal condition of a weld or material used for quality inspection purposes. The same discontinuities can be radiographed again after a period of service life and the radiographs can be compared to measure the change in the size and shape of the discontinuity.
Radiographic Testing can be produced a direct image of flaws and applicable to metals, non-metals and composites.