Radiographic Testing (RT)
Method of inspecting materials for hidden flaws by using the ability of short wavelength electromagnetic radiation (high energy photons) to penetrate various materials.
In Radiography Testing the test piece is placed between the radiation source and film (or detector). The material density and thickness differences of the test piece will attenuate the penetrating radiation through interaction processes involving scattering and/or absorption. The differences in absorption are then recorded on film(s).
There are two different radioactive sources available for industrial use;
» X-ray, and
» Gamma-ray.
These radiation sources use higher energy level, i.e. shorter wavelength, versions of the electromagnetic waves. Because of the radioactivity involved in radiography testing, it is of paramount importance to ensure that the Local Rules is strictly adhered during operation.
Benefits
» Can inspect assembled components
» Minimum surface preparation required
» Detects both surface and subsurface defects
» Provides a permanent record of the inspection
» Verify internal flaws on complex structures
» Isolate and inspect internal components
» Automatically detect and measure internal flaws
» Measure dimensions and angles within the sample without sectioning
» Sensitive to changes in thickness, corrosion, flaws and material density changes
