Radiography is a technique available within the section capable of administering electromagnetic radiation in either the form of X-rays or gamma rays to uncover internal flaws or defects otherwise unobservable to the operator.

In both the X-ray and gamma ray source arrangement, the specimen is placed between the source and a background film.

The incident radiation is absorbed or scattered by the material in question depending on the localised density at each point across the specimen. This absorption is measured either through the film or through electronic apparatus to show the disparity in radiation interaction, allowing images of the internal structure to be built up with great detail.

For the application of x-rays, a water-cooled X-ray tube is employed whilst for the higher energy gamma exposure, a radioactive isotope is administered for the analysis.

This technique is utilised most effectively for components such as welded parts which have access to both sides of the specimen and require details about the internal quality of the weld. This technique is a trusted way to gain details regarding:

• Porosity
• Inclusions
• Cracks
• Voids

This technique is highly specialised and will be carried out by an experienced member of the section. This technique is more time consuming than others within the section however can provide a sophisticated level of detail.

Warm module radiography