Nondestructive Testing (NDT)
Nondestructive testing (NDT) refers to the method of examining material and components in order to identify and quantify defects and degradation in material properties before they result in failure. The goal of NDT is to ensure the safe utilization of engineering structures, as well as to assure product quality and performance on production. Key to NDT is the ability to evaluate defects in objects without having to physically break them up and test them.
NDT encompasses a host of non-invasive measurement techniques including radiography. X-rays are produced by high-voltage X-ray machines whereas gamma rays are produced from radioactive isotopes such as Iridium 192. The X-rays or gamma rays are placed close to the material to be inspected and are passed through it and captured on a medium, such as film. This film is then processed and the image is obtained as a series of grey shades between black and white. The choice of radiation type (X-ray or gamma rays) depends on the thickness of the material to be tested. Gamma sources have the advantage of portability, which makes them ideal for use in construction-site working.
RMD’s research in radiation detection materials can be used in the latest versions of X-ray NDT to increase their sensitivity thereby enhancing their ability to find more minute defects.