Radiography (X-rays / Gamma rays) is used to produce images of objects using film or other detector that is sensitive to radiation. This variation in radiation produces an image on the detector that shows internal features of the test object
Film and processing chemicals are used in this popular method
One of the biggest advantages of the use of digital radiography is its ability to significantly reduce the radiation dose in comparison to film applications. In addition, new imaging techniques have increased the capacity for visualization of defects and revealed new potential for accurate evaluation.
Computed radiography uses, flexible, photo-stimulable phosphor (PSP) plate loaded into a cassette and exposed in a manner similar to traditional film radiography. The cassette is then placed in a laser reader where it is scanned and translated into a digital image. Once digitally captured, the image may be stored on a computer or other electronic media. Archiving is made easier and the images can be electronically distributed to others for viewing