Film radiography uses photographic film and a source of ionising radiation placed on either side of a test object to reveal the internal structure. The radiation is partly absorbed during transmission and differences in the amount of absorption are recorded on the film.
Digital radiograph involves the same basic principles as conventional film radiography except the resultant image is stored and displayed on a PC. The advantage of this technique is that the digital image can be processed, enhanced and communicated much faster than a conventional film. There are three main ways of capturing a digital radiograph: the first is to scan a conventional film radiograph in a specialist scanner (similar to a document scanner). The second is to use a 'flat-panel' similar to a digital camera, which converts the X-ray quanta directly into an electric charge. The flat panel is positioned in the same place as the film and is connected directly to a PC. The third method is known as Computed Radiography (CR). This technique uses Phosphor imaging plates to capture the radiograph and a laser scanner is used to digitise the image.
Radiographic testing can be used in various industries such as electronics, Oil & Gas, nuclear and aerospace. Currently, TWI are involved in projects to enable underwater digital radiography for the Oil & Gas industry.
We can provide consultancy on:
- Computed Tomography (CT)
- Digital Radiography (DR)
- Film Radiography
- Real Time Micro-focus Radiography
Advantages of Radiography
- Gives a permanent record (the radiograph).
- Can detect internal flaws
- Can be used for most materials
- Can be used for functionality testing of integrated components
- Provides direct image of the defect
For more information, please contact us.
