What is BS EN 12679 - Determination of the size of industrial radiographic gamma sources about?
BS EN 12679 specifies the determination of the size of gamma radiographic sources of 0,5 mm or greater, made from the radionuclides Iridium 192, Ytterbium 169, Selenium 75 or Cobalt 60, by a method of radiography with X-rays. The source size of a gamma radiography source is an important factor that affects the image quality of gamma-ray images. The source size is determined with an accuracy of ± 10 % but typically not better than ± 0,1 mm.
The source size is provided by the manufacturer as the mechanical dimension of the source insert. A measurement may be required if the manufacturing process is validated or monitored after the implementation of the source into the holder.
BS EN 12679 can be used for other radionuclides after validation. The standard test method ASTM E1114provides further information on the measurement of the Ir-192 source size, the characterization of the source shape, and its correct assembly and packaging.
Who is BS EN 12679 - Determination of the size of industrial radiographic gamma sources for?
BS EN 12679 on determination of the size of industrial radiographic gamma sources is useful for:
- Radiographers
- Researchers
- Quality testing labs
Why should you use BS EN 12679 - Determination of the size of industrial radiographic gamma sources?
BS EN 12679 provides the requirements for digital equipment which include digital detectors. Digital detectors, which are either imaging plates or digital detector arrays (DDA), may be used for film replacement. BS EN 12679 specifies that the digital detector must possess a pixel pitch that is at least 40 times smaller than the nominal source size to measure and shall not exceed 50 μm. Digital images are evaluated by an image processing software with contrast, brightness (window leveling), profile, pixel size calibration, and zoom function. Digital images show the gamma source with a certain magnifying factor. It is normalized by the magnifying factor for the measurement of the source size.
BS EN 12679 provide information about the identification of the source, focal spot size of the X-ray equipment, magnification factor, dimension of the reference object, parameters of X-ray equipment, and exposure parameters.