Tungsten Alloy Collimator in Industrial Radiography

For industrial radiography using gamma radiation sources such as Iridium-192 or Cobalt-60, a tungsten alloy collimator (beam limiting device) allows the radiographer to control the exposure of radiation to expose a film and create a radiograph, to inspect materials for defects. A tungsten alloy collimator in this instance is most commonly made of tungsten alloy foils, and is rated according to how many half value tungsten alloy layers it contains, i.e., how many times it reduces undesirable radiation by half. For instance, the thinnest walls on the sides of a 4 HVL tungsten  alloy collimator 13 mm (0.52 in) thick will reduce the intensity of radiation passing through them by 88.5%. The shape of these collimators allows emitted radiation to travel freely toward the specimen and the x-ray film, while blocking most of the radiation that is emitted in undesirable directions such as toward workers.

The photograph below shows tungsten alloy materials to manufacture collimator.

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