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Shutters and masks can help limit the radiation beam as it is directed toward the part, thereby decreasing scatter radiation by narrowing and decreasing beams to a specific location. Shutters are usually mounted on the front of the image intensifier and help keep radiation not passing through the part from impinging on image intensifier screen and causing phosphor blooming. Figure 15 shows examples of collimators and shutters.


Figure 15. Photographs of a beam collimator mounted on the x-ray tube on the left and shutters to the front of an image intensifier on the right.