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This is a special X-ray film cassette which produces a pattern on the X-ray film caused by differing attenuations through various thicknesses of copper in the cassette. The pattern produced allows calculation of the kilovoltage of the X-ray set.
A general term for this device is a penetrameter, and more details are given under that heading.
Content and Design Copyright 2000 Dr. Malcolm C Brown. See Title Page for more details