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stepwedge

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stepwedge,
n an aluminum device that, when exposed to roentgen rays, displays a range of exposure intensities on a radiograph. These “steps” are analyzed to determine the speed characteristics of the radiographic film. See also penetrometer.
stepwedge
a block of aluminum shaped like a series of steps. Used to test the characteristics of the x-ray beam, film, filters and to standardize exposure factors.
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