step wedge


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step wedge

A quality control device consisting of increasing thicknesses of absorber through which radiographs are taken to determine the amounts of radiation reaching the film.
See also: wedge

step wedge

(step wej)
Triangular aluminum device placed over a radiographic film during exposure to determine the penetrating ability of an x-ray beam.
Synonym(s): penetrometer.
References in periodicals archive ?
Adding white noise by randomisation to account for step wedge uncertainty produced visible but small broadening in the uncertainty intervals on the plots.
Caption: Figure 8: Comparison of the Low Contrast Value (LCV) for the Thicker Aluminum Step Wedge. (a) Exposure condition with only the aluminum step wedge.
Aluminum step wedges of six thicknesses (0.5, 1.0, 1.5, 2.0, 2.5, and 3.0 mm) and an aluminum plate of 3 mm height were manufactured from an aluminum block of 99.9% purity (Figure 1).
Three aluminum step wedges were simultaneously exposed to three detector systems: the two PSP systems and a CCD sensor.
Since step wedges are not readily available for security personnel to use, other tests can be used.
In dual energy systems, at least 24 AWG solid copper wire should be visible through all 10 levels of an ASTM step wedge, and at least 30 AWG solid copper wire should be visible through five levels of an ASTM step wedge.