NAC459.538. “X-ray field” defined.

Latest version.

“X-ray field” means the area of the intersection of the useful beam and any one of the set of planes parallel to and including the plane of the image receptor, whose perimeter is the locus of points at which the exposure rate is one-fourth of the maximum in the intersection.

[Bd. of Health, Radiation Control Reg. § 6.2.67, eff. 2-28-80]

                    
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