NAC459.620. Other radiographic systems: Special purpose systems.

For special purpose X-ray systems:

     1. A means must be provided to limit the X-ray field in the plane of the image receptor so that the field does not exceed each dimension of the image receptor by more than 2 percent of the source-image receptor distance when the axis of the X-ray beam is perpendicular to the plane of the image receptor.

     2. A means must be provided to align the center of the X-ray field with the center of the image receptor to within 2 percent of the source-image receptor distance.

     3. Subsections 1 and 2 may be met with a system that meets the requirements for a general purpose X-ray system as specified in NAC 459.618, or, when alignment means are also provided, may be met with either:

     (a) An assortment of removable, fixed-aperture, beam-limiting devices sufficient to meet the requirement for each combination of image receptor size and source-image receptor distance for which the unit is designed with each such device having clear and permanent markings to indicate the image receptor size and source-image receptor distance for which it is designed; or

     (b) A beam-limiting device having multiple fixed apertures sufficient to meet the requirement for each combination of image receptor size and source-image receptor distance for which the unit is designed. Permanent, clearly legible markings must indicate the image receptor size and source-image receptor distance for which each aperture is designed and indicate which aperture is in position for use.

     [Bd. of Health, Radiation Control Reg. §§ 6.6.1.4-6.6.1.4.3.2, eff. 2-28-80]