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7 AAC 18.430. Shielding. (a) A medical or veterinary x-ray installation must include the primary barriers and secondary barriers necessary to assure compliance with the provisions of 7 AAC 18.210, 7 AAC 18.240, and 7 AAC 18.250. The requirements of this section are met if the thickness and design of the barriers are equivalent to those computed and designed in accordance with the recommendations of the National Council on Radiation Protection and Measurements (NCRP) in NCRP Report No. 147, “Structural Shielding Design for Medical X-ray Imaging Facilities,” issued November 19, 2004, and adopted by reference. (b) A medical or veterinary x-ray installation must have a lead barrier that is mounted in a manner to ensure that the barrier will not sag or cold-flow because of the barrier’s own weight and that are protected against mechanical damage. (c) All structural joints in a medical or veterinary x-ray installation, including those between different kinds of protective materials and joints at the floor and ceiling, must be designed in a manner that ensures that the overall protection provided by the barrier is not impaired. (d) A window, window frame, door, and door frame in a medical or veterinary x-ray installation must have the same lead equivalent as that required for the adjacent wall. (e) A hole in a protective barrier in a medical or veterinary x-ray installation must be covered in a manner that ensures that the overall protection is not impaired. (Eff. 4/9/2009, Register 190) Statutory Authority: Authority: AS 18.60.475 AS 18.60.485 Editor’s note: The NCRP Report No. 147, “Structural Shielding Design for Medical X-ray Imaging Facilities,” adopted by reference in 7 AAC 18.430(a), is available from NCRP Publications, 7910 Woodmont Avenue, Suite 400, Bethesda, MD 20814-3095 or at the following Internet site: www.ncrponline.org. 7 AAC 18.440. Fluoroscopic installation. (a) A healing arts fluoroscopic installation and C-arm must use an image intensification assembly and a diagnostic-type protective x-ray tube housing and must meet the requirements of this section.