N.D. Admin. Code tit. 33.1, art. 33.1-10, ch. 33.1-10-06, app C
1. General requirements.
a. Each installation must be provided with such primary or secondary barriers as are necessary to assure compliance with section 33.1-10-04.2-01 [ 10 CFR 20.1201, 20.1207, 20.1208, and 20.1301 ]. This requirement must be deemed to be met if the thicknesses of such barriers are equivalent to those as computed in accordance with appendices B, C, and D of the National Council on Radiation Protection and Measurements Report No. 49, "Medical X-Ray and Gamma-Ray Protection for Energies Up to 10 MeV", modified to meet current dose limits.
b. Lead barriers must be mounted in such manner that they will not sag or cold-flow because of their own weight and shall be protected against mechanical damage.
c. Joints between different kinds of protective materials must be designed so that the overall protection of the barrier is not impaired.
d. Joints at the floor and ceiling must be so designed that the overall protection is not impaired.
e. Windows, window frames, doors, and door frames must have the same lead equivalent as that required of the adjacent wall.
f. Holes in protective barriers must be covered so that overall attenuation is not impaired.
2. Fluoroscopic x-ray systems. Ordinarily only secondary barriers are necessary except combined fluoroscopic-radiographic installations.
3. Radiographic systems other than fluoroscopic, dental intraoral, or veterinarian systems:
a. All wall, floor, and ceiling areas exposed to the useful beam must have primary barriers. Primary barriers in walls must extend to a minimum height of eighty-four inches [2.13 meters] above the floor.
b. Secondary barriers must be provided in all wall, floor, and ceiling areas not having primary barriers or where the primary barrier requirements are lower than the secondary requirements.
c. The operator's station at the control shall be behind a protective barrier, either in a separate room, in a protected booth, or behind a shield which will intercept the useful beam and any radiation which has been scattered only once.
d. A window of lead equivalent glass equal to that required by the adjacent barrier or a mirror system shall be provided large enough and so placed that the operator can see the patient without having to leave the protected area during exposure.
e. For mobile and portable x-ray systems which are used for greater than one week in one location (one room or suite), the requirements of this appendix shall apply.
4. Intraoral dental radiographic systems.
a. Dental rooms containing x-ray machines shall be provided with primary barriers at all areas struck by the useful beam. Consideration shall be given to the attenuation provided by the patient.
b. When dental x-ray units are installed in adjacent rooms or areas, protective barriers shall be provided between the rooms or areas.
Note: In many cases, structural materials of ordinary walls suffice as a protective barrier without addition of special shielding material.
5. Therapeutic x-ray installations. The structural shielding requirements shall be deemed to be met if the barriers have been designed and constructed in accordance with the National Council on Radiation Protection and Measurements Report No. 49, "Medical X-Ray and Gamma-Ray Protection for Energies Up to 10 MeV", modified to meet current dose limits.
6. Veterinary medicine radiographic installations.
a. All wall, floor, and ceiling areas exposed to the useful beam shall have primary barriers. Primary barriers in walls shall extend to a minimum height of eighty-four inches [2.13 meters] above the floor.
b. Secondary barriers shall be provided in all wall, floor, and ceiling areas not having primary barriers or where the primary barrier requirements are lower than the secondary requirements.
N.D. Admin Code tit. 33.1, art. 33.1-10, ch. 33.1-10-06, app C