North Dakota Administrative Code › Title 33.1 - Department of Environmental Quality › Article 33.1-10 - Radiological Health Rules › Chapter 33.1-10-06 - X-Rays in the Healing Arts › Appendix C - STRUCTURAL SHIELDING REQUIREMENTS

Current through Supplement No. 393, July, 2024
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.