R 333.5407 Enclosures.

Rule 407 (1) An enclosure shall be a permanent part of the building or equipment. Portable shields shall not be used for permanent installations. (2) The degree of protection required for an enclosure shall be determined by the workload, use and occupancy factors, and the tube potential, tube current, mechanical movement, and distance. The design shall be subject to approval by the department. (3) In a radiographic room, wall and floor areas exposed to the useful beam plus an additional area extending at least 30 centimeters (1 foot) beyond shall be provided with a primary protective barrier as determined by workload, use and occupancy factors, and distance. All vertical primary protective barriers specified in this rule shall extend continuously from the floor to a minimum height of 2.1 meters (7 feet). (4) Secondary protective barriers shall be provided in the radiographic room ceiling and in those walls not requiring primary barriers. (5) Control apparatus for the radiographic equipment shall be shielded by a primary protective barrier which cannot be removed from a protective position between the operator and the radiation source during machine operation. (6) Movable barriers with electrical interlocks shall not be approved in place of compliance with subrule (5) of this rule. (7) The primary exposure switch location and control shield shall be oriented so that, at arm's length from the exposure switch, the operator shall not be exposed to the useful beam, leakage radiation, or radiation which has been scattered only once. (8) The operator shall be able to see and communicate with personnel within the room from a shielded position at the control panel. When an observation window is provided, it shall have a lead equivalence at least equal to that required of the control barrier and shall be installed so that the attenuation effectiveness of the barrier is not impaired. (9) At times it may be necessary for personnel to remain within operating room or special procedure installations during radiographic exposures. A primary protective barrier shall be provided for personnel protection under these circumstances unless necessary technique prevents its use. This barrier may be movable if necessary. Movable barriers shall not be permitted in place of the provisions of subrules (3) and (5) of this rule.