Section 325.5438. Class AA installations.

(1) In class AA installations the accelerator and objects exposed thereto shall be contained within a permanent enclosure.

(2)   The enclosure shall be constructed such that the radiation exposure dose equivalent rate as measured in air at a distance of 5 centimeters from any accessible point on the external surface shall not exceed 2 millirems per hour under conditions of maximum radiation output permitted by the design  or operating characteristics of the accelerator.

(3)   Mechanical or electrical limiters shall limit movement or alignment of the accelerated beam within the enclosure if necessary to comply with subrule (2).

(4)   A personnel barrier posted in accord with rules 224 to 231 restricting access to the roof of the enclosure shall meet the requirement of subrule (2).

(5)    Reliable interlocks shall be provided which will prevent anyone from opening the enclosure while the accelerator is in operation or which will terminate machine operation should  anyone open  the   enclosure. These interlocks shall comply with rule 448.

(6)   Enclosures of sufficient size to permit human occupancy shall be provided with visible or audible signals or both within the enclosure which are activated a minimum of 5 seconds before accelerator operation. Persons shall at all times be able to escape from within the enclosure.

(7)    An individual shall not be permitted to remain within the enclosure while the accelerator is in operation except as a human  patient  undergoing radiation treatment.

(8)   Protective enclosures and equipment shall be kept in good repair.

(9)   Electron beam welders shall meet class AA requirements.

(10)   Class AA approval permits unlimited use at maximum capacity.

History: 1979 AC.