Mich. Admin. Code R. 333.5294 - Class AA installations
Rule 294.
(1)
In class AA installations the radiation machine and objects exposed thereto
shall be contained within a permanent enclosure.
(2) The enclosure shall be constructed such
that the radiation dose rate at a distance of 5 centimeters from any point on
the external surface shall not exceed 0.02 millisievert per hour (2 mrem/h).
The dose rate shall be measured with the source of radiation placed at the
position of closest source-wall distance that is radiographically usable and
under conditions of maximum radiation output permitted by the design or
operating characteristics of the radiation machine.
(3) Mechanical or electrical limiters shall
limit movement or alignment of the radiation machine within the enclosure if
necessary to comply with subrule (2) of this rule.
(4) A personnel barrier posted pursuant to R
333.5067 to R 333.5072 restricting access to the roof of the enclosure shall
meet the requirement of subrule (2) of this rule.
(5) Reliable interlocks shall be provided
which will prevent anyone from opening the enclosure while the radiation
machine is on or which will terminate machine operation should anyone open the
enclosure.
(6) Enclosures of
sufficient size to permit human occupancy shall be provided with visible
signals or audible signals, or both, within the enclosure, which are activated
a minimum of 5 seconds before radiation machine activation. Individuals shall
at all times be able to escape from within the enclosure.
(7) Individuals shall not be permitted to
remain within the enclosure while the radiation machine is in
operation.
(8) Protective
enclosures and equipment shall be kept in good repair.
(9) Industrial fluoroscopy shall meet the
requirements of class AA installations.
(10) Notwithstanding the provisions of
subrule (2) of this rule, the enclosure for industrial fluoroscopy shall be
constructed such that the radiation dose rate at a distance of 5 centimeters
from any accessible point on the external surface shall not exceed 0.005
millisievert per hour (0.5 mrem/h) under conditions of maximum radiation output
permitted by the design or operating characteristics of the
installation.
(11) Industrial
cabinet radiography conducted in enclosures of insufficient size to permit
human occupancy shall meet the requirements of class AA
installations.
(12) Notwithstanding
the provisions of subrule (2) of this rule, the enclosure for industrial
cabinet radiography of insufficient size to permit human occupancy shall be
constructed such that the radiation dose rate at a distance of 5 centimeters
from any accessible point on the external surface shall not exceed 0.005
millisievert per hour (0.5 mrem/h) under conditions of maximum radiation output
permitted by the design or operating characteristics of the
installation.
(13) For class AA
enclosures of sufficient size to permit human occupancy, a personnel radiation
dosimeter shall be permanently assigned to each occupationally exposed
individual. This monitoring shall be continuous during employment as a
radiation worker.
(14) Personnel
exposure records shall be kept on permanent available file at the facility
where the exposure occurs for inspection by the department.
(15) Class AA approval permits unlimited use
at maximum capacity.
Notes
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