Michigan Administrative Code › Department - Labor and Economic Opportunity › MIOSHA › X-Ray Machine Registration › Ionizing Radiation Rules Governing the Use of Radiation Machines › Part 6 - INDUSTRIAL RADIOGRAPHIC OPERATIONS AND INSTALLATIONS › CLASSIFICATION › Section R. 333.5294 - Class AA installations

Current through Vol. 24-12, July 15, 2024
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.