R 333.5298 Class C installations.

Rule 298. (1) Class C installations shall comply with all requirements of R 333.5296 except for a permissible dose rate of 0.5 millisievert (50 mrem) per hour at any accessible external point. (2) The maximum weekly exposure time of radiation machines within the enclosure shall be established by the department under the conditions specified by the registrant at the time of application. (3) Warning signs shall be posted in those areas outside the enclosure in which the radiation dose rate at any accessible external point exceeds 0.02 millisievert per hour (2 mrem/h). The dose rate shall be measured with the radiation machine tube placed at position of nearest source-wall distance that is radiographically usable under conditions of maximum radiation output permitted by the design or limited operating characteristics of the radiation machine.