What is the maximum surface dose rate allowable for operating an exposure device?

The maximum surface dose rate allowable for operating an exposure device is set at 200 milliroentgen per hour. This limit is in place to ensure the safety of both operators and the public by minimizing exposure to ionizing radiation. The choice of 200 milliroentgen per hour represents a balance between effective operation of the exposure device and the need to keep radiation exposure as low as reasonably achievable.

Designating this specific threshold allows for adequate monitoring and control of radiation emissions while ensuring that those working with the equipment can do so safely. Exceeding this limit could lead to unacceptable levels of radiation exposure, which is why it is crucial to adhere to this standard for safe practices.

The other choices indicate higher limits that do not comply with established safety regulations, emphasizing the importance of adherence to the specific guideline of 200 milliroentgen per hour to protect health and comply with regulatory standards.