What is the acceptable exposure limit at 30cm from a source to classify an area as restricted?

The acceptable exposure limit at 30cm from a source to classify an area as restricted is 2 mrem/hr or 100 mrem/yr. This limit is based on guidelines established to ensure the safety and health of individuals who may access or work in areas where radiation is present.

To classify an area as restricted, the exposure levels must be above certain thresholds, indicating that additional safety measures are necessary to protect individuals from potential harmful effects of radiation. The 2 mrem/hr rate is significant as it is aligned with regulatory standards that account for both short-term and long-term exposure risks. Essentially, it reflects a balance between maintaining safety in environments where radiation is utilized while still allowing some level of operational flexibility.

In contrast, other options either set the exposure limit below what is typically required for a restricted area or exceed guidelines that might expose individuals to unnecessary risk. Hence, the specified limit of 2 mrem/hr or 100 mrem/yr ensures that appropriate safety protocols can be implemented in environments where radiation is handled.