What safety sign should be displayed at access points to controlled areas?

Displaying a sign that reads "Caution - Radiation Area" or "Danger - High Radiation Area" at access points to controlled areas is essential for ensuring the safety of personnel and the public. These signs are specifically designed to warn individuals about the presence of radiation hazards.

The "Caution - Radiation Area" sign indicates that radiation levels may expose individuals to doses exceeding a certain threshold, while the "Danger - High Radiation Area" sign denotes locations where radiation levels could be even higher, posing a greater risk. These warning signs communicate the potential danger effectively, allowing people to take necessary precautions or avoid entry if they are not authorized or not equipped with the proper protective measures.

In contrast, options like "Exit - No Entry," "Danger - High Temperature Zone," or "Authorized Personnel Only," while they may serve important purposes in other contexts, do not specifically convey the radiation hazards present in controlled areas. Therefore, using the appropriate radiation warning signs is crucial for maintaining safety protocols in environments where radiation is present.