Which of the following describes an area with restricted access that is under radiation safety protocols?

The term that best describes an area with restricted access that is governed by radiation safety protocols is a controlled area. Controlled areas are designated zones where access is limited to authorized personnel due to the presence of radiation or other hazards. In such areas, specific safety measures and protocols are implemented to minimize exposure to radiation and ensure the health and safety of individuals working within or near that zone.

This distinction is essential for maintaining safety in environments where radiation is a concern, as controlled areas allow for monitoring and protective measures to be in place, contrasting with uncontrolled areas, free access areas, and public areas, where access may not be restricted, and safety measures are not as rigorously enforced.