Which area designation statement is true?

• A. Unrestricted areas require access control.
• B. All areas require the same level of control.
• C. Reception areas are examples of controlled areas.
• D. Controlled areas require access control and monitoring; example X-ray exam rooms; Unrestricted areas require no special control.

Answer: (D)

In radiation protection, spaces are designated as controlled (restricted) or unrestricted based on potential exposure and the need for safeguards. Controlled areas are where radiation work or sources are present, so access is limited and there are monitoring and control measures in place to manage exposure. Unrestricted areas are places where exposure is minimal and no special controls are needed; they should not require access restrictions.

The statement that controlled areas require access control and monitoring, with X-ray exam rooms as a typical example, and that unrestricted areas require no special control, aligns with how these designations are applied. Reception areas are not considered controlled; they’re typically unrestricted.

The other ideas are not accurate because unrestricted areas do not require access control, not all areas have the same level of control, and reception areas are usually unrestricted.