What are the standard radiation safety zones called, and what are their access controls?

• A. Radiation Area, High Radiation Area, and Very High Radiation Area; access increased restrictions, postings, dosimetry, and strict procedures to control entry.
• B. Controlled Area, Limited Area, and Restricted Area.
• C. Safe Zone, Warning Zone, and Danger Zone.
• D. Radiation Area, High Radiation Area, and Very High Radiation Area with flexible access.

Answer: (D)

The idea being tested is how radiation safety zones are defined and how access is controlled as risk increases. The standard names are Radiation Area, High Radiation Area, and Very High Radiation Area. As the potential for exposure grows, the rules for entering become more stringent. A Radiation Area is posted and entry is controlled to limit exposure. A High Radiation Area requires even tighter controls: only trained personnel may enter, dosimeters are used to monitor exposure, and there are formal entry procedures. A Very High Radiation Area demands the most restrictive measures, with explicit authorization, enhanced dosimetry, interlocks or other entrance controls, and carefully prescribed procedures to minimize time spent inside. The core concept is that higher risk areas require stronger entry controls, postings, and monitoring to protect workers. The other naming options don’t reflect this standard progression, and the idea of “flexible access” contradicts the need for tight access controls.