Which statement best describes a High Radiation Area?

• A. An area where a person could receive over 100 mrem per hour at 30 cm
• B. An area where a person could receive over 1000 mrem per hour at 30 cm
• C. An area with any measurable radiation
• D. An area where radiation dose is negligible

Answer: (A)

High Radiation Area is defined by the potential for a person to receive more than 100 mrem in one hour from external radiation. The distance of measurement matters because dose rates decrease with distance; stating the rate at 30 cm highlights the proximity where the exposure could exceed the threshold in an hour. If a location could deliver more than 100 mrem per hour at that distance, it meets the criterion for a High Radiation Area, which triggers stricter access controls and monitoring. The other descriptions aren’t appropriate: a rate around 1000 mrem per hour defines a Very High Radiation Area; any measurable radiation is not specific enough to indicate a hazardous, high-exposure zone; and negligible dose does not reflect a potential for significant exposure.