A Radiation Area is defined as an area where a major portion of the body could receive in any one hour a dose exceeding how many millirem?

• A. 10 millirem
• B. 50 millirem
• C. 100 millirem
• D. 5 millirem

Answer: (D)

Radiation areas are defined by the potential dose a person could receive in a given hour, which drives what protective controls are needed. A Radiation Area is the space where a major portion of the body could receive more than a small amount in one hour. That threshold is five millirem per hour. Because exposure could reach or exceed this level, basic protections like postings, access controls, and continued monitoring apply in such areas. The other numbers represent higher dose levels that fall into different, more restrictive categories, not the defining limit for a Radiation Area.