An area accessible where a person could receive more than 100 mrem in one hour at 30 cm from the source is called which?

An area accessible where a person could receive more than 100 mrem in one hour at 30 cm from the source is called which?

• A. Radioactive Material Area
• B. Radiation Area
• C. High Radiation Area
• D. Airborne Radioactivity Area

Answer: (C)

Area classifications in radiation safety are based on the potential dose rate at a specified distance from the source. If an area is accessible where a person could receive more than 100 mrem in one hour at a distance of 30 cm from the source, that area is designated as a High Radiation Area. The reason this is the best label is that it reflects a very high exposure rate in close proximity, which triggers stricter access controls and protective measures. A Radiation Area is a broader category defined by higher-than-background levels, but the threshold is lower (typically around 5 mrem per hour at a standard distance). Since the scenario exceeds 100 mrem per hour, it clearly fits the higher-risk category. A Radioactive Material Area refers to where radioactive materials are present or used, not specifically to the dose rate in the area. An Airborne Radioactivity Area is associated with airborne contamination, not the general external dose rate at the location.

Area classifications in radiation safety are based on the potential dose rate at a specified distance from the source. If an area is accessible where a person could receive more than 100 mrem in one hour at a distance of 30 cm from the source, that area is designated as a High Radiation Area. The reason this is the best label is that it reflects a very high exposure rate in close proximity, which triggers stricter access controls and protective measures.

A Radiation Area is a broader category defined by higher-than-background levels, but the threshold is lower (typically around 5 mrem per hour at a standard distance). Since the scenario exceeds 100 mrem per hour, it clearly fits the higher-risk category. A Radioactive Material Area refers to where radioactive materials are present or used, not specifically to the dose rate in the area. An Airborne Radioactivity Area is associated with airborne contamination, not the general external dose rate at the location.