What radiation dose defines a Radiation Area?

The definition of a Radiation Area is determined by the level of radiation exposure that individuals could receive in that area. According to the regulations set forth by the U.S. Nuclear Regulatory Commission (NRC), a Radiation Area is defined as one where the dose rates are greater than 0.005 rem (or 5 mRem) in any one hour at 30 centimeters from a radiation source.

In this context, the correct choice is based on the established threshold of 5 mRem/hr. This dose rate signifies the potential for exposure that necessitates monitoring and specific protective measures to ensure safety for personnel and the public. Therefore, identifying a Radiation Area using this threshold serves to establish limits for access and ensure that those who enter such areas are aware of potential radiation exposure risks.