What is the maximum allowable exposure in an unrestricted area?

In radiation safety, an unrestricted area is defined as a space where the general public can access without any specific restrictions regarding radiation exposure. The regulatory guidelines specify that the maximum allowable radiation exposure for individuals in such areas is set to ensure public safety.

The correct answer is 2 mR/hr, which aligns with the limits established by agencies such as the Nuclear Regulatory Commission (NRC). This standard helps minimize the risk of radiation exposure to the general population in areas where they may regularly spend time, ensuring that the radiation levels remain safe and do not exceed what is considered acceptable for public health.

Maintaining such an exposure level is crucial for protecting individuals from potential health hazards associated with radiation, particularly in environments where there might be a mix of workers and non-workers. Therefore, the limit of 2 mR/hr is established to provide a balance between the necessity of using radiation in medical and industrial applications and the protection of the public from unnecessary radiation exposure.