According to NRC regulations, which sign should be posted in unrestricted areas?

In unrestricted areas, the Nuclear Regulatory Commission (NRC) regulations do not require any specific warning signs to be posted. Unrestricted areas are defined as locations where individuals have access without any restrictions, and the radiation levels present in these areas are considered to be safe for the general public. Therefore, while areas with higher radiation or radioactive materials may require signage to alert individuals to potential hazards, unrestricted areas do not need such postings.

This approach ensures that individuals who are not trained in radiation safety can still access the area without encountering any undue alarms or confusion regarding radiation hazards. As a result, there is no necessity to post caution signs in these spaces, conforming to the regulatory framework intended to protect both workers and the public while maintaining accessibility.