Ontario Power Generation (OPG) Orange 1 Practice Test

Radioactive Work Area is a space where radioactive work is being done and there is potential for radioactive material to become airborne and to contaminate surfaces. The key threshold is 1 MPCa, which means the airborne radioactivity in that area is at least the maximum permissible concentration for air. If the area has airborne activity at or above this level and there is any loose contamination on surfaces, it becomes an RWA so stricter controls, access restrictions, monitoring, and decontamination procedures apply. This setup protects workers from elevated inhalation doses and prevents the spread of contamination. Areas with no radioactive work, or areas that contain only sealed sources (which do not release contamination), do not meet the criteria for an RWA. An area used only for breaks is not involved in handling radioactive material and would not be designated as an RWA.