What is the definition of a Controlled area?

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In radiation protection, a Controlled area is the zone where radiation exposure is anticipated and access is actively managed to protect staff and others. This area is centered around where the radiation source is used and near the patient, so shielding, signage, and monitoring (like dosimeters) are applied there. The idea is to keep exposure within safe limits for workers who operate in or pass through this space. That’s why the immediate area surrounding the source and the patient is the proper description. The entire hospital building isn’t designated as a Controlled area, outdoor grounds aren’t specific to radiation containment, and a storage room isn’t defined by the need to control access for radiologic procedures.