Controlled area
An area the licensee can limit access for any reason
Radiation area
Area that an individual could receive from a source, 5mrem in 1 hour at 30cm from source
High Radiation Area
Area that an individual could receive from a source, 100 mrem in 1 hour at 30cm from source
Very high radiation area
Area that an individual could receive from a source, 500 rad in 1 hour at 1 meter from source
Restricted area
Area of limited access for the purpose of protecting individual from unnecessary exposure from radiation
Unrestricted area
An area an individual could receive from an external source a maximum dose of 2mrem/hr (20uSv/hr)