Inner cordoned area (safety perimeter)

Inner cordoned area (safety perimeter) for a radiological emergency.
Situation with potentially dangerous sourceArea
Initial determination — outside
Unshielded/damaged30m around
Major spill100m around
Fire, explosion or fumes300m radius
Suspected bomb (potential RDD) 400m radius or more
Initial determination — inside a building
Damage, loss of shielding or spillAffected and adjacent areas, including floors above and below
Fires/other event spreading materials throughout the buildingEntire building and appropriate outside distance
Expansion based on radiological monitoring
100 µSv/h dose rate at 1mWherever these levels are measured