Suggested radius of inner
cordoned area (safety perimeter) for a
radiological emergency
| Situation | Initial inner cordoned area (safety perimeter) |
|---|
| Initial determination — outside |
|---|
| Unshielded or damaged potentially dangerous source | 30m around |
| Major spill from a potentially dangerous source | 100m around |
| Fire, explosion or fumes involving a potentially dangerous source | 300m radius |
| Suspected bomb (potential RDD) exploded or unexploded
| 400m radius or more to protect against an explosion |
| Initial determination — inside a building |
|---|
| Damage, loss of shielding or spill involving a potentially dangerous source | Affected and adjacent areas, (including floors above and below) |
| Fires or other event involving a potentially dangerous source that can spread
materials throughout the building (e.g. through the ventilation system)
| Entire building and appropriate outside distance as indicated above |
| Expansion based on radiological monitoring |
|---|
| Ambient dose rate of 100 µSv/h | Wherever these levels are measured |
