National Council on Radiation Protection and Measurements (NCRP)
Radiation Protection Guidelines: Control of Radiation Dose in the Control Zones
1 This recommendation applies only to the early phase of the emergency response when lifesaving or other critical actions may be underway within or near (but outside) the inner perimeter. If the cumulative absorbed dose from activities within the inner and outer perimeters reaches 50 rad (0.5 Gy), a similar decision should be made on whether to remove a responder from within the outer perimeter (or to a low radiation exposure location within the outer perimeter).
2 This cumulative absorbed dose guideline also applies in those rare circumstances when medical staff members are attending to a victim in a lifesaving situation (e.g., the surgical removal of embedded radioactive shrapnel with a very high level of radioactivity.)
4 This guidance is discussed in further detail in Management of Terrorist Events Involving Radioactive Material (NCRP Report No. 138), National Council on Radiation Protection and Measurements, Bethesda, MD, 2001.
5 The cumulative absorbed dose or exposure received by an emergency responder while working outside but near the inner perimeter should be estimated, either from a personal radiation dosimeter worn by the responder or from information on exposure rates and stay times at the locations near the inner perimeter at which the responder worked.
Guidance adapted from: