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Definition of Radiation Area Boundaries for Responding to a Radiological Dispersal Device (RDD)
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Zones defined by CRCPD

Adapted from Handbook for Responding to a Radiological Dispersal Device (Dirty Bomb): First Responder's Guide: The First 12 Hours (CRCPD Publication 06-6) Conference of Radiation Control Program Directors, Inc. Frankfort, Kentucky, 2006.