Source: Musolino SV, Harper FT, Buddemeier B, Brown M, Schlueck R. Updated Emergency Response Guidance for the First 48 H after the Outdoor Detonation of an Explosive Radiological Dispersal Device. Health Phys 2013;105(1);65-73, Figure 2.
"Notional representation of dispersal possibilities. One or more of these fates is possible depending on the form of the radioactive material and the design of the device. Note: These patterns are representative only of the behavior of the radioactive material in the device. Chunks of non-radioactive debris could fall beyond the indicated range for ballistic fragments."