As an aid to the reader, a Glossary of Terms is provided in the beginning of this document. There is a variety of potential terrorist incidents involving radiation that could result in mass casualties that could present at hospitals in the area near the incident. The following are meant to be examples of possible radiological scenarios and are sorted in ascending order of potential health effects: (1) Radiation Dispersal Device: A conventional explosion has scattered radioactive material ("dirty bomb"), saboteurs blew up a truck carrying radioactive material, or an aerosol containing radioactive material has been spread over a large area. There may be tens to hundreds of injured people, and many hundreds of contaminated or exposed people. However, the radiation levels are not sufficient to cause acute radiation sickness in anyone; rather there are immediate psychological effects and an additional risk of long-term health effects. (2) Major event at or near a nuclear facility (such as an airplane crash into a nuclear power plant or spent nuclear fuel pool): Significant amounts of radioactive material have been released. There are dozens of injured people at the facility, many experiencing symptoms related to acute radiation syndrome, and thousands of contaminated or exposed people in the surrounding area who have an increased probability of long-term health effects. (3) Nuclear detonation: The immediate physical devastation could appear similar to that of the World Trade Center following the events of September 11, 2001. However, the dust and debris from this event will be highly radioactive. There are thousands of people both contaminated and injured at the scene. In addition, there will be thousands of people in a large area potentially extending many miles outward from the initial point of attack with serious radiation exposures although they may have no obvious physical injury or contamination. Radioactive fallout with potential for long-term health effects will extend over a large region far from ground zero. There would likely be many persons experiencing symptoms related to acute radiation syndrome