Radiological and Nuclear Devices
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Radiological Dispersal Devices (RDD)
An RDD is a conventional bomb not a yield-producing nuclear device. RDDs are designed to disperse radioactive material to cause destruction, contamination, and injury from the radiation produced by the material. An RDD can be almost any size, defined only by the amount of radioactive material and explosives.
A passive RDD is a system in which unshielded radioactive material is dispersed or placed manually at the target.
An explosive RDDoften called a "dirty bomb"is any system that uses the explosive force of detonation to disperse radioactive material. A simple explosive RDD consisting of a lead-shielded containercommonly called a "pig"and a kilogram of explosive attached could easily fit into a backpack.
An atmospheric RDD is any system in which radioactive material is converted into a form that is easily transported by air currents.
Use of an RDD by terrorists could result in health, environmental, and economic effects as well as political and social effects. It will cause fear, injury, and possibly lead to levels of contamination requiring costly and time-consuming cleanup efforts.
A variety of radioactive materials are commonly available and could be used in an RDD, including Cesium-137, Strontium-90, and Cobalt-60. Hospitals, universities, factories, construction companies, and laboratories are possible sources for these radioactive materials.
Improvised Nuclear Device (IND)
An IND is intended to cause a yield-producing nuclear explosion. An IND could consist of diverted nuclear weapon components, a modified nuclear weapon, or indigenous-designed device.
INDs can be categorized into two types: implosion and gun assembled. Unlike RDDs that can be made with almost any radioactive material, INDs require fissile materialhighly enriched uranium or plutoniumto produce nuclear yield.
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Online Resources
More detailed information on the medical aspects of chemical, biological, and nuclear weapons threats can be found at the following Internet sites:
The Medical NBC Information server:
www.nbc-med.org and http://www.nbc-med.org
Medical Research and Material Command:
mrmc-www.army.mil
Medical Research Institute of Chemical Defense: chemdef.apgea.army.mil
Medical Research Institute of Infectious Diseases: www.usamriid.army.mil
National Institute for Occupational Safety and Health: www.cdc.gov/niosh/topics/chemical-safety/defalt.html
US Department of Homeland Security: www.ready.gov
Central Intelligence Agency:
CBR Incident Handbook http://www.cia.gov/cia/reports/cbr_handbook/cbrbook.html
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