A new factsheet from the National Academies and the U.S. Department of Homeland Security offers clear, objective information on "dirty bombs" and other devices that could be used in a radiological terrorist attack.
This was created for journalists participating in the Academies' News
and Terrorism: Communicating in a Crisis workshops.
Factsheet: Radiological Attack

http://nae.edu/NAE/pubundcom.nsf/weblinks/CGOZ-646NVG/$file/radiological%20attack.pdf