Preventing nuclear terrorism

 
The television drama 24 is currently portraying one of the most frightening and dangerous terrorist scenarios possible--an anti-American terrorist group with radioactive fissile materials intent on detonating a "dirty bomb" in New York City to render it uninhabitable for decades to come.  Paul Walker, the director of the Security and Sustainability program at Global Green USA, explains why the basic theme of this terrorist scenario is very real. 
Bulletin of the Atomic Scientists