A "dirty bomb" refers to a type of bomb that combines traditional explosives with radioactive materials. When it detonates, it spreads radioactive substances, causing fear, pollution, and potential health risks. Full definition
Let's start with dirty bombs, a staple of media - fed fears. (discovermagazine.com)
In between the talk of Dirty Bomb in the Splash Damage section was this sentence: (gamewatcher.com)
The FBI and Darwyn move to intercept the cell's plans to detonate a pair of nuclear dirty bombs in Los Angeles on the Fourth of July, but their victory is overshadowed by a pair of tragedies for Darwyn. (sho.com)