dirty bomb 
noun
A conventional bomb that contains radioactive material.He also told of a trip to Africa to buy radioactive materials for a dirty bomb from renegade Russians....
- They fear a hijacked oil tanker could be rigged with explosives or a radioactive dirty bomb could be smuggled ashore in a shipping container.
- They'll just get the weapons in anyhow, dirty bombs, clean bombs, or blow up one of the 103 nuclear power plants in America.
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