Jisho

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Expressions (phrases, clauses, etc.), Noun
1. dirty bomb; radiological dispersal device
Wikipedia definition
2. Dirty bombA dirty bomb is a speculative radiological weapon that combines radioactive material with conventional explosives. The purpose of the weapon is to contaminate the area around the explosion with radioactive material, hence the attribute "dirty". Though a radiological dispersal device (RDD) would be designed to disperse radioactive material over a large area, a bomb that uses conventional explosives would likely have far more lethal effect than the radioactive material.
Read “Dirty bomb” on English Wikipedia
Read “汚い爆弾” on Japanese Wikipedia
Read “Dirty bomb” on DBpedia

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