A common type of RDD is what is called a “dirty bomb,” which is designed to spread radioactive material through passive (aerosol) or active (explosive) means. The latter

typically combines conventional explosives, such as dynamite, with radioactive material. The terms “dirty bomb” and “RDD” are often used interchangeably, although

the former is a much broader term. Some types of RDDs do not use explosives.

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