From New Scientist:A dirty bomb attack on the US would find the country ill-prepared to clean up the resulting radioactive mess, a government watchdog has warned – and hasty attempts at cleaning up could make things worse.
Building a true nuclear bomb requires expert knowledge and possession of plutonium or enriched uranium, which governments keep under tight security. But more widely available radioactive materials, intended for applications such as medical imaging, could be used to construct a "dirty bomb" detonated a conventional explosives such as dynamite.
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