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substances. some of them are highly radioactive, some of them aren t, some have a long shelf life, some of them don t. a lot of it being used in industry and medicine. amongst all that, only a few lend themselves to use in a terrorist attack, and cobalt 60 is at the top of the list because it is so deadly. bill: how much do you need of this, jim, to be effect be i have in order to concern effective in order to build well, you know, that s a great question. and and i think you need to góç back to the origin of the concept of terrorism. what is terrorism about? it s not so much about killing large numbers of people, although that happens, as much as it is about causing terror, the psychological state of terror. so for dirty bombs i think people sort of confuse them with nuclear bombs. a dirty bomb if it were ever to go off, more people would be killed by the conventional explosive than by the radiation. they ll be killed by the bomb, not the dirty part of the bomb. the stuff gets s

September 11thShelf lifeAren tCobalt 60Jim walshUgà ÃDirty bomb