  t-check/hiroshima-and-nagasaki-hit- by-nuclear-bombs-in-1945-radiation- dissipated-idusl1n3a9220/ "rate of decay is inversely proportional to half life, so something with a long half life, its not very radioactive" makes sense to me. which means, in order to be destructively radioactive, one has to use something with a short half life period.   e-131 8 days? still enough to poison the shit out of clay. it's not just a "few hours". also, there are other isotopes that will live long enough to affect people for 30 years. maybe not much after that, it's a whole life still.
European