For instance, I recently watched [this](https://www.youtube.com/watch?v=uJ8cYheR5xo) video, and during it they explain that the bodies of the technicians at the SL-1 site had to be autopsied at great length from the doctors, because their bodies were still emitting extreme radioactivity.
how does radioactive material cause other, normally benign, material to take on radioactivity?
In: 90
Neutron activation. Neutrons get deposited in the nucleus of a non-radioactive isotope, and turn it into a radioactive isotope.
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