There’s also just the fact that “weapons grade” just means it’s useful for a fission weapon. Nothing’s stopping you from taking that cobalt-60 you found in that Therac at Daryl’s junkyard, strapping it to an IED, and using that as a dispersal device to give a lot of people radiation poisoning or whatever (the traditional “dirty bomb”).
There’s also just the fact that “weapons grade” just means it’s useful for a fission weapon. Nothing’s stopping you from taking that cobalt-60 you found in that Therac at Daryl’s junkyard, strapping it to an IED, and using that as a dispersal device to give a lot of people radiation poisoning or whatever (the traditional “dirty bomb”).