https://www.thehandbasket.co/p/trump-fentanyl-weapon-of-mass-destruction-executive-order-draft-scoop
Well this is absolutely frightening in so much that Trump is going to force his way into Canada via military operations by claiming fentanyl as a weapon of mass destruction.
Anyone remember the Bush Administration and WMDs they said were there but never were?
Elbows up Canuck’s. The time to prepare is most likely closer than we think.
The minimum critical mass of plutonium is around 20 pounds which is not unreasonable and being denser than lead is actually good since it allows it to be very compact
IIRC you have to factor in the explosive lenses and various neutron reflectors as well, and to get all the way to the theoretical minimum you basically need literal tons of that other stuff. Backpack/wheeled luggage/shell weight is what’s public, and seems about like about as good as you can get in practice.
There’s exotic choices of fission fuel with a smaller critical mass, but they’re also aggressively radioactive and tend to really really difficult to produce, to the point of impracticality.
Honestly briefcaseness wasn’t the main problem with OP, but it was worth commenting on.