[SC DOC]

Its been a while since I studied nuclear physics, but I think even highly enriched weapons grade Uranium 235 needs about 15 Kg. in a spherical configuration for a fissionable reaction to take place. Unless the 2.5lb. of uranium is being bombarded with neutrons from an external source, I think it would be unlikely to harm those handling it, unless it was breathed as dust.

[Rebelbase]

"highly enriched weapons grade Uranium 235 needs about 15 Kg. in a spherical configuration for a fissionable reaction to take place. "

I don't know the specifics, but a kilo of this stuff would, in my best judgement, make a dandy little "dirty bomb".