re: #411 Teukka

For a gun-type bomb, you need a lot more fissile material than for an implosion bomb. I’ve heard figures in the range of 28 to 64 kg of HEU. Pu is not possible to use because it’s too reactive.
For a implosion bomb however, you really don’t need that much, a 6.2-kilogram (14 lb) sphere of Pu and probably a similar mass of HEU is enough to make a nice big bang.

Further reading:
o Demon Core
o Gun-Type Weapon
o Nuclear Weapon Design

No question of that. None of them are possible to make with only 10g of HEU. That’s an amount only useful for scientific research.