[BC] Silver soldering BRASS

[PeterH5322]

>That's also not how they separate U235 from U238 except
>in the movies.

The "active" material in most weapons is Pu 239 having no more than 4 
percent Pu 240.

The inability to remove sufficient Pu 240 from the Hanford product was 
what almost led to the abandonment of a Pu weapon altogether, save for 
the great achievement of George Kistiakowski (aided by the English, 
including the spy/traitor/defector Klaus Fuchs) of the implosion method, 
which is vastly superior to the then other extant "assembly" method, the 
so-called "gun" method.

LLNL still researches explosives for use in "lensed" and non-lensed 
implosion devices, and these materials have recently found a possible new 
use in high performance LCD displays.

(Highly enriched U 235 is sometimes found in so-called "composite pits", 
Pu 239 + U 235, for specialized weapons purposes, and partially enriched 
U 235 has a use in so-called "dial a yield" weapons, where the partially 
enriched U 235 forms the third stage in a fission-fusion-fission weapon).