[philman_36]

And how do you know that the Russian BP nukes use a Beryllium trigger? Could you give some insight? Could the trigger be something else?
Your reply 97 concerns Little Boy. How does that make it relevant to BP nukes?
You just raise more questions in my mind.

[Southack]

All neutron initiator sources have a shelf-life, because all such radioactive sources decay.

Slower decaying substances (i.e. longer shelf-life) are available, but then they may not emit neutrons fast-enough to avoid a fizzle.

Believe it or not, TIMING is critical if you want anything more than a poisonous dirty bomb.