[King Prout]

such a small sub-critical-mass warhead requires neutron-enriching detonators composed of one of a few radioisotypes, all of which are remarkably difficult to produce (not "refine" but PRODUCE) and all of which have a useful shelf-life of less than a year.

[HardStarboard]

>>> .....difficult to produce (not "refine" but PRODUCE) and all of which have a useful shelf-life of less than a year.<<<

I read some of the stuff that has been circulated on the viability of these devices (or not)....your answer sounds as authorititave, reasonable and concise as any I have heard.

Thanks.....