On Wednesday, Jan 7, 2004, at 07:08 US/Pacific, Dave VanHorn wrote:

> In africa, there are several sites where at one time in the past,
> there was
> a natural reactor running. Natural concentration of uranium reached
> criticality.
>
Of course, there's a big difference between "enriched enough for a
reactor"
and "enriched enough for a bomb"...


IIRC, enriching uranium is a pretty non-trivial task.  you are talking
about atoms with no relevant chemical differences and only about 1%
mass difference...  It's perhaps not difficult as a national project,
but it seems unlikely for something as small as a "terrorist group."

BillW

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