In article

,
Orval Fairbairn wrote:

One factor overlooked in all this discussion is that nuclear weapons, in
addition to generating lots of detectable radiation, get HOT! In FBM
tests we installed heaters to simulate the heat generated by a snoutful
of physics packages.

A good terrorist would have to wrap the whole thing in a lead vessel,
adding a lot of weight and then have to try to keep it cool. I know that
DC has radiation detectors spread all over the city; I assume that NYC
and Boston would, also,

It ain't as simple as it seems!

But it also ain't hard. Once you have one, you just need to get it into
the city for a minute or so, especially since we can assume a
hand-carried and detonated device.

I wouldn't bet that someone could get one into NYC at ground level, but
there are other ways.

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