I heard the American Hiroshima argument on AM radio two weeks ago. Guess which show? Yeah, I knew you'd get it.
Anyhow, it's a load of horse manure.

Hakman (Donuel) as usual is trying to fantasize that he has a clue. Tritium is a component of advanced weapons, and was not used in the Hiroshima and Nagasaki bombs. Nevertheless, by accident he is slightly correct (the way an unwound watch is correct twice a day). Bombs need a modicum of maintenance. And although it is easy to design and build a low yield uranium device, you need a lot of uranium and it won't be a big bomb by current standards. To put together a plutonium weapon takes a lot of skill, technology, and testing.

Osama actually bringing off a nuclear attack, much as I'm sure he'd like to, is of very very low likelihood.

If you look at what this world-wide terrorist network has really been able to do over the past ten years, it seems to be diminishing in effectivenes rather than the other way round.