The Afghans are great entrepreneurs in this kind of thing. They were always trying to sell us some cobbled-up thing with a hammer and sickle and an international ionizing radiation symbol as leftover Soviet nuke stuff (in fact, the Sovs never brought nukes into Afghanistan. They were evil, not stupid).
After a while it began to sink in that we had better physics educations than they did, so they actually brought in one that sent a Geiger counter off. Turns out that some enterprising fellow had jimmied the Caesium 137 out of an abandoned machine in a shell-wracked hospital. The builder of this thing almost certainly died for his pains, and we didn't pay for the cylinder, either... but al-Qaeda might have gone for something like that.
Unfortunately, as long as mosques and charities continue to support terrorists financially, they will have the wherewithal to buy this kind of thing, and they will gradually get more informed. Like the Soviets were, they are evil, and they suffer from the anti-intellectualism of their goatherders' religion, but they are not stupid.
d.o.l.
Criminal Number 18F