You wouldn't expect significant radiological contamination from bombing an HEU facility deep underground? This isn't like exposed reactor core material.
They do have reactors though, do they not? Hitting the spent fuel pools and/or the reactors would produce detectable radioactive contamination. The HEU? Not so much as its half-life is 700 million years, and the stuff is dense and will quickly settle down.
Why would they not have reactors? Plutonium bombs are more efficient than uranium bombs, so of course they should want to make some plutonium. Remember, they claim they need HEU for civilian reactors.
For sure, but a) they have a civilian reactor program, which surely produces spent fuel, and if they run it with HEU then they probably have breeders, and they might think they can figure out how to make Pu bombs. After all, the W88 bomb design got leaked in the 90s, remember?
With a half-life between 700 million years (for U-235) and 4 billion years (for U-238). And it's dense stuff that will immediately settle on the ground. You're not going to detect it from afar.
