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No. Plutonium-239, for example, is primarily an alpha emitter, and because alpha particles are charged and massive, they're very easily blocked. So it's far from trivial to detect from outside whether a cardboard box has plutonium in it. You'd have to open the box, or probe it with X-rays or some other radiation of your own. Can't do that from three hundred miles up.

So you think that it's possible to hide a nuke in a cardboard box? Then it's certainly only a matter of time.
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