[Shryke]

Think about that scenario (gun-type fission weapon). Not only does that require some fancy equipment (albeit nothing like a fusion weapon), but the dropper is going to be moving around a rather lethal amount of nuclear material. Unless these guys build a shield for the core, which would make it quite large, you are going to basically have a bomb that will kill its handlers in short order. But I am just theorizing. Let me ping some people for input.

[PatrickHenry]

You gotta look at the bright side of things. The blast will likely go off in a blue state. Because of the catastrophic loss of life, they'll lose at least one House member after the following census. We'll solidify our control of Congress.

(Or maybe I've been freeping too long.}

[Dan Evans]

Unless these guys build a shield for the core, which would make it quite large, you are going to basically have a bomb that will kill its handlers in short order

Most fissionable material is not dangerously radioactive. The exception is U-233.