>>5
I saw that article. It has to be a joke.

1, there isn't 740 grams of purified polonium 210 on Earth. There might not be 740 grams of polonium 210 in the Solar System.

2, the radiation emitted by its power source would kill a soldier carrying it in a matter of days, sooner if a bullet or shell fragment strikes the casing and lets the polonium leak out.

If by some bizarre and implausible means you got a hundred thousand such rifles--I don't know where they could come from, maybe from aliens? maybe from the replicators on the Enterprise? this is just for the sake of argument--the single most effective military use for them would be to give them to your enemies. They'd be a hell of a lot more dangerous to the soldiers using them than to the people they were trying to kill with them.