No, I mean some nuclear reactions produce positrons, which are a part of antimatter (anti-protons and regular neutrons make up the rest of it), and I have to wonder if there are any nukes that use that to cause massive explosions, because antimatter produces some huge explosions when it comes in contact with regular matter.
Now that I think about it, probably not. Antimatter is the most expensive substance in existence, but the head of a pin's worth of antimatter could take Rhode Island off the map. But there's a lot of atoms in the head of a pin, and most nuclear reactions that produce positrons only produce one. You'd really have to hate someone to blow up even the smallest nation on our map, (even though we seem to have infinite money) it'd cost a few times Earth's (or Anagea's) pooled value to afford such a weapon.