The plasma grenade is a magnetically-sealed plasma delivery unit, with detonating explosives, creating a large blast of green superheated plasma on detonation, with a high chance to cripple limbs. A critical hit will reduce the target to green goo, even though thrown grenade criticals deal no extra damage. It seems to have the same blast radius as its less powerful variant, the frag grenade.
xbox360 A glitch will sometimes occur that will cause an unlimited amount of plasma grenades to be thrown regulary, but to be reloaded like a 10mm pistol, unequiping it will cause this glitch to stop. It can only be thrown outside of vats in this case. [verified]