Radioactive round deals average explosive damage but has a small ( Small compared to the particle effect so don't let it fool you ) AOE effect on impact that gives similar effect to nerve gas. Except much more powerfull and also flashes your screen white making it a nightmare to aim and even play with once you're infected. And you cannot be revived if hit by one too so no defib ( Didn't test if tactical still work tough ).
The radioactive effect last very long too. About 800 hp.