Nuclear damage is inflicted when a monster is exposed to high-energy particles which emit sufficient radiation to break atomic bonds. Nuclear damage is very difficult to resist by physical means. Some Kaiju are themselves the result of unchecked nuclear absorption, which provides them with a natural (or unnatural) resistance to radiation. Some robotic Kaiju are nearly immune to low-level radiation environments, since they have no organic elements. But high levels of radioactive energy are still quite effective against them! Organic Kaiju with quick metabolisms are especially susceptible to radioactive damage.