While debate continues with respect to exposure to very low levels of radiation, it is generally assumed that there is no threshold (the linear no threshold, ENT, assumption). The chemical toxicity of some radioactive elements (such as uranium) and of stable nuclides (e.g. lead) is also a potential source of hazard but usually to a much lesser extent than that associated with radiological characteristics. Physical hazards such as chemical reactivity, ignitability or corrosivity pose acute hazards only, although these can result in property damage, serious injury or even death if the wastes are mismanaged.