Abstract
Assessment of the chemical toxicity of long-lived radionuclides on the hasis of WHO guidelines for drinking-water quaiity. The current assessment of health risks related to long lived radionuclides waste management is not complete if accounting only for radiological toxicity aspects. Although such an approach is justified for a large number of radionuclides of concern, it nevertheless cannot be exclusive and generalised: the chemical toxicity should be considered for radionuclides with a radioactive haif-Me exceeding id years. When assessing the chemical or radiological toxicity of a radionuclide, a reference dose applicated to drinking water consumption (0.1 mSv/year) can be compared to existing toxicologid data. Such an approach has been used by the World Heaith Organization for natural uranium, for which a guideline value in drinking water derived from its chemical toxicity (2 @) is recommended. WHO'S approach is used here for illustrating that the potential chemical toxicity of an element is to be considered for assessing health risks related to long-lived radionuclides.
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