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Human Health Soil Quality Guidelines Estimated Daily Intakes For the purpose of this exposure assessment, four age classes of the general population were considered: adults, teenagers, school aged children, and toddlers. Reference body weights and standard intakes of air, drinking water, and soil (including house dust) for each specified age class of the general population are presented in Table 17. The total daily uranium intake via food was calculated using food intake rates for various age groups of Canadians (Table 15) and mean concentrations for 238-uranium determined in the 2001 UK Total Diet Study (Table 7) (due to a lack of Canadian-specific data). It was assumed that the uranium concentrations determined in the UK Total Diet Study were representative of uranium levels in food in Canada. Dietary intake estimates for uranium are provided for all age groups in Table 16. SOIL QUALITY GUIDELINES SSD URANIUM Page 67 Daily intakes of uranium via air, drinking water, and soil were estimated by multiplying typical Canadian intake rates by the mean uranium concentrations occurring in the Canadian environment. In all cases, the average Canadian exposure has been estimated using uranium concentrations to which most Canadians are likely to be exposed based on the best information available at the present time. Table 17 summarizes the daily intake estimates for uranium via all media for four age classes of the Canadian general population. The estimated daily intakes (EDI) for adults, teenagers, school aged children, and toddlers were 1.6, 1.9, 1.7, and 1.3 µg U/day, respectively. Food constitutes the main source of uranium exposure, ranging from 77% (toddler, 7 months to 4 years) to 89% (teenagers, 12-19 years) of the EDI. In the case of the toddler, drinking water and soil together comprise 22% of the total uranium exposure.