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Survival of Sprague Dawley rats inhaling natural uranium ore dust aerosol for 4.2 h/day, 5 days/week for 65 weeks. The figure shows survival of two separate groups of animals inhaling ore dust aerosol at 15 mg/m3 in air (22 malignant tumors total/126 rats total) and the control group (one malignant tumor/63 rats) treated in the same way without the ore dust aerosol. A nose-only inhalation system was used. Data from Mitchel et al. (1999).
