Lung Tumors following Low-level Radon Exposure at Different Exposure Rates

Purpose: To study lung cancer risks under conditions simulating the situation in mines and highly exposed homes. Status: 1996-2002, data in ERA. Treatment: Inhalation of radon (0.1-0.3 μm AMAD 6.2% unattached) daily exposure for 6 hours 5 times per week as indicated under experimental groups. Endpoints: Life-span study (spontaneous death, some animals sacrificed) with macroscopic/microscopic pathology of the lung. Animal: Male Sprague-Dawley rats of different ages