Front Matter -- Preface -- Contents -- Public Summary -- Executive Summary -- 1 Introduction -- 2 Baseline Information on Indoor Radon and Radon in Water in the United States -- 3 Transfer of Radon from Water to Indoor Air -- 4 Dosimetry of Ingested Radon and its Associated Risk -- 5 Dosimetry of Inhaled Radon and its Associated Risk -- 6 Molecular and Cellular Mechanisms of Radon-Induced Carcinogenesis -- 7 Defining Key Variabilities and Uncertainties -- 8 Mitigation -- 9 Multimedia Approach to Risk Reduction -- 10 Research Recommendations -- References -- Glossary -- A Behavior of Radon and its Decay Product in the Body -- B A Model for Diffusion of Radon Through the Stomach Wall -- C Water-Mitigation Techniques -- D Risks Associated with Disinfection By-products Formed by Water Chlorination Related to Trihalomethanes (THMs) -- E Gamma Radiation Dose From Granular-Activated Carbon (GAC) Water Treatment Units -- F EPA Approach to Analyzing Uncertainty and Variability -- Index.