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Much of the auxiliary information presented on this site is available only as pdf documents. To take full advantage of all the great information you will need a pdf reader. If you don't have one, please download adobe reader here. It is safe, free, and extremely useful.
The IEMA DNS Radon Program has collected and analyzed all the data taken by measurement professionals from 2003 on. This is a fascinating study of their findings and is not overly technical reading. "A Status Report for Radon in Illinois, 2006"

AARST has compiled a list of epidemiological studies, complete with synopsis and links to the full text of the studies. You can find these studies from their website.
Exposure to Residential Radon and Lung Cancer in Spain:
A Population-based Case-Control Study Juan Miguel Barros-Dios, María Amparo Barreiro, Alberto Ruano-Ravina, and Adolfo Figueiras (May 2002) Iowa
Residential Radon Lung Cancer Study
American Journal of Epidemiology, 151(11): 1091-1102, (2000)
“UI Study Finds Residential Radon Exposure Poses a Significant Lung Cancer Risk”
Radiation Risk To Low Fluences of Alpha Particles May Be Greater Than We Thought
Center for Radiological Research, College of Physicians and Surgeons and Environmental Health Sciences, School of Public Health, Columbia University August 2001
Residential Radon Exposure and Lung Cancer: Variation in Risk Estimates Using Alternative Exposure Scenarios
Journal of Exposure Analysis and Environmental Epidemiology 12, 197-203 (2002)A Review of Residential Radon Case-Control Epidemiologic Studies Performed in the United States
College of Public Health, Dept. of Epidemiology, University of Iowa (2001)
Doses to Organs and Tissues From Radon and its Decay Products
UK National Radiological Protection Board, Published in Journal of Radiological Protection (2002)
Topics Under Debate: Does Exposure to Residential Radon Increase the Risk of Lung Cancer?
Radiation Protection Dosimetry, Vol. 95, No. 1, pg. 75-81 (2001)
ATSDR Radon Toxicity -Case Studies in Environmental Medicine Course
U.S. Dept. of Health & Human Services, Agency for Toxic Substances and Disease Registry
Division of Health Education & Promotion, June 2000
Induction of a Bystander Mutagenic Effect of Alpha Particles in Mammalian Cells
Center for Radiological Research, College of Physicians and Surgeons and Environmental Health Sciences, School of Public Health, Columbia University October 1, 1999
1998 National Academy of Sciences- Biological Effects of Ionizing Radiation (BEIR) VI Report: “The Health Effects of Exposure to Indoor Radon”
Targeted Cytoplasmic Irradiation With Alpha particles Induces Mutations in Mammalian Cells
Center for Radiological Research, College of Physicians and Surgeons and Environmental Health Sciences, School of Public Health, Columbia University January 21, 1999
Radon Occurrence and Health Risk Frequently Asked Questions by R. William Field, PHD (June 1999)
National Radon Results: 1985-1999
Gregory, Jalbert, U.S. Environmental Protection Agency (2002)
Smokers Most at Risk from Radon Gas in European Homes
From Environmental News Service, Jan. 3, 2005: Effect of Radon Gas on Smokers Discussed)
