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Course: CB/WB1585
CE Original Date: June 1, 2010
CE Renewal Date: June 1, 2012
CE Expiration Date: June 1, 2014
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Key Concepts
  • The U. S. Environmental Protection Agency estimates that indoor radon exposure may result in 21,000 lung cancer deaths annually in the United States.
  • Radon may be second only to smoking as a cause of lung cancer. Increased use of medical radiation also contributes to the annual radiation dose.
  • The combination of smoking and radon exposure results in a higher health risk.
  • Current technology can easily decrease the concentration of radon in indoor air, and radon’s associated risk for producing lung cancer.
About This and Other Case Studies in Environmental Medicine

This educational case study document is one in a series of self-instructional modules designed to increase the primary care provider’s knowledge of hazardous substances in the environment and to promote the adoption of medical practices that aid in the evaluation and care of potentially exposed patients. The complete series of Case Studies in Environmental Medicine is located on the ATSDR Web site at URL: In addition, the downloadable PDF version pdf icon[PDF – 1.05 MB] of this educational series and other environmental medicine materials provides content in an electronic, printable format, especially for those who may lack adequate Internet service.

How to Apply for and Receive Continuing Education Credit

For more information about continuing medical education credits, continuing nursing education credits, and other continuing education units as well as access to the Assessment and Posttest, please visit

For additional information about Environmental Medicine Education Products, please visit


We gratefully acknowledge the work that the medical writers, editors, and reviewers have provided to produce this educational resource. Listed below are those who have contributed to development of this version of the Case Study in Environmental Medicine.

Please Note: Each content expert for this case study has reported no conflict of interest that would bias the case study content.

CDC/ATSDR Author(s): Oscar Tarragó, MD, MPH, CHES

CDC/ATSDR Planners: Charlton Coles, Ph.D.; John Doyle, MPA; Kimberly Gehle, MD, MPH; Sharon L. Hall, Ph.D.; Michael Hatcher, DrPH; Ronald T. Jolly; Trang Nguyen, MPH; Barbara M. Riley, RN; Delene Roberts, MSA; Oscar Tarrago, MD, MPH, CHES; Brian Tencza, BS, MEd.

CDC/ATSDR Contributors: Sam Keith, MS, CHP

CDC/ATSDR External Peer Review: Jonathan M. Samet, MD, MS.; Mark Upfal, MD.

Disclaimer and Disclosure

The state of knowledge regarding the treatment of patients potentially exposed to hazardous substances in the environment is constantly evolving and is often uncertain. In developing its educational products ATSDR has made a diligent effort to ensure the accuracy and the currency of the presented information. ATSDR, however, makes no claim that the environmental medicine and health education resources discussed in these products comprehensively address all possible situations related to various substances. The products are intended for educational use to build the knowledge of physicians and other health professionals in assessing the conditions and managing the treatment of patients potentially exposed to hazardous substances. The products are not a substitute for a health-care provider’s professional judgment. Please interpret the environmental medicine and the health education resources in light of specific information regarding the patient and in conjunction with other medical authorities. Use of trade names in ATSDR products is for identification purposes only and does not imply endorsement by the Agency for Toxic Substances and Disease Registry or the U.S. Department of Health and Human Services.


In compliance with continuing education requirements, all presenters must disclose any financial or other associations with the manufacturers of commercial products, suppliers of commercial services, or commercial supporters as well as any use of unlabeled product(s) or product(s) under investigational use. CDC, our planners, and the presenters for this seminar do not have financial or other associations with the manufacturers of commercial products, suppliers of commercial services, or commercial supporters. This presentation does not involve the unlabeled use of a product or product under investigational use. There was no commercial support for this activity.

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U.S. Department of Health and Human Services
Agency for Toxic Substances and Disease Registry
Division of Toxicology and Environmental Medicine
Environmental Medicine and Educational Services Branch

Page last reviewed: December 10, 2013