Exposure to atmospheric radon.

@article{Steck1999ExposureTA,
  title={Exposure to atmospheric radon.},
  author={Daniel J. Steck and R. William Field and Charles F. Lynch},
  journal={Environmental Health Perspectives},
  year={1999},
  volume={107},
  pages={123 - 127}
}
We measured radon (222Rn) concentrations in Iowa and Minnesota and found that unusually high annual average radon concentrations occur outdoors in portions of central North America. In some areas, outdoor concentrations exceed the national average indoor radon concentration. The general spatial patterns of outdoor radon and indoor radon are similar to the spatial distribution of radon progeny in the soil. Outdoor radon exposure in this region can be a substantial fraction of an individual's… 

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