 |
Topics |
 |
|
Communications
Demographics
Education
Environment
Housing
Labor
Quality of Life
Transportation
Weather
|
|
|
| Radon
|
Radon Potential Index
Scientific studies have shown that Radon gas is a known human lung carcinogen.
Prolonged exposure to high levels of Radon gas can cause lung cancer. Millions
of homes and buildings contain high levels of radon gas. The Radon Potential
Index is a result of the combined efforts of the USGS and EPA to ascertain a
radon potential for the US. Important, this index should be used only as
a guide. The only real way in knowing if a home or area has unhealthy levels of
radon is specific testing. The following is a brief summary of the study
performed by the USGS on behalf of the EPA.
Background Information
Uranium: The Source
To understand radon gas - where it forms, how it forms, how it moves - we have
to start with its ultimate source, uranium. All rocks contain some uranium,
although most contain just a small amount - between 1 and 3 parts per million
(ppm) of uranium. To illustrate, fig. 1 (below) shows the concentration of uranium in ppm at the
county level in the US.
The higher the uranium level is in an area, the greater the chances are that
houses in the area have high levels of indoor radon. But studies have shown
some houses in areas with lots of uranium in the soil have low levels of indoor
radon, and other houses on uranium-poor soils have high levels of indoor radon.
Clearly, the amount of radon in a house is affected by factors in addition to
the presence of uranium in the underlying soil.
Other Factors
Some of those factors are the geology of the area, type of soil, moisture
content, and home construction. For example, homes with basements tend to have
a higher probability of radon gas exposure then those with a slab foundation.
However, even these factors do not totally explain the levels of radon in all
homes. Therefore, only testing can provide the truest measure.
Radon Potential Index
The index was constructed by weighting the above mentioned factors and
then summarizing the result. Figure 2 (below) shows the index scores for the region your city
of interest falls within. The dark purple areas have the highest risk.
More Information
More information about radon can be found by visiting the EPA's
Radon Home Page.
|
Disclaimer: This page contains information from sources which ERsys.com
does not control. If this page contains materials that are copyrighted or otherwise protected,
please contact ERsys.com immediately. Copyright © 2000-2001 ERsys.com, All
Rights Reserved.
|
|
|
|
