RADON by suchenfz


									                                RADON (Rn) GAS
Indoor Radon is the second leading cause of lung cancer in the United States and the
leading cause among non-smokers. Smoking, radon, and secondhand smoke are the
leading causes of lung cancer.

Radon is generated during radioactive decay of Radium (Ra) which in terms, originates
during radioactive decay of Uranium (U) and Thorium (Th). These radioactive elements are
usually present scattered in the Earth's crust. The Radon gas escapes through cracks in
rocks to the atmosphere. Elevated concentrations of Radon are therefore highly localized
and if one zone is affected this does not necessarily mean that neighbors would have the
same problem.

The following facts about Radon can be pointed out:

     -Radon is a tasteless, colorless, odorless gas.

     -It is a proven carcinogen and ranks second only to cigarette smoking as a cause of
     lung cancer. Smoking increases the risks caused by Radon gas.

     -There is a number of radon sampling devices that you can buy, or you can have a
     professional company conduct tests. The instructions of the manufactures of the
     testing device must be followed closely.

     -Radon is measured in pico Curies per liter (pCi/L). The EPA recommends that
     remedial action be taken when a residence exceeds a radon level of 4 pCi/L. Normal
     outside air has a content of 0.1-0.2 pCi/L. Note that the EPA tolerance for remedial
     action is not a limit for safe level. The health hazards and risks increase as
     concentration and time of exposure increase.

If you have a Radon problem, it is usually easy and inexpensive to abate. In this case it is
recommended to consult an expert. The ways Radon can enter into a house are shown
There are three main ways of reducing Radon concentrations in a building: a) Sealing the
cracks and holes in foundations where gas can ingress; b) Ventilating (without creating
vacuum) the lower level of the building in contact with the soil with fresh outside air in
order to remove it; c) Pressurization of the building in order to avoid entrance of Radon
gas into it.

EPA recommends the Standard Practice for Installing Radon Mitigation Systems in
Existing Low-Rise Residential Buildings* for residential radon mitigation. This voluntary,
consensus-based standard was developed and issued by the American Society for Testing
and Materials International, and is identified as ASTM E-2121.

A single free copy of the ASTM E-2121 standard is available from EPA’s National Service
Center for Environmental Publications:
http:/yosemite.epa.gov/ncepihom/nsCatalog.nsf/SearchPubs?OpenForm, or the Agency’s
IAQ-Info hotline, 1-800-438-4318. Copies of the standard may be purchased from ASTMI at

For more information about Radon in indoor air consult:

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