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Pages 1-7

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From page 1...
... Thus, radon from water contributes to the total inhalation risk associated with radon in indoor air. In addition to this, drinking water contains dissolved radon and the radiation emitted by radon and its radioactive decay products exposes sensitive cells in the stomach as well as other organs once it is absorbed into the bloodstream.
From page 2...
... In response to that agreement, the NAS established through its principal operating agency, the National Research Council, a committee which has evaluated various issues related to the risk from radon in drinking water and provides here the information needed by EPA to set the AMCL. The primary conclusion from the committee's investigation into the risk of inhaling radon as compared to drinking water containing dissolved radon is as follows: Most of the cancer risk resulting from radon in the household water supply is due to inhalation of the radioactive by-products that are produced from radon that has been released from the water into the air, rather than from drinking the water.
From page 3...
... 3 Based on an analysis of the available data on radon concentrations outdoors and on the transfer from water to air, the Research Council committee arrived at these additional conclusions: · The average outdoor air concentration over the entire United States is about 15 becquerel per cubic meter (405 psi per cubic meter or 0.4 psi per liter)
From page 4...
... State programs may rely on a variety of mitigation measures, including public education, home radon testing, training, technical assistance, remediation grant and loan or other financial incentive programs, or other regulatory or nonregulatory measures. As required by SDWA, EPA is developing guidelines for multimedia mitigation programs.
From page 5...
... The previously conducted education and outreach programs reviewed by the committee were largely unsuccessful; therefore, the committee concluded that public education and outreach programs alone would be insufficient to achieve a measurable reduction in health risk. A multimedia mitigation program will reduce radon risks in indoor air in lieu of reduction to the MCL in drinking water.
From page 6...
... It will require significant cooperation among EPA, state agencies, water utilities and local governments, especially because many of the communities affected by the radon regulation will be very small and they will need assistance in making decisions concerning the advantages or disadvantages of a multimedia program. Thus, each public water supply will find it necessary to study its own circumstances carefully before deciding to undertake a multimedia mitigation program instead of treating the water to reduce the radon dissolved in it.
From page 7...
... 3 This report 7 INGESTION RISK drinking water with dissolved radon | | Ox ea<\'\ 9 fist\ ~\a~ Atom Ha Cater 7° < c°~" o\ 9Cooo~s Cal G3 S e \~0 3 .


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