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- Newsgroups: sci.physics
- Path: sparky!uunet!pmafire!russ
- From: russ@pmafire.inel.gov (Russ Brown)
- Message-ID: <1992Aug28.155159.7355@pmafire.inel.gov>
- Date: Fri, 28 Aug 92 15:51:59 GMT
- Organization: WINCO
- Subject: Re: Concern over radon levels?
- Summary:
- References: <geavdWa00WBNQ4_29l@andrew.cmu.edu>
- Followup-To:
- Organization: WINCO
- Keywords:
- Lines: 64
-
- In article <geavdWa00WBNQ4_29l@andrew.cmu.edu> jw54+@andrew.cmu.edu (Jonathan Wickert) writes:
- >
- >
- >I'm in the process of buying a house in southwestern Pennsylvania. As
- >part of the home inspection, I had a radon test done by one of these
- >companies that does radon testing for a living. It involved placing two
- >canisters in the basement, and one in the living room. The canisters
- >are removed after 3 days of exposure, and then sent to a central state
- >licensed lab.
- >
- >The test revealed levels of 4.2, 5.5, and 7.6 picocuries/liter in the
- >areas tested. According to guidelines established by the EPA and the
- >Center for Disease Control, a continuous exposure of 4 pCi/l is used as
- >a guideline to indicate when some corrective action should be taken.
- >
- >My questions are
- >
- >1. Are these levels sufficently high to be of concern?
- >2. How common is it to have such radon levels in this geographical area?
- >
-
- 1. 4 pCi/litre roughly equivalent to about a 1600 mrem/yr lung dose or a
- 200 mrem/yr whole body dose (effective dose equivalent). So, in a
- sense, the answer to your question would be a qualified "yes".
-
- The risk for several populations of miners exposed to high
- concentrations of radon (really the radon daughters) appeared to be
- significant when cumulative exposure exceeds 100 WLM (4 pCi/l= 1
- WLM).
-
- However, if you don't smoke and don't live in the basement full-time,
- your risk shouldn't vary much from national averages.
-
- An EPA survey of 17 states listed a low of 1.6 pCi/l in Arizona to a
- high of 7.0 pCi/l in North Dakota. Just to confuse things, a quick
- look at national lung cancer mortality statistics for the last 40 years
- shows that:
-
- U.S. mortality (whites): 33.3 per 100,000 per year
- Arizona: 34.9
- North Dakota: 21.0
-
- What this probably indicates is that the effects of the radon are not
- significant compared to other factors. Lifestyle choices may have
- the biggest effect. These data should not be interpreted to mean
- that there is a "benefit" from higher radon exposures.
-
- For more detail, read the BEIR IV report, "Health Risks of Radon and
- Other Internally Deposited Alpha-Emitters", NRC (1988).
-
- Most of the above-listed info is from rough notes or memory. If you
- want specific lung cancer mortality data, I can provide it.
-
- russ@pmafire.inel.gov
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