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Radon gas levels are measured in a unit called the becquerel (Bq). One becquerel is described as one event of radiation emission per second. It is an extremely small unit. The old Canadian standard considered 800 Bq per cubic metre to be an acceptable level.
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www.cbc.ca/news/background/health/radon.html
www.cbc.ca/news/background/health/radon.html
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A maximum acceptable concentration (MAC) for radon in drinking water has not been established. ... In general, the average radon level in outdoor air for continental locations in temperate latitudes is about 9 Bq/m3.2,13 Enhanced levels will be found in the vicinity of uranium mines and mill and tailings operations.10...
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www.hc-sc.gc.ca/ewh-semt/pubs/water-eau/radon/index-eng...
www.hc-sc.gc.ca/ewh-semt/pubs/water-eau/radon/index-eng.php
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In 2007 the government moved the acceptable level of radon in buildings from 800 Bq per cubic metre to 200 Bq per cubic metre. The move came after a joint federal-provincial committee recommendation the change based on risk assessments at the time.
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ca.news.yahoo.com/s/cbc/091217/science/canada_ott_radon...
ca.news.yahoo.com/s/cbc/091217/science/canada_ott_radon_removal
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In 1986, the U.S. EPA issued a guideline for radon exposure for the general public. EPA has set the maximum acceptable level for constant exposure at 4.0 pCi/L (i.e., ... Radon gas levels in the tank room air were reduced from 250 pCi/L to 25-40 pCi/L, which meets the Federal Occupations Health (FEOH) guideline of (1) WLM/yr.
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www.fws.gov/ennis/investigations/Radon%20Gas%20and%20it...
www.fws.gov/ennis/investigations/Radon%20Gas%20and%20its%20Removal%20at%20the%20Ennis%20National%20Fish%20Hatcher.pdf
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amount of radon at background levels is acceptable is problematic in light of .... Radon in Drinking Water Health Risk Reduction and Cost Analysis. Federal ...
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www.maine.gov/dhhs/eohp/wells/documents/radonMEG.pdf
www.maine.gov/dhhs/eohp/wells/documents/radonMEG.pdf
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Unlike radon in air the federal government has not determined a maximum acceptable level for radon in water. When we measure radon in air it is capturing a representative sample of the air that is present at the time of the test.
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www.inquiring-eye.com/resources/radon.htm
www.inquiring-eye.com/resources/radon.htm
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When purchasing a radon detection kit, you should examine the package for indications that the kit has been approved by federal or state health, environmental protection, or consumer protection agencies. ... What is an acceptable level of indoor radon?
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webapp.dpor.state.va.us/articles/radon.htm
webapp.dpor.state.va.us/articles/radon.htm
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Fix your home if your radon level is 4 picocuries per liter (pCi/L) or higher. ... Radon reduction systems work and they are not too costly. Some radon reduction systems can reduce radon levels in your home by up to 99%. Even very high levels can be reduced to acceptable levels.
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www.epa.gov/radon/pubs/citguide.html
www.epa.gov/radon/pubs/citguide.html
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Also, for non-DOE federal facilities, ... The ANSI/HPS N13.1-1999 standard includes the following features: . Criteria for determining suitability of a sampling location based on the uniformity of the velocity and contaminant concentration profiles, . A criterion for an acceptable level of flow swirl, . A maximum relative...
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www.epa.gov/EPA-AIR/2002/September/Day-09/a22361.htm
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