本帖最后由 joyjoyjoyjoy 于 2015-1-17 20:18 编辑
不必人云亦云,忽忧圈钱的!
氡气很难从地库地下的土壤里钻进室内。
而且华人的快速现场测量方法100%不准,纯忽忧!
How to Test for Radon? http://www.hc-sc.gc.ca/ewh-semt/radiation/radon/testing-analyse-eng.php Radon testing is relatively simple and inexpensive. Radon test devices canbe purchased by phone or over the internet and are available at some homeimprovement retailers across Canada. For more information on do- it-yourselfradon test kits contact Health Canada's Radiation Protection Bureau at [email protected]or 613-946-6384. You can also hire a certified radon measurement professional to come andtest your home. Health Canada recognizes the Canadian certification program, http://file:///C:\\DOCUME~1\\ADMINI~1\\LOCALS~1\\Temp\\msohtmlclip1\\01\\clip_image001.gif http://www.c-nrpp.ca/CanadianNational Radon Proficiency Program[/url] (C-NRPP) 1-855-722-6777.Lists of certified Canadian measurement and mitigation professionals areavailable through the http://file:///C:\\DOCUME~1\\ADMINI~1\\LOCALS~1\\Temp\\msohtmlclip1\\01\\clip_image001.gif http://www.c-nrpp.ca/CanadianNational Radon Proficiency Program[/url]. http://file:///C:\\DOCUME~1\\ADMINI~1\\LOCALS~1\\Temp\\msohtmlclip1\\01\\clip_image002.jpg
The most popular long term radon detectors are the electret ion chamberand the alpha track detector. These devices areexposed to the air in a home for a specified period of time, and then sent to alaboratory for analysis. Radon is measured in units called"becquerels per cubic meter" (Bq/m?). It is not uncommon to see radonlevels in a house change by a factor of two to three or more over a one-dayperiod. Seasonal variations can be even more dramatic with the highest levelsusually experienced during the fall and winter months when air circulation andventilation is decreased. Since the radon concentration inside a home varies overtime, measurements gathered over a longer period of time are generallyconsidered to give a more accurate picture of the radon exposure. Health Canadarecommends that homes be tested for a minimum of three months, ideally duringthe winter months as the radon concentrations are usually representative atthis time. When conducting the radon test yourself observe the manufacturer'sinstructions and the guidelines below when placing a radon detector in yourhome: http://file:///C:\\DOCUME~1\\ADMINI~1\\LOCALS~1\\Temp\\msohtmlclip1\\01\\clip_image003.gif
- Make the measurement in the lowest lived-in area of your home. By lived-in we mean; where you or a member of your family spends more than 4 hours per day in that area.
- Avoid taking measurements in the kitchen. The exhaust fan as well as humidity and airborne particles from cooking may affect the accuracy of some types of radon detectors. Also, avoid bathrooms since relatively little time is spent in this room.
- Place the detector where it will not be disturbed during the measurement period but avoid small enclosed areas, such as a cupboard or closet.
- Do not place the detector close to an outside wall or near a sump or floor drain.
- Avoid locating the detector in drafts from heating or air conditioning vents, near windows or doors, or sources of heat, such as stoves, fireplaces or strong sunlight.
- Place the detector a minimum of 50cm from any floor, wall or ceiling and more than 20cm from other objects.
Health Canada has developed standard protocols for radon http://www.hc-sc.gc.ca/ewh-semt/pubs/radiation/radon_homes-maisons/index-eng.phptesting in homes[/url], http://www.hc-sc.gc.ca/ewh-semt/pubs/radiation/radon_building-edifices/index-eng.phpschools and other large buildings[/url]. Theseprotocols provide detailed instructions and guidance to radon testing companiesand homeowners on how to perform a radon test. Health Canada recommends thathomes be tested for a minimum of three months, ideally in the fall / wintertimeframe. The cost of radon testing is approximately$50 to $100. As part of the National Radon Program, Health Canada has completed a http://www.hc-sc.gc.ca/ewh-semt/pubs/radiation/survey-sondage/index-eng.phpCross-Canada residential radon survey[/url] in aneffort to gain a better understanding of radon concentrations in homes acrossCanada. |