For information on the effectiveness of passive radon systems, I suggest contacting the Kansas Office of Radiation Control and obtaining a copy of their study which demonstrated that a passive only system on average decreases the average annual radon concentration by about one third.
Always advocate, include, or require a radon test at occupancy because passive alone may not be sufficient radon removal.
JimJames L. McNees, CHPDirector, Office of Radiation ControlAlabama Department of Public HealthOffice-334-206-5368 Fax-334-206-5387Cell- 334-850-5293--- On Tue, 4/5/11, Barn, Prabjit wrote:
From: Barn, Prabjit Subject: [RNPROF] Passive mitigation measuresTo: RADONPROFESSIONALS@LIST.UIOWA.EDUDate: Tuesday, April 5, 2011, 12:49 PM
Hello all,
I am with the British Columbia Centre for Disease Control (Vancouver, Canada). With recent proposed changes to the BC Building Code, the issue of passive pre-mitigation measures and their effectiveness in reducing radon levels in homes and buildings has come up. By passive measures, I mean gravel aggregate, vapour barriers, and sub-slab depressurization (minus active exhaust).
We are trying to understand the effectiveness of these passive measures in reducing radon levels in a home, as well as the role of different factors in determining effectiveness, including temperature, relative humidity, soil type, radon levels in a home (low versus high), surface area of ground floor (of home), etc.
I’m wondering if anyone is aware of any information on this topic, including experimental or observational studies, reviews, or anything else.
Thanks,
Prabjit
Prabjit Barn, MSc
Environmental Health Scientist
British Columbia Centre for Disease Control &
The National Collaborating Centre for Environmental Health
400 East Tower, 555 W 12th Ave,
Vancouver, BC, V5Z 3X7
prabjit.barn@bccdc.ca
T: 604-707-2463
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From Name
James McNees
From Address
mcneesj@YAHOO.COM