Interestingly, radon gas is more rare in moist soil. See http://energy.cr.usgs.gov/radon/georadon/3.html So, I suspect that with our ever-moisture-ridden basement, the radon level is probably pretty low. > From: http://dummy.us.eu.org/robert (robert) > Date: Sun, 6 Jul 2003 17:30:35 -0400 > > I was reading on a web site that the average is about $2000. They gave a > low value of $800, so I suspect that the standard deviation is probably > $600, which means that the most likely range is $800 to $3200. (See > http://www.infiltec.com/inf-catr.htm and http://www.neradon.com/faq.htm .)