I'm happy to report that the couple thousand bucks I spent on the crawlspace insulation and air sealing seemed to have made a huge dent in the radon problem in the house. By EPA standards, trying to get to below 4.0 for the living level. The actual level inside didn't change by a huge amount, but you can see the source levels in the crawlspace dropped from 27 or 37 down to 6.6. I'm still a bit surprised that it's even this high, but am happy with the results.
Each time I tested the same two locations: the lower level family room (living area) and the crawlspace (unoccupied). The results in picocuries per liter (pCi/l) were:
July 08 (Kidde brand): 2.7 family room, 6.6 crawlspace
January 08 - CRAWL SPACE INSULATION AND SEALING
April 07 (Kidde brand): 4.8 family room, 37.5 crawlspace
Feb 07 (Accu-Star brand): 3.6 family room, 27 crawlspace
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