[ RadSafe ] N. American Residential Lung Cancer Study

[niton at mchsi.com]

It meant only 10 years of the total window examined had a radon measurement 
assocaited with it. The area of the home with the greatest radon gas variation 
is the basement (see paper below).  Studies have not noted higher 
concentrations of radon gas near the walls.  Perhaps thoron, but not radon 
gas.   

The North American Pooling did not use retrospective radon detectors.  Please 
contact me at bill-field at uiowa.edu for follow-up questions on that detector.  
See also -

Field RW, Steck DJ, Parkhurst MA, Hahaffey JA, Alavanja MCR. Intercomparison of 
Retrospective Radon Progeny Measurement Devices, Environmental Health 
Perspectives 107:905-910, 1999.

Fisher EF, Field RW, Smith BJ, Lynch CF, Steck DJ, Neuberger JS. Spatial 
Variation of Residential Radon Concentrations: The Iowa Radon Lung Cancer 
Study, Health Physics 75(5):506-513, 1998. 

Other papers related to the Iowa Study - 

 http://www.cheec.uiowa.edu/misc/radon.html