Re: Radon Migration Through Concrete

[William Lorenzen <LORENZEN_W@A1.TCH.Harvard.edu>]

          From my experience as a radon mitigator I do not think the major 
          source term is the concrete.  It almost always is the soil gas.
          
          Some reasons for the change might be related to:
               
               weather conditions such as BP, rain and wind
               Ventilation rate of the building (was there a change)
               type of monitoring (decay products (WLM) vs. radon (pCi/L).
               
          I would doubt that the issue is only emanation of radon from the 
          concrete.
          
          William A. Lorenzen
          EPA Listed Radon Mitigator (ID #10103)
          
          lorenzen_w@a1.tch.harvard.edu

************************************************************************
The RADSAFE Frequently Asked Questions list, archives and subscription
information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html