This local company, Homeradontest.com sells radon (air & water) test kits.
Enter this promotional code 9720406 when you check out and save 5%
The Pennsylvania DEP has a short video on radon and other information.
You can read the actual - PA DEP Radon Mitigation Standards: (RMS).
The EPA website for Radon provides lots of information.
The EPA pamphlets about Radon are available at their web site.
The EPA Radon Zone Maps are available for every state
Bob Vila has even discussed Radon
A research project found a possible link between Radon exposure and Alzheimer and Parkinson disease.