Hi Luigi.
Did you discussed something like this:
http://www.cancer.gov/cancertopics/factsheet/Risk/radonwith the medical stuff that works at Jachymov Centre?
I am verry interested in this therapy, but my rheumatologist told me to stay put, because it can cause cancer if the exposure is long enough and to let this as an option for my 60'x or 70's....
Still, i don't know how much to rely on her asessment...