RC Pilot,
Sorry to hear the radon treatment in France wasn't satisfactory. However, I think you'll be happy with the results the Jachymov waters will have on your AS. It's been almost a year since my last treatment and I'm still going strong (only taking meds when needed-which isn't often).
One strange thing I noticed after last year's treatment: weight gain (8+ kilos). I haven't read anywhere that gaining weight is a side effect, but after 5 years of trying to put weight on my emaciated AS body, it just sort of came out of nowhere--might have something with the radon helping the body produce natural cortisone or something.
I've decided to return to the Radium Palace this summer-winters are just too beautiful where I live and I'm really feeling the need to fast during my winter break (not for the weight gain-fasting is the second most effective treatment for my AS-after the radon treatment, of course).
Keep us up to date on how this works for you!