Dotty -
I had surgery mid july 2006 then had RAI mid August and a large dose of I131 radiation the week following. The first part of September I headed to Italy for a few weeks R&R. I did take a letter from my nuclear medicine dr. with me, but never set off any alarms. I traveled through three international airports both ways and never had a problem. I would suggest you take the letter and if anything happens just show it to the airport. Also, I don't know how you are feeling, but I also had a wheelchair available for the long waiting and walks in the airport. Just a suggestion. If this is a vacation - enjoy, relax and live life.........................