<p>Ten years ago I took a round-the-world trip with a pile of film, some of which went through 21 flights before being processed (and some I think went through as many as 30 flights). To be honest, I can't remember how many hand inspections I was granted and how many times my film was x-rayed, but it certainly went through several scanners, and none of it suffered any adverse effects.</p><p>As recommended, don't put your film in checked luggage, but to worry about film going through carry-on x-ray scanners, especially if it's just a return trip from the US to Europe, is to be, in my experience, unnecessarily paranoid. By all means request a hand inspection, but if it's refused, don't worry about it. I wouldn't bother with the hassle of locating film/processing in France/Switzerland either.</p><p>And I'd forget about the lead-lined film bag too. What will likely happen in that case is that the security person will see the lead-lined bag on their monitor and insist that the contents be taken out and put through the scanner again.</p>