Personally I wouldn't worry too much about it. I have travelled in and out of europe a lot, and have had my film x-rayed, and really have not seen a problem. I think if you were to have multiple exposures with really fast film you might be in trouble.If you are just going to France, get the stuff hand inspected in the states, and try for a hand inspection in France. Do put the film in a separate bag so they don't keep it under the scanner too long. My camera bag frequently drives xray guys nuts and they look at it for a long time, probably not a good idea for film.
Also watch out for museums and such, as some of them put your stuff through xrays also.