I recently forgot to take hand carry on a box of unexposed 4x5 HP5 Sheet Film. It went thought baggage check in my suitcase and was X Rayed. When I later did a film test and looked at the edge of the film my "eye ball" method of checking the film looked about 1.5 to 2 zones more dense over the base. I shot two images and developed at the same time and with the same chemistry adgtation etc.
Don't believe the TSA when they say there will be no damage!
I have always found the TSA to be cooperative if asked to hand inspect film. I also always get in the first class line when going through security. I indicate that I am a photographer on assignment. This has always got me though with no problems. Once the TSA asked to show my field camera to the staff so they could see one of these cameras for real.