I'd just let them x-ray it! I've done this many times with B&W film with no problems even on multiple screenings! I can't vouch for color material though. The actual x-ray dose in the carry-on machines is not enough to cause the film to fog unless you plan on rating it at 3200ASA or something. I've stated this elsewhere on this site. You'd have to go through the x-ray machine probably at least 10 times to be able to measure any fog on B&W material up to 400ASA. Remember that film reacts to visible light which is low energy photons of a certain spectrum. X-rays are gamma radiation of a much higher photon energy and it takes a very long exposure to cause film darkening. That is why the mediacl industry went to the use of double emulsion film sandwiched between to radio-flourecent screens: without doing this exposures were on the order of minutes not milliseconds and at much higher energy levels than those achieved by the machines used for carry-on bags. The baggage scanners are a different story they will toast almost anything.
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