If you're taking the film as carry-on, I was told that the "xray" machine is not actually using X-rays but is instead using magnetism to "view" inside your bag like an MRI, so really it shouldn't have any effect. That didn't make sense to me since that would mean all the metallic stuff in carry-ons would get magnetized including disk drives...
In any case I've taken 400 speed film through more than 10 zaps and never had a problem, even in third world airports that weren't using the latest "x-ray" machines. Asking for a hand check seemed to me to be creating more of an opportunity for a screw up than anything else.
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