Response to effect of airport x-ray on Tri-X 400

I'll repeat a question here that I have asked before in similar discussions: Has anyone out there actually experienced fogging, streaking or other damage to film that can be attributed to airport X- ray machines?? I've seen countless of these discussions, but never one post from someone who has had problems. Now, I'm sure that at some point X-ray machines will fog film given enough exposure, however, I regularly travel back and forth over the Atlantic with loaded 4x5 film holders, both in my hand luggage and checked bags. These are loaded with Tri-X and T Max 100. Some of these have made it through the scanners at Heathrow in London 3 or 4 times with no ill effects. So, I'm curious: Is there evidence, I mean real evidence, of film fogging or is it just another myth or advertising ploy by the lead bag manufaturers? ;^D)

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