There was also a big test done in the UK which had the same results as Kodak and the TSA stateside....nobody has actually managed to cause any detectable damage to photographic film by passing it even multiple times through hand baggage inspection systems. I think they were taking 800 speed film through at least 15 scans, processing it and looking carefully for even the faintest signs of the x-rays...and found none.
I've not been on here very long but I haven't seen any post from someone who has actually experienced film being damaged in hand baggage x-ray scanners. Nobody has actually posted scans or photos of negatives which exhibit the effects of x-rays.
So taking all the anecdotes along with the more scientific tests......this issue really ought to be closed.
And just to add to the anecdotes, I've been flying with film 20 years and even Delta 3200 pushed to 6400 seems fine going through at least seven scanners. My late father started flying with film in the 70s and even on trips to China in 1984 had no problems, using 100 and 400 ASA (as it were then). I've not encountered anyone who can show me a photo damaged by x-ray scanners except the Kodak website where the film was deliberately damaged by checked bag scanners.