Folks, there are TWO KINDS of scanners that have been in use for decades now...
- Short pulse low dose X-rays are used in Security scans of HAND LUGGAGE
- CT scans inherently use stronger doses of X-rays to obtain images of CHECKED BAGGAGE
Kodak had been providing warning for a LONG TIME, about the relative safety of <ISO 1600 film in Security X-ray scanners, but had also WARNED about damage to film of any speed by the cargo CT scanners!
So the story quoted is
a rehash of what was already true about film risk, although the newer CT technology might well be less destructive than the older CT scanners that have been in use for scanning checked luggage.
IOW, if you have been deliberately not putting exposed film into checked luggage, and put it in hand carry luggage, your risk to your film will be no greater tomorrow, than the magnitude of risk over the past decade!
BTW, exposed film is MORE vulnerable than unexposed film, because the film has been taken beyond the minimum threshhold during the picture taking, so incremental exposure to radiation will show to a greater extent.
As for the comment about Heathrow refusing hand inspection of film, that has been true of hand carry film since the 1980's, per my own experience of passing thru Heathrow repeatedly over the decades.