Despite briefing the hospital 6 years ago to have my MRIs of my back ready with the surgeon in time for my visit, they weren't there. He sent me for standing X-rays on a hi power machine. The first lot didn't 'come out', so I had a second set of blasts. It was for the very lowest part of my back, and I wouldn't be surprised that these very hi-power machines are causal in some cancer.
Some 'experts' are now saying that we shouldn't be using x-ray at all unless it's vital. I had a bad feeling about that day when it happened.
Flying must pose a slight risk, but there is also the factor of five-point harnesses and long periods with one's pants pulling on one's nuts.
Daft job really.