Well, I've sent an SD card to space (on a student project). In such an environment, you do run the risk of data failure and other failures in the sorts of what is mentioned here. To be exact, in space you can expect impact of tiny particles at any random spot on your electronics and they can cause a short circuit. So you make systems 3x redundant.
On earth the risk is much lower. There are so many electronics on an airplane that we should've known the risks of gamma radiation by now. There is no radiation shielding, just EMC (electromagnetic) shielding on the electronics to protect from noise and inaccurate measurements.
Why would image sensors be extremely different from other precision electronics? Why don't we have our forums filled with complaints of deminished image quality from all the travel photographers?
On the other hand, film camera's do suffer from the x-ray scanners as it causes a color cast on the exposures. That's a whole different thing...