Multiple users are reporting Kindles broken after going through airport x-ray scanners. Amazon is denying that x-rays can affect their electronic ink readers, but they are replacing the damaged units. The explanation may be another, according to Professor Daping Chu:
I don't think the radiation used in an airport scanner would ever be strong enough to damage an electronic ink display. But you can get a build up of static inside these machines, caused by the rubber belt rubbing. If that charge were to pass through a Kindle, it's conceivable that it could damage the screen. A static charge from an airport scanner could be 100 volts or more. That could permanently stick the particles to the screen.
Sounds reasonable. Amazon argues that thousands of electronic-ink based Kindles pass through airports' x-ray machines without any trouble. Perhaps the difference is that, in the case of the damaged Kindles, users may be putting them out of their bags. This would leave their screens fully exposed to effects of the static electricity and fry them.
Still, Amazon is replacing these Kindles with new ones but, if you are a Kindle user, I would recommend not taking them out of your bag, just in case. [Telegraph]