Okay, you can find exceptions, but most everyone believes that digital cameras and media are safe when it comes to airport xray machines. Example:
http://www.geeksugar.com/322103In theory, you could damage the media and the camera with a high enough exposure to X-rays but the level would be way out of scale for an airport X-ray machine. The security folks will frown at you and maybe tell you its unnecessary but they are, by their rules, required to hand inspect a camera of any kind if you request it. Their rules, however, don't say they have to do it willingly or quickly or without a decision that
you might need a closer inspection as well
Personally, my gear has gone thru a fair number of airport machines and I don't worry about it now.
Dick