Protecting iPods from X-Rays
Normally, low-level x-rays utilized by airport scanners don’t harm electronic equipment. People put laptops, PDAs, cell phones, and other devices through them all the time without problems. I’d say that you have nothing to fear.
Just don’t send a cat through one. Cats hate it. I know from experience. 
Airport security made a former girlfriend put her cat through the scanner. I’m not sure which one cried louder; the lady or the cat. But what was certain though was that the two of them made quite a spectacle — half the people in the airport stopped to stare.
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Tom Hesley