http://www.computerhope.com/issues/ch001027.htm
That's one of several articles on the subject Google finds. Additionally, you can read the following:
http://en.wikipedia.org/wiki/X-ray_machine
I only gave it a very quick glance, but since it doesn't sound like X-Ray machines use magnetrons or very strong magnets in their assembly, you're golden. Remember as well that a myriad number of business travelers fly every day and would be subjecting their laptops and other devices to hundreds more scans than you and yet we don't hear about data loss from them.