Patrick, microwave ovens emit microwaves (radio waves in the gigahertz frequency), not X-Rays.
Originally Posted by Ektagraphic
Although actually...if the seals on your microwave are working right, hopefully it's not emitting anything!
I experiment with high voltage as another hobby, and I've taken apart several microwave ovens. One time, I actually powered up the magnetron tube from a microwave...outside of a microwaven oven. I limited the power though. But it lit up a neon tube with no wires, and it put a loud hum on my stereo.
Anyway, that's a whole other topic.
I just found this topic through a group Flickr, by the way. I was asking if anyone had tried using X-Ray films in a camera. Someone in the group gave me a link.