Grant Stockly bombarded some of his Apple II equipment with x-rays and produced these interesting images: Apple IIe motherboard, Disk II controller card, Disk II.
His posts to the Classic Computer mailing list describe the process:
“The X-Rays are at 300dpi. I’m not an X-Ray tech so my calibration was a little off. Our resident X-ray guy is gone today. I’m not sure he would be interested in an Apple IIe motherboard any way. ; ) Some areas are dark. By adjusting “Levels” in photoshop you can bring them out.