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.
The motherboard received a dose rate of 17.84 R/min for the scans and calibration. About 27 minutes (for 3 scans and a calibration). This would have been a dose of 482 Rad.
The Disk II card received the same dose rate, but it was in the vault for the whole time the motherboard was in there. It received radiation for a total of about 32 minutes. 571 Rad.
To put it in perspective, if a group of people were exposed to that dose 50-90% would die after 30 days. (90% without intensive medical care). Primary cause of death is internal bleeding and infections. Females become permanently sterile.”
Regarding the Disk II:
“This image includes the entire range of densities. If I were to penetrate the motor I would blow through the plastic.
This is a high resolution x-ray. Zoom into the front label and see if you can read the embossed name plates… What COLOR is this actual drive? The answer is in there! ; )
This shot was taken with the drive elevated at an angle by foam so that you would get a 3d feeling and not a flat picture.”