@ alexh
"...Becareful X-raying anything with flash and ESPECIALLY EPROMS as they will erase..."
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If that was the case, then you wouldn't be able to ship any of those components internationally, as they are all X-rayed. All items sent in the Royal Mail are X-rayed, so second hand components would be erased too. I have yet to see any computer hardware (programmable or not) that can be damaged by X-rays in the diagnostic range (maximum of 150 kilovolts, electromagnetic).