2 ms·

Steel not polluted by atomic-age testing?

• mikeash 12y ago
  And just to be clear, that's totally a thing and not at all crazy. See: http://en.wikipedia.org/wiki/Low-background_steel http://en.wikipedia.org/wiki/Low-background_steel It's really, really, really hard to produce steel without any atmospheric contamination. Salvaged ships built before the beginning of atmospheric nuclear testing are the main source of steel that isn't contaminated with radioactive material.
• achr2 12y ago
  Your comment led me to look up low-background steel. Very interesting thanks.