TIL about “Low Background Steel” which was steel produced before the first atomic bomb tests so not contaminated with radionuclides that came from the increased background radiation. This steel was needed to produce Geiger counters and sensitive medical equipment. Shipwrecks were a popular source.

Read more: https://en.wikipedia.org/wiki/Low-background_steel

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  1. Shipwrecks we’re a great source, but submerged railroad train cars were more common, at least in the U.S., and easier to extract… Luckily, these days we’ve passed the time frame, from the last time we tried to be really stupid with nukes, so most new steel has a low enough radiation level, that it’s safe to use, but it’s still there!!!

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