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Not sure if this has been mentioned before, but the Skapa Flow, north of Scotland, was the site of a mass sinking of WW1 German ships. Most of them were salvaged, but there's still a business in recovering steel bits from them for the purpose of constructing scientific instruments where steel is required that does not have radioactivity from the atomic bomb era. All modern steel (and everything else) is radioactive.
6000 atoms doesn't sound like many to me...
Certain techniques and devices require very low radiation materials. Geiger counters, medical applications (Whole body counting and Lung counters) and physics applications (photonics) frequently require an extremely low radiation environment, called a Low background counting chamber. A low background counting chamber is a room built with extremely heavy radiation shielding made from low-background steel. Naval vessels constructed prior to the Cold War are a primary source of low-background steel. Chief among these are reserve fleets and the German fleet scuttled at Scapa Flow. World anthropogenic background radiation levels peaked at 0.15 mSv in 1963, the year that the Partial Nuclear Test Ban Treaty was enacted. Since then, anthropogenic background radiation has decreased exponentially to 0.005 mSv per year.
Naval vessels constructed prior to the Cold War are a primary source of low-background steel. Chief among these are reserve fleets and the German fleet scuttled at Scapa Flow.
World anthropogenic background radiation levels peaked at 0.15 mSv in 1963, the year that the Partial Nuclear Test Ban Treaty was enacted. Since then, anthropogenic background radiation has decreased exponentially to 0.005 mSv per year.
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