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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.

There are three stories about the euro crisis: the Republican story, the German story, and the truth. -- Paul Krugman
by Carrie (migeru at eurotrib dot com) on Sun Apr 8th, 2012 at 08:05:56 PM EST
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