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Research in radium began at the National Bureau of Standards (NBS) in December, 1913 when a phial containing 20.28 milligrams of pure radium arrived from abroad.  It was a certified equivalent to the International Radium Standard at Sevres, and a cover communication described its comparison with another quantity of radium salts prepared at Vienna and accepted as a second standard. NBS served hospitals and physicians by analyzing their radium salts against the international standard. Ernest Dorsey was the principal NBS researcher on radium as he made intercomparisons of sealed radium standards and started an investigation of the gamma-ray method of radium measurement. [From: Measures for Progress by Rexmond C. Cochrane, p. 146-147]

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