MAKE A MEME View Large Image US radium standard 1927.jpg radium chloride kept by the US Bureau of Standards that served as the primary standard of radioactivity for the United States in 1927 and several subsidiary working standards This was officially known as the ...
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Keywords: US radium standard 1927.jpg radium chloride kept by the US Bureau of Standards that served as the primary standard of radioactivity for the United States in 1927 and several subsidiary working standards This was officially known as the Secondary radium standard no 6 which had in 1913 been calibrated against the International Radium Standard a similar tube of radium chloride prepared by Marie Curie kept by the Bureau Internationale des Poids et Measures International Bureau of Weights and Measures at Sevres France This was determined to contain 20 68 mg of radium chloride corresponding to 15 44 mg of radium in 1913 Since radium decays at a rate of about 1 in 25 years at the time of this picture it was estimated to contain 15 360 mg of radium 1927 Retrieved January 19 2014 from https //books google com/books id 5h_9yYrnBCYC pg PA403 Standards Yearbook 1927 US National Bureau of Standards Dept of Commerce printed by US Government Printing Office Washington D C p 399 fig 30 on Google Books George K Burgess Director US National Bureau of Standards other versions PD-USGov Uploaded with UploadWizard Radium
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