![]() ![]() The certification was presumably made by gamma-ray comparisons with the NBS radium standard (Secondary Standard No.6). Accordingly, it was subdivided into ten, hermetically sealed, glass tubes of about 100 mg each. This was not a standard source, but was intended for research purposes. Stratton, the Director of the Bureau, which was then as now a part of the Department of Commerce. ![]() A replica of the coffer with dummy radium tubes was set on a table in the East Room of the White House during the ceremony. As the document indicates, it was a Certificate for Radioactive Material submitted for measurement and certification to the National Bureau of Standards. Instead, she was presented with a golden key to the coffer and a certificate. The hazardous source itself was not brought to the ceremony. On May 20, 1921, Marie Curie visited the White House to receive the gift of the gram of radium from President Harding. ![]()
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