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Polish-born French physicist (1867–1934), she and her husband Pierre discovered two new elements, polonium and radium, in 1898. In 1911 she won the Nobel Prize for Chemistry. She died of leukemia brought about by her work with radioactive material. Partly-printed DS in French, signed “M. Curie,” one page, 8.25 x 12.5, June 15, 1923. Completed certificate (No. 2929) from Curie's laboratory at the Institut du Radium, documenting the testing of a sample of mesothorium with a suspected admixture of radium. The sample was analyzed for the emission of radium-gamma radiation ("dosage de mesothorium par le rayonnement [gamma]"), and the report contains information on the size and weight, as well as arrival and return dates of the experimental apparatus, namely a no. 42 platinum needle, and on the radium mass (6.17 mg) that would correspond to the emitted radiation of the substance analyzed. Curie explains that the mass was calculated in comparison with the laboratory’s radium standard, with a variance of error of less than 1%; the result is therefore diagnostically conclusive. In fine condition.
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