Word: polonium
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Dates: during 1923-1923
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...pitchblende mine in Bohemia, from which uranium was extracted by the Austrian Government. By a new method of chemical analysis based on measuring the radioactivity of various fractions with delicate electrical apparatus, they were able to announce in July, 1898, the existence of a new radio-active element, polonium (named for Mme. Curie's native country, Poland), and, in December, of the most powerful of all such elements, radium. It was not until 1902, however, that they could prepare a decigram of chloride of pure radium, and from its spectrum determine its atomic weight...