{"id":40297,"date":"2020-01-18T11:33:00","date_gmt":"2020-01-18T10:33:00","guid":{"rendered":"https:\/\/rinconeducativo.org\/?post_type=re_efemeride&p=40297"},"modified":"2025-06-11T11:39:35","modified_gmt":"2025-06-11T09:39:35","slug":"january-18-1945-death-sonia-cotelle-determined-half-life-thorium-230-established-atomic-number-polonium","status":"publish","type":"re_efemeride","link":"https:\/\/rinconeducativo.org\/en\/anniversaries\/january-18-1945-death-sonia-cotelle-determined-half-life-thorium-230-established-atomic-number-polonium\/","title":{"rendered":"January 18, 1945 - Death of Sonia Cotelle, who determined the half-life of thorium-230 and established the atomic number of polonium"},"content":{"rendered":"
\n
\"Sonia
Sonia Cotelle (Source: Muse\u00e9 Curie)<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n

With a degree in general, biological and applied chemistry from the Sorbonne University (France), she specialised in radioactive sources.<\/p>\n\n\n\n

In 1919, she began her work as a researcher, joining the team of scientist Marie Curie<\/a> at the Institut du Radium (now the Curie Museum) in Paris (France).<\/p>\n\n\n\n

Between 1926 and 1927, she researched polonium and actinium in collaboration with Marie Curie. She also determined the half-life or average lifetime of ionium, the name by which thorium-230 was known at the time.<\/p>\n\n\n\n

Between 1927 and 1936, Cotelle lived in Czechoslovakia and determined the atomic number of polonium using X-ray <\/a>spectroscopy.<\/p>\n\n\n\n

If you would like to learn more about this scientist, click on the following link: Sonia Cotelle<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

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