One hundred years ago: the date is 1903, and it is an auspicious year in the history of radiochemistry. 1903 witnessed the first published version of a radioactive decay chain; the submission of Marie Curie’s doctoral thesis; the award of the Nobel prize for physics to Becquerel and the Curies; and the recognition that radioactivity released both heat and He, with important implications for the age of the Earth and for absolute dating. These events were part of the rapid development of a new science that followed the discovery of radioactivity in 1896. For those geochemists familiar with U-series geochemistry,...

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