On this page about Ernest Rutherford:
In 1898 Rutherford was appointed to the chair of physics at McGill University in Montreal, Canada, where he did the work which gained him the 1908 Nobel Prize in Chemistry. He had demonstrated that radioactivity was the spontaneous disintegration of atoms. He noticed that a sample of radioactive material invariably took the same amount of time for half the sample to decay — its "half-life" — and created a practical application for this phenomenon using this constant rate of decay as a clock, which could then be used to help determine the actual age of the Earth that turned out to be much older than most scientists at the time believed.
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Pickering and atom-splitter Ernest Rutherford...
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Timeline of particle physics technology
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Cavendish Professor of Physics
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List of theoretical physicists
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