Henri Becquerel, French physicist

Credit: GARY BROWN/SCIENCE PHOTO LIBRARY

Caption: Antoine Henri Becquerel (1852-1908), French physicist and discoverer of radioactivity. Educated at the Ecole Polytechnique in Paris, he became professor of physics in 1895. In 1896 Becquerel discovered the phenomenon of radioactivity by showing that a uranium salt was able to blacken a photographic plate. In 1899 he noted that the radiation coming from the uranium salt was deflected by a magnetic field. Becquerel concluded that this radiation was partly composed of charged particles. He also discovered that radiation is toxic. Becquerel shared the 1903 Nobel Prize in physics. The International Standard (SI) unit of radioactivity is named after him.

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