Henri Becquerel, French Physicist

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Henri Becquerel, French Physicist
Antoine Henri Becquerel (1852-1908), French physicist and the discoverer of radioactivity. After Roentgen's discovery of x-rays, Becquerel noted an unknown energy that was emitted from uranium salts. He left a rock and a wrapped photographic plate in a drawer and found later that the plate, though unexposed to light, had developed patterns which would ordinarily indicate exposure. Announced in 1896, he had accidentally discovered a new penetrating ray that came to be called radioactivity. Soon after, his student Marie Sklodowska-Curie, and her husband Pierre Curie showed that thorium also emitted what were then called Becquerel rays. In 1900 Becquerel isolated electrons in radiation, and in 1902 he presented the first evidence of radioactive transformation. In 1903, he shared the Nobel Prize in Physics with Pierre and Marie Curie for the discovery of spontaneous radioactivity. The SI unit for radioactivity, the becquerel (Bq), is named after
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