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Becquerel at table with large magnet. No date or location given. Antoine Henri Becquerel (1852-1908) was a French physicist and the discoverer of radioactivity. After Wilhelm Conrad Röntgen's discovery of x-rays, Becquerel noted an unknown energy that was emitted from uranium salts. He left a rock and a well-wrapped photographic plate in his desk 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 "in recognition of the extraordinary services he has rendere...