1 янв 1896 г. - Henri Becquerel

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Henri Becquerel was studying the fluorescent properties of uranium salts and placed a piece of the uranium salt on top of a photographic plate wrapped in black paper. He discovered, upon development, that the plate was exposed in the shape of the uranium sample. Becquerel had discovered radioactivity. The radiation emitted by the uranium shared certain properties with x-rays and light.

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