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1896 Becquerel

He came up with radioactivity. He found this out from unknown x-rays waves, which were produced by uranium. Penetrating radiation was also discovered by Becquerel. He also discovered that uranium was able to expose a photographic plate on black paper, and didn’t depend on the chemical state.

http://dbhs.wvusd.k12.ca.us/webdocs/Gallery/Becquerel.GIF

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