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26/02/1896 Radioactivity is discovered

14:51

Radioactivity ~ Henri Becquerel, Marie & Pierre Curie

9:11

Nuclear Physics 7: The Discovery of Radioactivity

2:39

Physical Science : About the Discovery of Radioactivity

French physicist Henri Becquerel accidentally put a wrapped photographic plate in a closed desk drawer with a piece of uranium on top. It remained there several days. When Becquerel later developed the photographic plate, he found an image of the uranium piece. He realized that uranium generates some kind of radiation.
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    • Essentials 

    • History of discovery 

    • Early health dangers 

    • Units of radioactivity 

    • Types of decay 

    • Radioactive decay rates 

    • Mathematics of radioactive decay 

    • Changing decay rates 

    • Theoretical basis of decay phenomena 

    • Occurrence and applications 

    • Origins of radioactive nuclides 

    • Decay chains and multiple modes