= Nobel Prize in Physics in 1903
{c}
One half went to <Henri Becquerel> for discovering spontaneous <radioactivity>. <Pierre Curie> and <Marie Curie> each received one quarter for investigating that radiation.<The Nobel Prize in Physics 1903 by Nobel Prize Outreach>[Official summary: laureates, prize shares and motivation]{ref} <Becquerel's uranium-radiation experiment> and <Curie ionization-current measurement> expose two complementary experimental routes into <radioactivity>.
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