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Marie and Pierre Curie combined activity measurements with repeated chemical separations of pitchblende residues, inferring and concentrating the new radioactive elements polonium and radium.
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The Curies’ use of radioactivity to guide chemical separation demonstrated that nuclear signatures could reveal trace chemical species and helped establish radiochemistry.
The source experiment, observation, anomaly, or problem materially motivated the development, revision, or acceptance of the target concept. Historical influence is not logical derivation; the edge detail states the documented role and avoids retrospective origin myths.
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