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The Curies

In Our Time

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Marie Curie, What Are Uranic Rays?

Marie Curie investigated what were known as Uranic Rays. She discovered two new chemical elements in the pitch blend, polonium and radium. One ton of pitch blend contained something like a tenth of a gram of radium and much less polonium. And she embarked on what turned into a massive task to extract this new element that was somewhere in uranium ore.

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