A Tenth of a Gram

Marie Curie measured pitchblende and got a number that was too big: the ore was four times as active as the uranium inside it could explain. Proving why took four years of boiling tonnes of ore in a leaking shed, and produced polonium, radium, and the illness that killed her. Run her electrometer, do the separation, and set the half-life clock. Episode 07 of the Great Scientists series.

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