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In 1815, for example, Berzelius isolated a new element from a mineral sent to him from the Swedish mining town of Falun and named it thorium after the Scandinavian god of thunder, Thor. Only to ...

The most promising nucleus for a potential nuclear clock is currently thought to be thorium-229, with nuclear excitation states that require photons of about 8 eV, over 200,000 times higher.

Also, when such measurements are the concluding stage in the analysis of thorium and uranium, it is desirable that the method of preparation is quantitative.