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並前往https://pubs.geoscienceworld.org/segweb/economicgeology/article-abstract/61/3/563/17616/Thorium-uranium-and-potassium-concentrations-in

Thorium, uranium and potassium concentrations in granites ...

The uranium and thorium content of these older rocks, measured by gamma-ray spectrometry, is more than twice the average for silicic igneous rocks in ...

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