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All natural rocks contain small amounts of uranium and thorium , which are radioactive and remain so for billions of years.
The analysis shows that manganese, titanium, hafnium, thorium , phosphorus, and the rare-earth elements play a significant role in discriminating between zircons of various origins.
The concentrations of iron and thorium , for instance, have proved useful in distinguishing rock types from one another and in monitoring geochemical processes.
Deep within Earth, some diamonds come into contact with radioactive materials, such as thorium or uranium, that can impart a unique signature known as a radiation halo.
In addition to primeval heat, Earth's core also gets heat from radioactive decay of uranium, thorium , and potassium.
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