The quantity of heat generated by radioactive decay in Earth's interior is controversial. Measurements of geoneutrinos emitted from the mantle during this decay indicate that this source contributes only about half of Earth's total outgoing heat flux.
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Korenaga, J. Clairvoyant geoneutrinos. Nature Geosci 4, 581–582 (2011). https://doi.org/10.1038/ngeo1240
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DOI: https://doi.org/10.1038/ngeo1240
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