Radioactive decay in molten core hints at early origin of geomagnetic field.
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References
Murthy, V. R., van Westrenen, W. & Fei, Y. Experimental evidence that potassium is a substantial radioactive heat source in planetary cores. Nature, 423, 163 - 165, (2003).
Gessmann, C. K. & Wood, B. J. Potassium in the earth's core?. Earth and Planetary Science Letters, 200, 63 - 78, (2002).
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Ball, P. Potassium heated Earth's core. Nature (2003). https://doi.org/10.1038/news030505-5
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DOI: https://doi.org/10.1038/news030505-5