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25-October-2004, 02:18 PM
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Here is a paper by some researchers who have found some Fe60 in some 3 million year old deep sea crust material. Because of the relatively short half-life of Fe-60, the suggestion is that this is most likely the result of a nearby supernova [20-120 parsecs] that happened about 3 million years ago. The researchers propose looking for other isotopes Be-10, Al-26, Pu-244, and others to confirm and better date the source of the Fe60.
Deep-Ocean Crusts as Telescopes: Using Live Radioisotopes to Probe Supernova Nucleosynthesis
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