Carbon dating solar flares

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So when a study in Nature identified a previously unknown and very large spike in carbon around the year AD, it raised a lot of eyebrows. Nobody could think of a historical account of unusual phenomena in the heavens that might have triggered a surge in 14 C production, and something like this should have been hard to miss. The original report, published by researchers from Nagoya University in Japan, involved analysis of Japanese cedars.

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When researchers find a bone or artifact, how do they know how old it is?

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Gardner, Purdue University. Radioactive decay rates, thought to be unique physical constants and counted on in such fields as medicine and anthropology, may be more variable than once thought. A team of scientists from Purdue and Stanford universities has found that the decay of radioactive isotopes fluctuates in synch with the rotation of the sun's core.

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