Hi Paul - Thanks for the news.
Gamma Rays are produced in large hypervelocity impacts, and this leads to 14C, 10Be and spikes in other isotopes. 660 BCE is most likely from another impact rather than an outburst from our Sun, but those happen as well, of course. I sure wish I had been able to get to Tucson. good hunting, everyone - E.P.Man and Impact in the Americas
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