774–775 carbon-14 spike

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Science and technology

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What Wikipedia says

The 774–775 carbon-14 spike is an observed increase of around 1.2% in the concentration of the radioactive carbon-14 isotope in tree rings dated to 774 or 775 CE, which is about 20 times higher than the normal year-to-year variation of radiocarbon in the atmosphere.

Excerpt from the Wikipedia article “774–775 carbon-14 spike”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Isosik, CC BY-SA 4.0, via Wikimedia Commons.