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Trees with unusual spikes in carbon 14 can also indicate a Miyake event.

Miyake’s efforts paid off, however, when the data revealed an anomalously large increase in the concentration of carbon 14 precisely in the year C.E.

Only a fleeting fraction is radioactive carbon 14, also called radiocarbon.

In the case of carbon, the solar activity can form carbon 14, which is absorbed by tree rings as they grow.

All living things absorb carbon 14, a radioactive carbon isotope that decays at a regular rate over time.