Radiocarbon: a global time marker in tree-rings

Particle Physics (IPA)

Cosmic-ray events, such as exceptionally large solar eruptions, are recorded globally in trees. This is what 67 scientists from 56 institutions under the leadership of the Laboratory of Ion Beam Physics at ETH Zurich and the WSL Birmensdorf show in a study based on more than 400 radiocarbon analyses of 44 tree-ring records.

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