The growth rings of a tree at Bristol Zoo, England. Each ring represents one year; the outside rings, near the bark, are the youngest.

Radiocarbon dating helped verify the authenticity of the Dead Sea Scrolls.

Willard Libby, the inventor of radiocarbon dating

North Ronaldsay sheep on the beach in North Ronaldsay, Scotland. In the winter, these sheep eat seaweed, which has a higher δ13C content than grass; samples from these sheep have a δ13C value of about −13‰, which is much higher than for sheep that feed on grasses.

Measuring 14 C is now most commonly done with an accelerator mass spectrometer