What is carbon 14? What is a radiocarbon date? Is it the same as a calendar date? What does radiocarbon dating measure and why does it take a long time? How does an accelerator mass spectrometer measure carbon isotopes? What can you date with radiocarbon? This film features Dr. Christine Prior of GNS Science’s Rafter Radiocarbon Laboratory in Lower Hutt, New Zealand, explaining how AMS radiocarbon dating is done at their lab. Dr. Prior explains the principles of radiometric dating and presents an example from a real client.