Half-life refers to when half of the original amount of unstable isotopes of elements decay into a more stable form i.e. Carbon-12. 

Half-Life in Absolute Dating

Isotopes differ based on anatomic weights and numbers of neutrons in the nucleus. They can be stable and unstable elements. 

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Chronometric dating methods use chronological age estimates of the antiquity of an object in years before the present through physical and chemical measurements. This can tell anthropologists the time of occurance, creation of material, when used, or altered. 

Chronometric or Absolute Dating 

The smallest piece of a chemical element or ordinary matter

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Shook, B., Nelson, K., Aguilera, K., & Braff, L. (2019). Explorations: An Open Invitation to Biological Anthropology. American Anthropological Association Arlington. 978-1-931303-62-0

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