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Related Experiment Videos

Some ESR observations on bone, tooth enamel and eggshell

A D Oduwole1, K D Sales, K J Dennison

  • 1Chemistry Department, Queen Mary & Westfield College, University of London, England.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|January 1, 1993
PubMed
Summary

Electron spin resonance (ESR) dating of Pacific bone and teeth samples revealed issues with dating signals. New Zealand samples showed weak signals, while Taumako samples exhibited saturation, impacting archaeological interpretations.

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Area of Science:

  • Archaeometry
  • Paleochronology
  • Geochronology

Background:

  • Electron spin resonance (ESR) is a geochronological technique used for dating materials like bone and teeth.
  • Accurate dating of archaeological samples is crucial for understanding historical timelines and human migration patterns in the Pacific.
  • Previous ESR studies have faced challenges with signal integrity and interpretation in oceanic island contexts.

Purpose of the Study:

  • To apply ESR dating to bone and teeth samples from historical sites in New Zealand and Taumako (Solomon Islands).
  • To evaluate the reliability of ESR dating signals in these specific archaeological contexts.
  • To investigate potential artifacts and limitations affecting ESR dating accuracy in Pacific island samples.

Main Methods:

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  • Excavation and collection of bone and teeth samples from historical sites.
  • Performance of Electron Spin Resonance (ESR) measurements on the collected samples.
  • Detailed analysis of ESR dating signals, including natural signal intensity and evidence of saturation.

    • Main Results:

    • Samples from New Zealand offshore islands exhibited weak natural ESR dating signals, obscured by organic carbon radical signals.
    • Analysis suggests the supralinearity hypothesis, previously proposed for similar samples, is an artifact of the analysis method.
    • Samples from Taumako displayed intense ESR dating signals with clear evidence of electron trap saturation.

    Conclusions:

    • The findings indicate significant challenges in applying standard ESR dating to these Pacific archaeological samples.
    • The weak signals and saturation phenomena necessitate re-evaluation of dating interpretations for these regions.
    • Further methodological refinement is required for reliable ESR dating in similar oceanic island environments.