EPR Dating of Hydroxyapatite from Fossil Bones. Transient Effects after γ and UV Irradiation

• Authors: M. Wencka , S. Hoffmann , H. Hercman
• Languages of publication: EN

Abstracts

EN

ESR measurements at room temperature have been performed on fossil bones of cave bear (from Magurska Cave of the Tatra Mountains) and mammoth (from Dniestr River). Various paramagnetic centres related to defects in hydroxyapatite were identified. The ESR spectrum is dominated by Mn^{2+} lines and free radical centres CO_2^- and CO_3^-. Suitability of various EPR lines for the dating was evaluated. The spectra are affected by γ-ray and UV irradiation which produce new relatively unstable (transient) radical centres. From their decay curves we determined the delay period (waiting time) between irradiation and ESR dating measurements. For γ-rays the period is about 15 days and depends on the chosen ESR line. UV generates mainly surface O^- centres which decay practically after a few days. The ESR dating of the bear bones using an additive dose method given the age t = 21.7 kiloyears (ky), whereas from radionuclide Th/U method t= 34 ky and from radiocarbon ^{14}C method t > 33.1 ky.

Keywords

EN

76.30.-v; 65.90.+i

Discipline

• 65.90.+i: Other topics in thermal properties of condensed matter (restricted to new topics in section 65)
• 76.30.-v: Electron paramagnetic resonance and relaxation(see also 33.35.+r Electron resonance and relaxation in atomic and molecular physics; 87.80.Lg Magnetic and paramagnetic resonance in biological physics)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2005
• Volume: 108
• Issue: 2
• Pages: 331-337

Dates

published

2005-08

received

2005-04-24

Contributors

author

M. Wencka

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

author

S. Hoffmann

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

author

H. Hercman

• Institute of Geological Sciences, Polish Academy of Sciences, Twarda 51, 00-818 Warszawa, Poland

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Identifiers

DOI

10.12693/APhysPolA.108.331