Decomposition of the laboratory gamma irradiation component of angular ESR spectra of fossil tooth enamel fragments

Renaud Joannes-Boyau; Rainer Grün; Thomas Bodin

doi:10.1016/j.apradiso.2010.03.015

Decomposition of the laboratory gamma irradiation component of angular ESR spectra of fossil tooth enamel fragments

Renaud Joannes-Boyau^*, Rainer Grün, Thomas Bodin

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

Spectrum decomposition of the angular measurements of fossil tooth enamel fragments using an automated simulated annealing (SA) procedure shows that the mix CO2- radicals generated by laboratory irradiation is significantly different to that of the natural sample. The naturally irradiated sample contains about 10% of non-oriented CO2- radicals and a mix of 35:65 orthorhombic to axial CO2- radicals. In contrast, laboratory irradiation generated about 40% of non-oriented radicals and a large amount of orthorhombic CO2- radicals, while we failed to detect any axial CO2- radicals. The results indicate that geological aging of the sample incurs various annealing and transfer processes; their precise nature is yet unknown. Nevertheless, the understanding of the formation and transfer processes that leads to the observed mix of CO2- radicals in fossil tooth enamel is essential for the reliable application of ESR dating.

Original language	English
Pages (from-to)	1798-1808
Number of pages	11
Journal	Applied Radiation and Isotopes
Volume	68
Issue number	9
DOIs	https://doi.org/10.1016/j.apradiso.2010.03.015
Publication status	Published - Sept 2010

Access to Document

10.1016/j.apradiso.2010.03.015

Cite this

@article{0180e8a05bab4697a851f2417c9529d6,

title = "Decomposition of the laboratory gamma irradiation component of angular ESR spectra of fossil tooth enamel fragments",

abstract = "Spectrum decomposition of the angular measurements of fossil tooth enamel fragments using an automated simulated annealing (SA) procedure shows that the mix CO2- radicals generated by laboratory irradiation is significantly different to that of the natural sample. The naturally irradiated sample contains about 10% of non-oriented CO2- radicals and a mix of 35:65 orthorhombic to axial CO2- radicals. In contrast, laboratory irradiation generated about 40% of non-oriented radicals and a large amount of orthorhombic CO2- radicals, while we failed to detect any axial CO2- radicals. The results indicate that geological aging of the sample incurs various annealing and transfer processes; their precise nature is yet unknown. Nevertheless, the understanding of the formation and transfer processes that leads to the observed mix of CO2- radicals in fossil tooth enamel is essential for the reliable application of ESR dating.",

keywords = "CO radicals, ESR dating, Enamel fragment",

author = "Renaud Joannes-Boyau and Rainer Gr{\"u}n and Thomas Bodin",

year = "2010",

month = sep,

doi = "10.1016/j.apradiso.2010.03.015",

language = "English",

volume = "68",

pages = "1798--1808",

journal = "Applied Radiation and Isotopes",

issn = "0969-8043",

publisher = "Elsevier Ltd.",

number = "9",

}

TY - JOUR

T1 - Decomposition of the laboratory gamma irradiation component of angular ESR spectra of fossil tooth enamel fragments

AU - Joannes-Boyau, Renaud

AU - Grün, Rainer

AU - Bodin, Thomas

PY - 2010/9

Y1 - 2010/9

N2 - Spectrum decomposition of the angular measurements of fossil tooth enamel fragments using an automated simulated annealing (SA) procedure shows that the mix CO2- radicals generated by laboratory irradiation is significantly different to that of the natural sample. The naturally irradiated sample contains about 10% of non-oriented CO2- radicals and a mix of 35:65 orthorhombic to axial CO2- radicals. In contrast, laboratory irradiation generated about 40% of non-oriented radicals and a large amount of orthorhombic CO2- radicals, while we failed to detect any axial CO2- radicals. The results indicate that geological aging of the sample incurs various annealing and transfer processes; their precise nature is yet unknown. Nevertheless, the understanding of the formation and transfer processes that leads to the observed mix of CO2- radicals in fossil tooth enamel is essential for the reliable application of ESR dating.

AB - Spectrum decomposition of the angular measurements of fossil tooth enamel fragments using an automated simulated annealing (SA) procedure shows that the mix CO2- radicals generated by laboratory irradiation is significantly different to that of the natural sample. The naturally irradiated sample contains about 10% of non-oriented CO2- radicals and a mix of 35:65 orthorhombic to axial CO2- radicals. In contrast, laboratory irradiation generated about 40% of non-oriented radicals and a large amount of orthorhombic CO2- radicals, while we failed to detect any axial CO2- radicals. The results indicate that geological aging of the sample incurs various annealing and transfer processes; their precise nature is yet unknown. Nevertheless, the understanding of the formation and transfer processes that leads to the observed mix of CO2- radicals in fossil tooth enamel is essential for the reliable application of ESR dating.

KW - CO radicals

KW - ESR dating

KW - Enamel fragment

UR - http://www.scopus.com/inward/record.url?scp=78449265994&partnerID=8YFLogxK

U2 - 10.1016/j.apradiso.2010.03.015

DO - 10.1016/j.apradiso.2010.03.015

M3 - Article

SN - 0969-8043

VL - 68

SP - 1798

EP - 1808

JO - Applied Radiation and Isotopes

JF - Applied Radiation and Isotopes

IS - 9

ER -

Decomposition of the laboratory gamma irradiation component of angular ESR spectra of fossil tooth enamel fragments

Abstract

Access to Document

Other files and links

Fingerprint

Cite this