Evidence of annealing-induced transformation of radicals in irradiated tooth enamel

Vorona, Igor; Ishchenko, S. S.; Baran, N. P.; Petrenko, T.L.; Rudko, V.V.

doi:10.1016/j.radmeas.2005.12.002

Cited by 22 publications

(25 citation statements)

References 18 publications

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“…That observation was interpreted as a result of a conversion of disordered radicals into oriented ones. A recent publication by the same group (Vorona et al, 2006) reports that an annealing of irradiated samples (for 20 minutes at temperatures up to 320 °C) resulted in a transformation of orthorhombic CO 2 -centers into axial ones. It was concluded that both the CO 2 -types should be present at B-sites.…”

Section: Symmetry Of the Radicals (Isotropic Axial Orthorhombic)mentioning

confidence: 99%

EPR dosimetry with tooth enamel: A review

Fattibene

Callens

2010

Applied Radiation and Isotopes

208

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When tooth enamel is exposed to ionizing radiation, radicals are formed that can be detected using Electron Paramagnetic Resonance (EPR) techniques. EPR dosimetry using tooth enamel is based on the (presumed) correlation between the intensity or amplitude of some of the radiation-induced signals with the dose absorbed in the enamel. In the present paper a critical review is given of this widely applied dosimetric method.The first part of the paper is quite fundamental and deals with the main properties of tooth enamel and several of its model systems (e.g., synthetic apatites). Considerable attention is also devoted to the numerous radiation-induced and native EPR signals, and the radicals responsible for them. The relevant EPR detection, identification and spectrum analysing methods are reviewed from a general point of view. Finally, the need for solid state modelling and the linearity of the dose response are investigated.The second part is devoted to the practical implementation of EPR dosimetry using enamel. It concerns the preparation of samples, specific irradiation problems, spectrum acquisition and it is described how the dosimetric signal intensity and dose can be retrieved from the EPR spectra. Special attention is paid to the energy dependence of the EPR response and to sources of uncertainties. Results of and problems encountered in international intercomparisons and epidemiological studies are also dealt with.In the final chapter the future of EPR dosimetry with tooth enamel is analysed.

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Section: Symmetry Of the Radicals (Isotropic Axial Orthorhombic)mentioning

confidence: 99%

EPR dosimetry with tooth enamel: A review

Fattibene

Callens

2010

Applied Radiation and Isotopes

208

160

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“…This center is quite stable. It was recently shown that under thermal annealing this orthorhombic paramagnetic center can be transformed into the axial paramagnetic center by thermally stimulated reconfiguration of its neighbourhood (Vorona et al, 2006). The localization of this center is still under the debate.…”

Section: Introductionmentioning

confidence: 99%

Comparative EPR study CO2− radicals in modern and fossil tooth enamel

Nosenko

Vorona

Baran

et al. 2015

Radiation Measurements

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“…9). The kinetic property of each species remains disputed, with Vorona et al (2006) that found slightly different kinetic properties for the two radical species, than the one described by Brik et al (1998) and by Scherbina and Brik (2000) (e.g. a higher annealing temperature).…”

Section: Two Types Of Co 2 -Radicalsmentioning

confidence: 91%

“…The second method was originally developed by Vorona et al (2006). This method is based on the angular variation observed over 360° rotation and a ∆ factor, which is independent of the enamel measured, but constrained by the irradiation source.…”

Section: Methods 2 (From Vorona Et Al 2006)mentioning

confidence: 99%

“…Most importantly, the three studies were performed on modern tooth enamel, which complicates the comparison with fossil sample (e.g. modern tooth usually contains a different ratio NOCORs to AICORs, after γ-irradiation between 65% and 80% of NOCORs in modern enamel (Vorona et al, 2006) against 40% in fossil enamel (Joannes-Boyau and Grün, 2009). However, as we will see later in this paper, the percentage of radicals varies considerably depending on the estimation methods used.…”

Section: Two Types Of Co 2 -Radicalsmentioning

confidence: 99%

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Detailed protocol for an accurate non-destructive direct dating of tooth enamel fragment using Electron Spin Resonance

Joannes‐Boyau

2013

Geochronometria

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Abstract:In the context of human evolution, fossil remains are too valuable to be destroyed and any alteration should be kept to a minimum. The newly developed protocol on fossil fragments has open the gate for 'virtually' non-destructive ESR (Electron Spin Resonance) direct dating of human remains. The method allows the separation of unstable and interfering signals that were responsible for large dose underestimation. While a complete investigation of the ESR signal remains a complex task and requires numerous hours of manipulations, a rapid dose assessment protocol can be achieve without compromising the accuracy nor the integrity of the sample. The new protocol should be used for future dating regardless of the possibility of measuring powder.

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Evidence of annealing-induced transformation of radicals in irradiated tooth enamel

Cited by 22 publications

References 18 publications

EPR dosimetry with tooth enamel: A review

EPR dosimetry with tooth enamel: A review

Comparative EPR study CO2− radicals in modern and fossil tooth enamel

Detailed protocol for an accurate non-destructive direct dating of tooth enamel fragment using Electron Spin Resonance

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