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Gamma-Irradiation Dependency of EPR and TL-Spectra of Quartz

  • Michael PlötzeEmail author
  • Dieter Wolf
  • Matthias R. Krbetschek
Chapter
Part of the Springer Geology book series (SPRINGERGEOL)

Abstract

Paramagnetic defects formed during experimental γ-irradiation with various dose (70 to 1.5 × 107 Gy, 60Co) in well documented polycrystalline quartz samples from tin-tungsten ore veins, gneiss and granite were investigated by X-band continuous-wave electron paramagnetic resonance spectroscopy at temperatures from 20–295 K. On the same samples spectrally resolved thermoluminescence measurements were carried out (temperature range 50–350 °C, heating rate 2 K/s; wavelength region 200–800 nm) to examine the relationships between the radiation dose, the EPR signal intensity and the thermoluminescence spectra to link the EPR-spectra to the centres responsible for the thermoluminescence peaks in natural quartz. The present study concerns mainly the analysis of the paramagnetic centres [AlO4]0 and [TiO4 /Li+]0. The investigation of the relationship between the EPR intensity of paramagnetic centres and the γ-irradiation dose shows an increase of the EPR intensity with values related to the impurity content. Different centres reveal different saturation behaviour but independent from concentration. The [AlO4]0 centres show saturation at about 1 × 106 Gy and the [TiO4 /Li+]0 centres already after irradiation with 5 × 103 Gy with radiogenic annealing at higher irradiation dose. From the irradiation behaviour the [TiO4 /Li+]0 centre is suggested as electron traps for the TL peaks at 150–200 °C/330–340 nm, 200 °C/510 nm and 280 °C/470–510 nm, whereas oxygen-vacancy-centres for the first peak and the [AlO4]0-centres for the other peaks are working as recombination sites.

Keywords

Quartz Electron paramagnetic resonance (EPR) Thermoluminescence Irradiation 

Notes

Acknowledgments

The presented studies were carried out with the support of the Deutsche Forschungsgemeinschaft DFG (grant Wo 489/1). We acknowledge S.S. Hafner (University Marburg) for permission to carry out the EPR measurements. We thank S.M. Sukharjevski (University St. Petersburg) for stimulating discussions and Y. Pan (University of Saskatchewan) for helpful suggestions.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Michael Plötze
    • 1
    Email author
  • Dieter Wolf
    • 2
  • Matthias R. Krbetschek
    • 3
  1. 1.ClayLab, Institute for Geotechnical EngineeringETH ZurichZurichSwitzerland
  2. 2.Institute of MineralogyTU Bergakademie FreibergFreibergGermany
  3. 3.Institute for Applied PhysicsTU Bergakademie FreibergFreibergGermany

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