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Dose Response of the E1’ Centre in Quartz

Shin Toyoda

Shin Toyoda

Department of Applied Physics, Okayama University of ScienceOkayama, Japan
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Toyoda, Shin
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Mana Amimoto

Mana Amimoto

Department of Applied Physics, Okayama University of ScienceOkayama, Japan
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Amimoto, Mana
  
31. Dez. 2021
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Artikel-Kategorie: Conference Proceedings of the 5Asia Pacific Luminescence and Electron Spin Resonance Dating Conference October 15–17, 2018, Beijing, China. Guest Editor: Liping Zhou
Online veröffentlicht: 31. Dez. 2021
Seitenbereich: 191 - 196
Eingereicht: 14. Feb. 2019
Akzeptiert: 11. März 2020
DOI: https://doi.org/10.2478/geochr-2020-0037
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© 2019 Shin Toyoda et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig. 1

(a) ESR spectra observed in irradiated quartz samples. The peak at lower field gets smaller with dose relative to the one at higher field, indicating the contribution from the counterfeit E1’ centre signal. (b) ESR spectra after post-heating at 170°C of the same samples in (a). The signal shapes of all spectra return to those of the “real” E1’ centre with clear two peaks.
(a) ESR spectra observed in irradiated quartz samples. The peak at lower field gets smaller with dose relative to the one at higher field, indicating the contribution from the counterfeit E1’ centre signal. (b) ESR spectra after post-heating at 170°C of the same samples in (a). The signal shapes of all spectra return to those of the “real” E1’ centre with clear two peaks.

Fig. 2

Results of the stepwise heating experiments with duration of 15 minutes at each step. The samples were pre-heated and subsequently irradiated as indicated prior to the stepwise heating.
Results of the stepwise heating experiments with duration of 15 minutes at each step. The samples were pre-heated and subsequently irradiated as indicated prior to the stepwise heating.

Fig. 3

The dose responses of the signal intensities of the E1’ centre observed in samples with no preheating. The natural quartz sample aliquots were irradiated to the indicated doses and the signal intensities were measured (no heating). The samples were then post-heated at 170°C and the signal intensities were measured (170°C). Then, the samples were again subsequently heated at 300°C before the third ESR measurements (300°C).
The dose responses of the signal intensities of the E1’ centre observed in samples with no preheating. The natural quartz sample aliquots were irradiated to the indicated doses and the signal intensities were measured (no heating). The samples were then post-heated at 170°C and the signal intensities were measured (170°C). Then, the samples were again subsequently heated at 300°C before the third ESR measurements (300°C).

Fig. 4

The dose responses of the signal intensities of the E1’ centre observed in samples with post-heating at 170°C. The sample portions were pre-heated at indicated temperatures, then, 12 aliquots were prepared from each portion and irradiated to the doses as indicated. The aliquots were post-heated at 170°C in order to remove the interference of the counterfeit signal, and the signal intensities were measured.
The dose responses of the signal intensities of the E1’ centre observed in samples with post-heating at 170°C. The sample portions were pre-heated at indicated temperatures, then, 12 aliquots were prepared from each portion and irradiated to the doses as indicated. The aliquots were post-heated at 170°C in order to remove the interference of the counterfeit signal, and the signal intensities were measured.

Fig. 5

The dose responses of the signal intensities in samples with pre-heating at 400°C without post-heating and with post-heating at indicated temperatures. The sample aliquots were irradiated to the doses as indicated and ESR signal intensities were measured (no heating). The aliquots were post-heated at 170°C and ESR signal intensities were measured. Then, subsequently heated at 300°C before the third ESR measurements.
The dose responses of the signal intensities in samples with pre-heating at 400°C without post-heating and with post-heating at indicated temperatures. The sample aliquots were irradiated to the doses as indicated and ESR signal intensities were measured (no heating). The aliquots were post-heated at 170°C and ESR signal intensities were measured. Then, subsequently heated at 300°C before the third ESR measurements.
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