Phenomenological model of aluminium-hole ([AlO4/h+]0) defect formation in sedimentary quartz upon room temperature irradiation: electron spin resonance (ESR) study

Benzid, Khalif; Timar-Gabor, Alida

doi:10.1016/j.radmeas.2019.106187

Cited by 15 publications

(3 citation statements)

References 35 publications

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“…This recombination process is accompanied by the emission of photons. 9,16–21 (ii) The second one is related to electron traps that give rise to a signal above 200 °C in the TL glow curve. The signal spectrum is relatively wide and asymmetric between two sides of the short and long wavelengths.…”

Section: Resultsmentioning

confidence: 99%

Thermoluminescence properties and new insights on the UV-vis absorption features of colorless quartz after γ-ray irradiation

Ngoc,

Ca,

Thanh

et al. 2024

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Thermoluminescence properties and new insights on the UV-vis absorption features of colorless quartz after γ-ray irradiation

Ngoc,

Ca,

Thanh

et al. 2024

RSC Adv.

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“…However, it should be noted that the absence of a significant correlation between the ESR signals and Al concentrations may simply result from the relatively large uncertainty on the ESR intensities (3.3 and 4.9%; Table 5), which could make such correlation difficult to detect. Additionally, the ESR signal considered in this study relates to the Al-hole centre (e.g., Benzid and Timar-Gabor, 2020), though it is known that other (non ESR-measurable) Al centres may be created during sample irradiation (e.g., Al-OH; Bahadur et al, 2008). Unfortunately, there is very little knowledge regarding the production rate or the thermal stability of each Al signal component, which may also be sample dependant.…”

Section: Esr and Icp-oes Resultsmentioning

confidence: 99%

Insights into the relationship between luminescence and ESR dating signals from Spanish sedimentary quartz samples of different geologic origins

Demuro

Duval

Arnold

et al. 2020

Quaternary International

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“…Quartz was first used in the ESR dating of sediments and fault gouges in the 1980s [1][2][3][4][5] and has continued to be used to date Quaternary eolian, shoreline beach, fluvial, and lacustrine sediments during the last decade [6][7][8][9][10][11][12][13][14][15][16][17][18]. The extraction of pure quartz from sediments is required for accurate dating.…”

Section: Introductionmentioning

confidence: 99%

The ESR Signals in Different Minerals and the Bleaching of Feldspar

Bi,

Yi,

Yang

et al. 2023

Minerals

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The use of quartz is critical to the electron spin resonance (ESR) dating of sediments and fault gouges. The germanium center (Ge center) in quartz is a commonly used color center employed in ESR signal measurement. Although Ge center signals in quartz can be detected using an ESR spectrometer, they are weak and sometimes undetectable. Impurities in quartz grains can further aggravate these deficiencies and may even invalidate any attempt to repeat ESR ages due to the deficiencies evident in the processes used in sample preparation. Using sieving, carbonate-organic matter removal, water flotation, magnetic separation, heavy liquid separation, and HF solution etching, we separated quartz, feldspar (plagioclase), mica, and the heavy minerals and measured the ESR signal in each of them to examine the impact of impurities within mineral grains on the ESR signals. From the ESR spectra, we observed intense ESR signals in feldspar and the heavy minerals and weak signals in mica at the same positions as the Ge center in the quartz. The ESR signals in the feldspar proved to be the most intense and overrode the peaks exhibited by the Ge center in the quartz. Feldspar is commonly associated with quartz in sediments, but it is difficult to separate it from quartz as their colors, specific gravities, and magnetic properties are similar. Any ESR signal in quartz containing foreign minerals would therefore be likely to be heavily disturbed by the signals from these foreign minerals, particularly from the feldspar and heavy minerals. ESR signals in the feldspar decreased similarly to those in the quartz when exposed to sunlight, declining by 70%–80% after being exposed for 50 h. Such declination was more obvious in high-altitude areas than in low-altitude areas. Our results indicate that highly pure quartz is required when dating; we would therefore strongly suggest that the procedures for the purification of quartz grains should include floating, heavy liquid separation, and HF solution etching to remove the feldspar, heavy minerals, and any remnant magnetite. Such a procedure would guarantee that the signal that is measured comes from the quartz alone, allowing repeatable measurements using the same spectrometer as well as valid comparisons between the spectrometries derived from different spectrometers.

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Phenomenological model of aluminium-hole ([AlO4/h+]0) defect formation in sedimentary quartz upon room temperature irradiation: electron spin resonance (ESR) study

Cited by 15 publications

References 35 publications

Thermoluminescence properties and new insights on the UV-vis absorption features of colorless quartz after γ-ray irradiation

Thermoluminescence properties and new insights on the UV-vis absorption features of colorless quartz after γ-ray irradiation

Insights into the relationship between luminescence and ESR dating signals from Spanish sedimentary quartz samples of different geologic origins

The ESR Signals in Different Minerals and the Bleaching of Feldspar

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