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Characteristics of Pulsed Blue and Green Light Stimulated Luminescence Signals of Quartz and Feldspars Cover

Characteristics of Pulsed Blue and Green Light Stimulated Luminescence Signals of Quartz and Feldspars

Geochronometria
Volume 48 (2021): Issue 1 (January 2021)
By: Jintang Qin,  Jie Chen and  Kechang Li  
Open Access
|Dec 2021

Figures & Tables

Fig. 1

Time resolved post-IR PBLSL and post-IR PGLSL curves of the quartz and K-feldspars. TR-post-IR PBLSL curves for a) bright quartz of Q-HD and b) K-feldspar of F-NTS, and TR-post-IR PGLSL curves for c) bright quartz of Q-HD and d) K-feldspar of F-NTS. The channel width is 512 ns and the photon count rate is the integration of signal during the initial 2.4 s stimulation. The curves are truncated at 700 μs for clarity. The vertical dashed lines in a) and c) indicate the timing of the end of on-period and off-period for the subsequent post-IR PBLSL and post-IR PGLSL measurements.

Fig. 2

The raw and normalized post-IR PBLSL (dashed line) and post-IR PGLSL (solid line) decay curves for quartz and feldspars. a) and e) quartz of Q-CAL; b) and f) quartz of Q-HD; c) and g) quartz of Q-QB; d) and h) feldspar of F-PST. The effective stimulation time is calculated by multiplying the ratio of the on period to the sum of on and off period with the total stimulation time.

Fig. 3

Variation of the integrated luminescence intensity (circle) and their associated relative counting error (square) for the post-IR PBLSL (open symbol) and post-IR PGLSL (solid symbol) signals of quartz aliquots. a) Q-CAL; b) Q-HD and c) Q-QB.

Fig. 4

Variation of the normalized post-IR PBLSL (circle) and post-IR PGLSL (square) intensity on the pulsed stimulation temperature for quartz and feldspars. a) Q-CAL; b) Q-HD; c) Q-QB; d) Q-NTS; e) F-PST and f) F-NTS. The signal intensity was integrated using the initial 0.4 s effective stimulation time with subtraction of the integration of the last 1 s effective stimulation time.

Fig. 5

Variation of the relative feldspar contribution to the post-IR PBLSL (open circle) and post-IR PGLSL (solid square) signals with the integration period for the hypothetical quartz (Q-HD) and feldspar (F-NTS) mixture under various pulsed stimulation temperatures. a) 25°C; b) 50°C; c) 75°C; d) 100°C; e) 125°C and f) 150°C.

Fig. 6

Variation of the relative feldspar contribution to the post-IR PBLSL (open circle) and post-IR PGLSL (solid square) signals with the integration period for the hypothetical quartz (Q-NTS) and feldspar (F-NTS) mixture under various pulsed stimulation temperatures. a) 25°C; b) 50°C; c) 75°C; d) 100°C; e) 125°C and f) 150°C.

Fig. 7

Variation of the normalized post-IR PBLSL (circle) and post-IR PGLSL (square) intensity with the temperature of IR stimulation prior to the pulsed stimulation for quartz and feldspars. a) Q-CAL; b) Q-HD; c) Q-QB; d) Q-NTS; e) F-PST and f) F-NTS. The signal intensity was integrated using the initial 0.4 s effective stimulation time with subtraction of the integration of the last 1 s effective stimulation time.

Fig. 8

Box plots of De values measured by various measurement procedures. a) post-IR PGLSL and b) post-IR PBLSL stimulated at 25°C; c) post-IR PGLSL and d) post-IR PBLSL stimulated at 125°C. The De value determined by the conventional BLSL signal of quartz of 17YDE2C is shown in d).

List of samples investigated in this study_

OriginMineralGrain size (μm)
Qaidam Basin, dune sandsQuartz, Q-QB125–180
Otindag Desert, dune sandsQuartz, Q-HD125–180
Northern Tian Shan, fluvial sandsQuartz, Q-NTS; K-feldspar, F-NTS125–180
DTU Risø laboratoryQuartz, Q-CAL90–180
ShantouPerthite, F-PST90–125
Qaidam Basin, dune sands*Quartz, 17YDE2C125–180
Junggar Basin, dune sands*K-feldspar, 15MNS01125–180

Procedures for investigating the characteristics of post-IR PBLSL and post-IR PGLSL signals_

StepTreatmentObservation
1Give dose, DR Gy
2Preheat at 260°C for 10 s
3IR stimulation for 100 s at TIR
4Pulsed blue light stimulation for 200 s at TBLPost-IR PBLSL
5Give dose, DR Gy
6Preheat at 260°C for 10 s
7IR stimulation for 100 s at TIR
8Pulsed green light stimulation for 200 s at TGLPost-IR PGLSL
9Return to step 1
DOI: https://doi.org/10.2478/geochr-2020-0038 | Journal eISSN: 1897-1695
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Language: English
Page range: 138 - 146
Submitted on: Feb 13, 2019
|
Accepted on: Jul 30, 2020
|
Published on: Dec 31, 2021
Published by: Sciendo
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year
Keywords:
pulsed stimulation,
green light,
low temperature,
long integration period
Related subjects:
Geosciences,
Geosciences, other

© 2021 Jintang Qin, Jie Chen, Kechang Li, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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