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The effect of test dose and first IR stimulation temperature on post-IR IRSL measurements of rock slices Cover

The effect of test dose and first IR stimulation temperature on post-IR IRSL measurements of rock slices

Geochronometria
Volume 43 (2016): Issue 1 (February 2016)
By: Jinfeng Liu,  Andrew Murray,  Reza Sohbati and  Mayank Jain  
Open Access
|Dec 2016

Figures & Tables

(a) Study area located at the western part of China, Pamir Plateau. (b) Samples were taken from the SW side of the Muztagh Ata massif. This fig was modified after the Fig. 1A in Owen et al., (2012). (c) Photo of the glacial gneissic boulder (MUST 88) from which the sample was taken (Seong et al., 2009).
(a) Typical decay curves and (inset) dose response curves of IR50 (dashed line) and pIRIR290 (solid line) signals. (b) The variation of the IR50 and pIRIR290 “residual signals” with depth into the rock surface.
The ratio of the “residual signal” (steps 1-5, 1-6, Table 1B) to the initial signal (steps 1-3, 1-4) at different preheat and stimulation temperatures. Three slices were measured at each temperature. The error bars represent one standard error.
Laboratory dose response curves for different test doses, where the regeneration doses are given in increasing or decreasing order. For (a) and (b) the test dose is 4 Gy, (c) and (d) -53 Gy, and (e) and (f) ~595 Gy. The solid and dashed lines represent doses given in increasing and decreasing order, respectively. The numbers (1), (2) and (3) show the order in which the regeneration doses were given. Three slices were measured at each point. The insets show the dose responses of the sensitivity uncorrected signal (Lx). All data were normalized to the saturation value of their corresponding fitted dose-response curve. The Do values corresponding to the solid Lx/Tx curves, based on a single saturating exponential fit, are presented in the individual figures.
a) Summary of data in Fig. 4a, 4c and 4e. b) Summary of data in Fig. 4b, 4d and 4f.
Sensitivity change monitored by a large test dose (595 Gy). (a) Increasing regeneration doses followed by decreasing doses. (b) Decreasing regeneration doses followed by increasing doses. Three slices were used at each point.
Effect of first stimulation temperature on the degree of saturation. Test doses in (a) and (c) are ~53 Gy and in (b) and (d) ~595 Gy. The shadowed area covers 10% deviation from unity (i.e. 0.9 to 1.1). Three slices were measured at each temperature. The error bars represent one standard error.

The post-IR IRSL SAR protocols used in this study

StepABC

In experiment C, Ln is the signal resulting from the natural dose, the natural+2688 Gy or bleached+2688 Gy, as appropriate. Tn is the corresponding test dose signal

1-1Natural or Regeneration doseDose (4400 Gy)Natural, Natural+2688 Gy, bleached+2688 Gy or Regeneration dose
1-2Preheat at 320°C for 100 sPreheat at T°C for 100 s

T ranges from 260 to 400°C in steps of 20°C.

Preheat at 320°C for 100 s
1-3IR at 50°C for 200 s (Lx,50)IR at 50°C for 200 s (Lsat, 50)IR at T °C for 200 s

T is 50, 200 and 250°C

1-4IR at 290°C for 200 s (Lx,290)IR at (T-30)°C for 200 s (Lsat, T-30)IR at 290°C for 200 s (Ln or Lsat)
1-5IR at 50°C for 200 s (Linherited, 50)
1-6IR at (T-30)°C for 200 s (Linherited, T-30)
2-1Test doseTest dose
2-2Preheat at 320°C for 100 sPreheat at 320°C for 100 s
2-3IR at 50°C for 200 s (Tx,50)IR at T °C for 200 s
2-4IR at 290°C for 200 s (Tx,290)IR at 290°C for 200 s (Tn or Tsat)
3-1IR at 325°C for 200 s (Thermo-optical wash)IR at 325°C for 200 s (Thermo-optical wash)
DOI: https://doi.org/10.1515/geochr-2015-0049 | Journal eISSN: 1897-1695
Journal RSS Feed
Language: English
Page range: 179 - 187
Submitted on: Feb 3, 2016
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Accepted on: Nov 29, 2016
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Published on: Dec 30, 2016
Published by: Sciendo
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year
Keywords:
luminescence dating,
rock surface,
post-IR IRSL (pIRIR),
SAR protocol,
test dose correction,
first IR stimulation temperature
Related subjects:
Geosciences,
Geosciences, other

© 2016 Jinfeng Liu, Andrew Murray, Reza Sohbati, Mayank Jain, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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