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A new quartz for 𝛾-transfer calibration of radiation sources Cover

A new quartz for 𝛾-transfer calibration of radiation sources

Geochronometria
Volume 47 (2020): Issue 1 (January 2020)
By: D. Richter,  C. Woda and  K. Dornich  
Open Access
|Dec 2020

Figures & Tables

Fig. 1

Sketch of the sample holder, materials with respective densities and irradiation geometry.

Fig. 2

Ratio of measured to given β-dose (3.7 Gy) for preheat (10 s duration) temperatures between 160 and 300 °C with a fixed test dose preheat (TPH) of 160°C for 0 s, measured with zeroed material. The means with standard deviations for three aliquots for each temperature step are given. The dotted line represents unity, the dark grey area indicates 5% and the light grey area indicates 10% deviation from unity.

Fig. 3

Interpolation of the average equivalent β-irradiation duration obtained by SAR for the γ-irradiated coarse grain quartz (10 aliquots) on the linear fit of the measured versus given irradiation time for several β-recovery durations obtained by SAR (four aliquots each).

Fig. 4

SARA regression analysis of SAR β-duration results (in seconds of irradiation by the β-source to be calibrated) of γ-irradiated coarse grain quartz which has received additional exposures of 0, 5, 10, 20 and 30 s from β-irradiation (seven aliquots per point).

Fig. 5

Interpolation of the normalized (γLn/βTn) OSL-signal from coarse grain γ-irradiated quartz (n=10) onto the normalized OSL (βLn/βTn) signal for various β-irradiations (average of four aliquots each) of LexCal2014 material, which has received identical treatments prior to irradiation.

Fig S1

Stamp for simultaneous administration of silicone to ten aliquots for preparation of large (6 mm) aliquots, whereas the stamp for small (e.g. 0.2 mm) aliquots has a different stamp size.

Fig S2

IRSL signal for a regeneration β-dose of 3 Gy.

Fig S3

Lx/Tx ratios (normalized to the first value) of 7 aliquots for 10 times the same (3.7 Gy) regeneration β-dose are well within the generally accepted 10% deviation (light grey) of recycling ratios to unity (5% in dark grey).

Fig S4

Relative dose with distance from the side of irradiation (triangles) and relative dose for two-sided irradiation (diamonds), based on MC simulations. The relative dose for two-sided irradiation is normalized to the dose in the first mm for single sided irradiation.

Fig S5

Average Tn/Tx ratios of the last dose (recycling) point from SAR β-DRT (3.7 Gy) sequences for different preheat temperatures with fixed cutheat at 160°C (4 aliquots for each temperature step).

Fig S6

Mean recycling ratios and standard deviations for 4 aliquots for various preheat temperatures with cutheat fixed at 160°C (0 s) for a β-DRT of 3.7 Gy. The dotted line represents unity, the dark grey area indicates 5% and the light grey area indicates 10% deviation from unity.

Fig S7

Example of Tn/Tx-ratios for a 7 cycle (in this order of: natural, 4 regeneration doses, recuperation and recycling point) SAR DRT of a 3.7 Gy β-dose for a single aliquot, showing the small sensitivity changes. The dotted line represents unity, the dark grey area indicates 5% and the light grey area indicates 10% deviation from unity.

Fig S8

Mean measured dose and standard deviation of LexCal2014 quartz, measured with the SAR protocol more than one year after a γ-irradiation. Data for the average from 5 aliquots was analysed in 0.02s steps of stimulation time.

Fig S9

Normalized regeneration (Lx/Tx) for increasing β-doses for a single aliquot measured using SAR and for 2-3 aliquots for increasing additive doses. The inset shows the OSL response for the linear range of the dose-growth-curve. Uncertainties here are smaller than the symbols.

Fig S10

Time resolved OSL (365 nm detection window) after 50 μs blue stimulation of a 3.7 Gy β-irradiation.

Fig S11

OSL decay curves normalized to the initial datapoint of the raw signal intensity. The measurement of the γ-irradiated sample was performed one year after irradiation, while a prompt (no delay between irradiation and measurement) approach for the β-irradiated sample was used.

Nominal post-IR blue-OSL depletion ratios for late and early background subtraction_

Aliquot NoLate background subtracted depletion ratioEarly background subtracted depletion ratio
10,960,96
20,910,90
30,880,88
40,880,88
50,920,92
60,910,91
70,890,88
80,910,91
average0,910,91
sd0,030,03

Results (weighted average of measured doses) for coarse-grain SAR β-dose recovery (DRT) experiments, ratios of given/measured β-dose, number of aliquots measured and aliquot size_

given β-dose (Gy)ratio given/measured dose±n aliquotsaliquot size
2.280.9930.013106 mm
3.041.0050.010106 mm
3.800.9920.020192 mm
4.561.0170.01096 mm

Calibration results (weighted mean and sd) over the course of a 20 months period_

Calibration dateGy s-1±
25.10.20160.1550.006
01.11.20160.1560.008
16.11.20170.1550.004
07.05.20180.1560.004

Results of test dose preheat (THP) experiment for 3 aliquots each for a preheat temperature of 200°C_ Mean and standard error for SAR results as ratio to the 3_7 Gy β-dose to be recovered_

Cutheat temperature (°C)Average ratios measured/given dosese
1601,010,04
1800,990,02
2000,990,01
2201,010,02
DOI: https://doi.org/10.2478/geochr-2020-0020 | Journal eISSN: 1897-1695
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Language: English
Page range: 23 - 34
Submitted on: Dec 19, 2019
|
Accepted on: Aug 28, 2020
|
Published on: Dec 31, 2020
Published by: Sciendo
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year
Related subjects:
Geosciences,
Geosciences, other

© 2020 D. Richter, C. Woda, K. Dornich, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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