Parallel calibration transfer and systematic effects in retrospective absorbed dose estimation using OSL

Burbidge, Christopher Ian; Cardoso, J.; Cardoso, Glêbia Alexa; Franco, J. Lorenzo; Santos, Luís; Caldeira, M.

doi:10.1016/j.quageo.2016.04.001

Cited by 3 publications

(7 citation statements)

References 37 publications

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“…During SAR-based measurements using a 90 Sr / 90 Y beta source, incident beta particles penetrated the grain to a certain depth alongside backscattered electrons which had energies less than the initial source energy (Bell, 1980). Thus, the absorbed beta dose should decrease with increasing grain size (Wintle and Aitken, 1977;Goedicke, 2007;Hansen et al, 2018). That is why Hansen et al (2018), building on findings of Greilich et al (2008), attribute the undesirable overdispersion of their calibration value to variation of grain shape and volume because lowenergy beta particles are increasingly attenuated in grains > 100 µm, as already described by Bell (1980).…”

Section: Discussionmentioning

confidence: 78%

“…Most of these were identified by previous studies including grain-size-dependent build-up and attenuation of charge (e.g. Wintle and Aitken, 1977;Goedicke, 2007;Autzen et al, 2017). During SAR-based measurements using a 90 Sr / 90 Y beta source, incident beta particles penetrated the grain to a certain depth alongside backscattered electrons which had energies less than the initial source energy (Bell, 1980).…”

Section: Discussionmentioning

confidence: 96%

“…The interplay of these mechanisms depends on mineral type (Aitken, 1985), on grain transparency (Bell and Mejdahl, 1981), beta-source-to-grain distance (Wintle and Aitken, 1977), grain size (Goedicke, 2007;Armitage and Bailey, 2005;Mauz and Lang, 2004) and the sample carrier's substrate (Greilich et al, 2008;Armitage and Bailey, 2005;Mauz and Lang, 2004;Wintle and Aitken, 1977). In addition, accuracy and/or precision of the calibration value depend on the measurement protocol (Guérin and Valladas, 2014;Kadereit and Kreutzer, 2013), the atomic numbers (Z) of mineral and sample carrier (Hansen et al, 2018) and the accuracy of the gamma dose to mineral calculation (Burbidge et al, 2016;Tribolo et al, 2019). Despite this wellestablished body of knowledge, Hansen et al (2015) note an unexplained 3 % dispersion of their calibration data, subsequently investigated by Autzen et al (2017).…”

Section: Introductionmentioning

confidence: 99%

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Technical note: On the reliability of laboratory beta-source calibration for luminescence dating

et al. 2021

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Abstract. The dose rate of the 90Sr / 90Y beta source used in most luminescence readers is a laboratory key parameter. There is a well-established body of knowledge about parameters controlling accuracy and precision of the calibration value but some hard-to-explain inconsistencies still exist. Here, we have investigated the impact of grain size, aliquot size and irradiation geometry on the resulting calibration value through experiments and simulations. The resulting data indicate that the dose rate of an individual beta source results from the interplay of a number of parameters, most of which are well established by previous studies. Our study provides evidence for the impact of aliquot size on the absorbed dose in particular for grain sizes of 50–200 µm. For this grain-size fraction, the absorbed dose is enhanced by ∼ 10 %–20 % as aliquot size decreases due to the radial increase of dose rate towards the centre of the aliquot. The enhancement is most variable for 50–100 µm grains mounted as aliquots of < 8 mm size. The enhancement is reversed when large grains are mounted as small aliquots due to the edge effect by which the dose induced by backscattered electrons is reduced. While the build-up of charge dictates the increase of absorbed dose with the increase of grain size, this principle becomes more variable with changing irradiation geometry. We conclude that future calibration samples should consist of subsamples composed of small, medium, large and very large quartz grains, each obtaining several gamma doses. The calibration value measured with small, medium and large aliquots is then obtained from the inverse slope of the fitted line, not from a single data point. In this way, all possible irradiation geometries of an individual beta source are covered, and the precision of the calibration is improved.

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Section: Discussionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Technical note: On the reliability of laboratory beta-source calibration for luminescence dating

et al. 2021

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“…However, with regard to beta-source calibration a higher precision is desirable. Burbidge et al (2016) show that parallel multiple-aliquot calibration transfer provides better accuracy and precision than single-aliquot measurements on single-dosed samples. Bos et al (2006) show that 290 the uncertainty can be reduced to 0.9%.…”

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confidence: 95%

Technical note: On the reliability of laboratory beta-source calibration for luminescence dating

Mauz¹,

Martin²,

Discher³

et al. 2020

Preprint

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“…The calibration of radiation sources used in dosimetric dating is usually accomplished via cross-calibration with quartz which has received a g-irradiation (e.g. Burbidge et al, 2016;Göksu et al, 1995;Guérin and Valladas 2014;Hansen et al, 2015). The dose-rate is obtained by comparison of the luminescence response to the known g-dose and the luminescence response to different irradiation times using the radiation source to be calibrated.…”

Section: Introductionmentioning

confidence: 99%

A new quartz for

Richter

Woda

Dornich³

2020

Geochronometria

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Quartz grains extracted from aeolian sand (LexCal2014) are tested for suitability as transfer material for radiation source calibration. After thermal pre-treatment, this quartz exhibits luminescence and dose-response properties which appear appropriate for transfer calibration purposes with little dependence of recovered β-dose on preheat temperature in the single aliquot (SAR) procedure and satisfying performance in β-dose recovery (0.98−1.00 given/measured β-dose for various experiments). Additional support is obtained by SARA and interpolation procedures, where OSL-data from γ-dosed LexCal2014 is interpolated on data obtained for zeroed LexCal2014 quartz, which is β-irradiated by the source to be calibrated. Initial results on fine-grain material agree with the coarse grain results presented.The γ-dose of 3.00 ± 0.07 Gy is administered in a scatter-free geometry at the IAEA/WHO Secondary Standard Dosimetry Laboratory (SSDL) of the Helmholtz Zentrum München, with absorbed dose calculations obtained by Monte Carlo simulations.

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Parallel calibration transfer and systematic effects in retrospective absorbed dose estimation using OSL

Cited by 3 publications

References 37 publications

Technical note: On the reliability of laboratory beta-source calibration for luminescence dating

Technical note: On the reliability of laboratory beta-source calibration for luminescence dating

Technical note: On the reliability of laboratory beta-source calibration for luminescence dating

A new quartz for

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