Cross-calibration of an α-source used for luminescence dating by applying different samples and procedures

• Autorzy: Sipos György , Schmidt Christoph , Bartyik Tamás , Filyó Dávid , Magyar Gergő , Havasi Viktor , Kukovecz Ákos

Identyfikatory

DOI

10.2478/geochr-2021-0003

• Konferencja: Conference Proceedings of the 13th International Conference “Methods of Absolute Chronology” June 5-7th, 2019, Tarnowskie Gory, Poland
• Języki publikacji: EN

Abstrakty

EN

In terms of fine-grain luminescence dating applications, the efficiency of α-radiation in producing luminescence is an important issue when determining environmental dose rates. Efficiency is usually assessed by measuring the ratio of luminescence intensities induced by known α and β laboratory doses. Consequently, most thermoluminescence (TL)/optically stimulated luminescence (OSL) readers besides the standard 90Sr/90Y β-source can also be equipped with a 241Am α-source. A crucial point is, however, the calibration of these sources. The calibration of β-sources is routinely performed using standard quartz samples previously irradiated by a known γ-dose, though, in the case of α-sources, the procedure is less standardised, partly because there are no calibration materials with a known α-efficiency value. In this study, we aimed to cross-calibrate the built-in α-source of a RISØ TL/OSL DA-20 luminescence reader by testing and comparing five procedures, applying different samples (quartz and polymineral), different protocols multiple aliquot regeneration (MAR) and single aliquot regeneration (SAR) and different calibration sources. Throughout the tests, the performance of the fine-grain RISØ calibration quartz was also assessed. Regardless of the applied procedure, the calculated α-dose rates with one exception gave similar results. On the one hand, the applied polymineral sample due to potential fading, fairly high residuals after bleaching and relatively low infrared stimulated luminescence (IRSL) sensitivity proved to be the least optimal choice for cross-calibration. On the other hand, the tested natural fine grain quartz gave almost identical results when using different types of bleaching and different calibration α-sources. The mean dose rate determined for the source was 0.080 ± 0.004 Gy/s. The cross-calibration by using the RISØ fine grain quartz yielded somewhat higher but at the apparent uncertainty of luminescence dating still not significantly different dose rate for the source under calibration. Tests showed that the calibration quartz saturates at a relatively low α-dose, and the shape of α- and β-dose-response curves also depart from each other quite early, suggesting that cross-calibration with this material seems to be reliable only at low doses. For the first time, the a-value of the fine-grain calibration quartz was also determined using the freshly calibrated α-source, and the measurement yielded a 0.054 ± 0.003 value. We propose that after further validation of this result, the RISØ calibration quartz can ease the dose rate assessment of uncalibrated α-sources in the future.

Słowa kluczowe

EN

luminescence dating; a-source; cross-calibration; a-value; fine-grain RISØ calibration quartz

• Wydawca: De Gruyter
• Czasopismo: Geochronometria
• Rocznik: 2021
• Tom: Vol. 48, no.1
• Strony: 61--72
• Opis fizyczny: Bibliogr. 40 poz., rys.

Twórcy

autor

Sipos György

• Department of Geoinformatics, Physical and Environmental Geography, Geochronological Research Group, University of Szeged Szeged, Hungary

autor

Schmidt Christoph

• Chair of Geomorphology, Faculty of Biology, Chemistry and Earth Sciences, University of Bayreuth Bayreuth, Germany
• Institute of Earth Surface Dynamics, University of Lausanne Lausanne, Switzerland

autor

Bartyik Tamás

• Department of Geoinformatics, Physical and Environmental Geography, Geochronological Research Group, University of Szeged Szeged, Hungary

autor

Filyó Dávid

• Department of Geoinformatics, Physical and Environmental Geography, Geochronological Research Group, University of Szeged Szeged, Hungary

autor

Magyar Gergő

• Department of Geoinformatics, Physical and Environmental Geography, Geochronological Research Group, University of Szeged Szeged, Hungary

autor

Havasi Viktor

• Department of Applied and Environmental Chemistry, University of Szeged Szeged, Hungary

autor

Kukovecz Ákos

• Department of Applied and Environmental Chemistry, University of Szeged Szeged, Hungary

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