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Conference Proceedings of the 13th International Conference “Methods of Absolute Chronology” June 5-7th, 2019, Tarnowskie Gory, Poland
Języki publikacji
Abstrakty
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.
Wydawca
Czasopismo
Rocznik
Tom
Strony
61--72
Opis fizyczny
Bibliogr. 40 poz., rys.
Twórcy
autor
- Department of Geoinformatics, Physical and Environmental Geography, Geochronological Research Group, University of Szeged Szeged, Hungary
autor
- 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
- Department of Geoinformatics, Physical and Environmental Geography, Geochronological Research Group, University of Szeged Szeged, Hungary
autor
- Department of Geoinformatics, Physical and Environmental Geography, Geochronological Research Group, University of Szeged Szeged, Hungary
autor
- Department of Geoinformatics, Physical and Environmental Geography, Geochronological Research Group, University of Szeged Szeged, Hungary
autor
- Department of Applied and Environmental Chemistry, University of Szeged Szeged, Hungary
autor
- Department of Applied and Environmental Chemistry, University of Szeged Szeged, Hungary
Bibliografia
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- 5. Bell WT, 1980. Alpha dose attenuation in quartz grains for thermoluminescence dating. Ancient TL 12: 4–8.
- 6. Bos AJJ., Wallinga J, Johns C, Abellon RD, Brouwer JC, Schaart DR and Murray AS, 2006. Accurate calibration of a laboratory beta particle dose rate for dating purposes. Radiation Measurements 41(7–8): 1020–1025, DOI:10.1016/j.radmeas.2006.04.003.
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- 9. Bowman SGE and Huntley DJ, 1984. A new proposal for the expression of alpha efficiency in TL dating. Ancient TL 2: 6–8.
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- 11. Buechi MW, Lowick SE, Anselmetti FS, 2017. Luminescence dating of glaciolacustrine silt in overdeepened basin fills beyond the last interglacial. Quaternary Geochronology 37: 55–67, DOI:10.1016/j.quageo.2016.09.009.
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- 21. Kadereit A and Kreutzer S, 2013. Risø calibration quartz – A challenge for β-source calibration. An applied study with relevance for luminescence dating. Measurement 46(7): 2238–2250, DOI:10.1016/j.measurement.2013.03.005.
- 22. Kreutzer S, Schmidt C, DeWitt R and Fuchs M, 2014. The a-value of polymineral fine grain samples measured with the post-IR IRSL protocol. Radiation Measurements 69: 18–29, DOI:10.1016/j.radmeas.2014.04.027.
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- 25. Murray AS and Wintle AG, 2003. The single aliquot regenerative dose protocol: Potential for improvements in reliability. Radiation Measurements 37(4–5): 377–381, DOI:10.1016/S1350-4487(03)00053-2.
- 26. Ogata M, Hasebe N, Fujii N and Yamakawa M, 2017. Measuring apparent dose rate factors using beta and gamma rays, and alpha efficiency for precise thermoluminescence dating of calcite. Journal of Mineralogical and Petrological Sciences 112: 336–345.
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- 31. Richter D, Zink AJC., Przegietka KR, Cardoso GO, Gouveia MA and Prudêncio MI, 2003. Source calibrations and blind test results from the new Luminescence Dating Laboratory at the Instituto Tecnológico e Nuclear, Sacavém, Portugal. Ancient TL 21(1): 43–48.
- 32. Schmidt C, Bösken J and Kolb T, 2018. Is there a common alpha-efficiency in polymineral samples measured by various infrared stimulated luminescence protocols?. Geochronometria 45: 160–172, DOI:10.1515/geochr-2015-0095.
- 33. Singhvi AK and Aitken MJ, 1978. Americium-241 for alpha irradiations. Ancient TL 3: 2–9.
- 34. Sipos Gy, Kiss T and Tóth O, 2016. Constraining the age of flood-plain levels along the lower section of River Tisza, Hungary. Journal of Environmental Geography 9(1–2): 39–44, DOI:10.1515/jengeo-2016-0006.
- 35. Sipos Gy, Marković SB, Filyó D, Tóth O, Gavrilov MB, Nagy I, Lukic T, Bartyik T, Kiss T, Mezősi G, (in prep). Aeolian dust deposition during the last glacial cycle at the centre of the Backa Loess Plateau, Vojvodina, Serbia.
- 36. Thiel C, Buylaert JP, Murray AS, Terhorst B, Hofer I, Tsukamoto S and Frechen M, 2011. Luminescence dating of the Stratzing loess profile (Austria) – Testing the potential of an elevated temperature post-IR IRSL protocol. Quaternary International 234: 23–31, DOI:10.1016/j.quaint.2010.05.018.
- 37. Thomsen KJ, Murray AS, Jain M and Bøtter-Jensen L, 2008. Laboratory fading rates of various luminescence signals from feldspar-rich sediment extracts. Radiation Measurements 43: 1474–1486, DOI:10.1016/j.radmeas.2008.06.002.
- 38. Tribolo C, Kreutzer S and Mercier N, 2019. How reliable are our beta-source calibrations? Ancient TL, 37(1): 1–10.
- 39. Zimmerman DW, 1971. Thermoluminescent dating using fine grains from pottery. Archaeometry 13(1): 29–52.
- 40. Zimmerman DW, 1972. Relative thermoluminescence effects of alpha- and beta-irradiation. Radiation Effects 14: 81–92, DOI:10.1080/00337577208230476.
Typ dokumentu
Bibliografia
Identyfikator YADDA
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