Projects per year
Abstract
Variation in beta dose rate within rocks may impact the results of rock surface luminescence dating, for both the burial age of cobbles and exposure age of rock surfaces. Current methods of rock surface luminescence dating assume that radionuclides are homogeneously distributed inside rocks. In this study, two rapid methods based on beta counting and on a portable XRF instrument were developed to measure the radioactivity of rock slices. These methods were applied to rock slices from four glaciofluvial granite cobbles that had previously been used for equivalent dose determination to test whether beta dose variation could be observed. Results from beta counting and K content from XRF show similar patterns and both vary along the depth profiles, but the magnitude of this variability is very different amongst the four cobbles. In rocks where the dose rate is highly variable, bleaching may not be the only source of variation of Ln/Tn or equivalent dose (De) along the luminescence-depth profile of cobbles, and it may be necessary to measure the beta dose rate for every single slice to determine whether multiple bleaching events are recorded or variations in De are due to dose rate heterogeneity.
Original language | English |
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Article number | 101349 |
Number of pages | 8 |
Journal | Quaternary Geochronology |
Volume | 72 |
Early online date | 16 Jun 2022 |
DOIs | |
Publication status | Published - 01 Aug 2022 |
Keywords
- Beta counting
- Beta dose rate heterogeneity
- Homogeneity
- Rock luminescence dating
- XRF
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Dive into the research topics of 'Rapid assessment of beta dose variation inside cobbles, and implications for rock luminescence dating'. Together they form a unique fingerprint.Projects
- 2 Finished
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ROOFToP - Understanding the response of glaciers in the 'Third Pole' to rapid climate change - Xianjiou Ou (EU/WG)
Roberts, H. (PI)
Llywodraeth Cymru | Welsh Government
01 Mar 2017 → 29 Feb 2020
Project: Externally funded research
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Developing the next generation of Quaternary dating methods using a high resolution spatially resolved luminescence imaging system.
Duller, G. (PI) & Roberts, H. (CoI)
Natural Environment Research Council
01 Jan 2014 → 31 Mar 2016
Project: Externally funded research