Empirical assessment of beta dose heterogeneity in sediments: Implications for luminescence dating ...
Optically stimulated luminescence (OSL) dating of single grains is often required to determine an accurate age for partially-bleached sediment by identifying those grains with OSL signals that were well bleached prior to burial. However, single-grain De distributions are typically characterised by g...
| Main Authors: | , , , |
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| Format: | Text |
| Language: | unknown |
| Published: |
Elsevier
2020
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.48350/153224 https://boris.unibe.ch/153224/ |
| Summary: | Optically stimulated luminescence (OSL) dating of single grains is often required to determine an accurate age for partially-bleached sediment by identifying those grains with OSL signals that were well bleached prior to burial. However, single-grain De distributions are typically characterised by greater amounts of scatter in comparison to multiple grains. Here we investigate the scatter in single-grain De distributions of quartz from 56 proglacial samples associated with the retreat of the last British-Irish Ice Sheet. Our findings provide the first empirical dataset showing that beta-dose heterogeneity can impact the extrinsic scatter in single-grain De distributions, in addition to partial bleaching in nature. The additional scatter in single-grain De distributions caused by beta-dose heterogeneity suggests that it is inappropriate to apply a fixed threshold to determine between well-leached and partially-bleached De distributions, but the skewness of the De distributions could alternatively be used. ... |
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