Luminescence signals and estimates of dose rate from sediment cores, Lake Suigetsu, Japan

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This dataset is available under the terms of the Open Government Licence

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https://doi.org/10.5285/73ee6512-a7c6-464c-bae0-38862ab8b87a

This dataset contains information about the luminescence signals measured from the Lake Suigetsu sediment cores across four time periods: the last 500 years (537 to -47 cal BP), the Laschamp geomagnetic excursion (44,828 to 35,550 cal BP), the limit of varves (73,130 to 69,413 yr BP) and glacial termination I (139,499 to 118,001 yr BP). Sampling intervals varied between time periods (see supporting documentation for more information). The luminescence signals were quantified using Portable Optically Stimulated Luminescence (POSL) analysis of bulk sediment using blue light and infrared exposures, and laboratory profiling analysis of prepared quartz fine fractions (using blue light exposures) and polymineral fine fractions (using blue light and infrared exposures). This data was collected to determine if these methods could be used to detect past catchment environmental change. Alongside this dataset, we estimated dose rate at six points across the four time periods studied using elemental concentrations. This data was collected to see if the luminescence signals measured from the Lake Suigetsu cores could be used to determine burial age.

The work was supported by the NERC IAPETUS2 Doctoral Training Partnership.

Publication date: 2023-05-26

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Format

Comma-separated values (CSV)

Spatial information

Study area

Spatial representation type

Tabular (text)

Spatial reference system

WGS 84 / Pseudo-Mercator

Provenance & quality

The Lake Suigetsu cores were subsampled under red light conditions following the sampling schemes detailed in the supporting documentation. Samples were immediately subjected to portable optically stimulated luminescence (POSL) analysis using a POSL reader to yield “net” and “depletion” values following blue light (POSL) and infrared (PIRSL) exposures, as well as a POSL/IRSL ratio. Subsequently, the samples underwent physical separation to isolate fine grains (5-50µm) and then chemically treated to isolate quartz and polymineral fractions. These fractions were then measured in a Risø TL/OSL system to yield estimates of equivalent dose and sensitivity when exposed to blue light (quartz and polymineral) and infrared light (polymineral only). Separate subsamples were analysed using Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) to determine the concentration of uranium, thorium and potassium in each. These concentrations were then used to provide estimates of dose rate based on two scenarios – one assuming activity-free grains, and one assuming that the activity of each grain is identical to that of the matrix. Assumptions of water content and cosmogenic dose rate were made to facilitate these calculations.

Licensing and constraints

This dataset is available under the terms of the Open Government Licence

Cite this dataset as:

Rex, C.L.; Staff, R.A.; Sanderson, D.C.W.; Cresswell, A.J.; Nakagawa, T. (2023). Luminescence signals and estimates of dose rate from sediment cores, Lake Suigetsu, Japan. NERC EDS Environmental Information Data Centre. https://doi.org/10.5285/73ee6512-a7c6-464c-bae0-38862ab8b87a

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