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de Stigter, Henko (2019): Radionuclide 210Pb and 226Ra data measured on sediment cores during SONNE cruise SO242/1. PANGAEA, https://doi.org/10.1594/PANGAEA.905443

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Abstract:
Sediment profiles of 210Pb and 226Ra, radio-isotopes from the 234U decay series with half-lives of respectively 22.3 and 1600 year, were measured in multicores collected from the DISCOL Experimental Area in the Peru Basin during SO242-1, for determining biological mixing rates integrated over a ~100 year time-scale. Total 210Pb and 226Ra activity were determined directly by gamma-spectrometry, whilst total 210Pb was also measured indirectly by alpha-spectrometry via its granddaughter isotope 210Po. Activities of anthropogenic 137Cs proved to be generally below detection level. Radionuclide activities are reported in the data base as mBq g-1 dry sediment.
For gamma-spectrometry measurement of 210Pb and 226Ra, 2-5 ml of freeze-dried and homogenized sediment was weighed and packed in a 6-cm diameter plastic Petri dish which then was sealed with electrical tape and packed in a sealed plastic envelope. Calibration and monitor standards and samples were prepared in the same geometry. Sealed sediment samples were left for a minimum of four weeks to establish radioactive equilibrium between 222Rn and 226Ra. Gamma activity was measured with a Canberra Broad Energy Range High Purity Germanium Detector (BEGe), using the 46.5 keV line for 210Pb and 295.2, 351.9 and 609.3 keV lines for 226Ra. The detector, connected to a computer via a Digital Spectrum Analyser (DSA-1000), counted the radionuclide activities with Genie 2000 gamma spectroscopy software. Samples were counted for 2–5 days to obtain good counting statistics or relative standard deviation (RSD). A blank (empty petri dish) was counted during 23 days. The detector was externally calibrated with a Geological Certified Reference Material IAEA/RGU-1, with reference date of 01-01-1988. A monitor standard IAEA-300 provided quality control. Excess 210Pb activities were calculated by subtracting 226Ra activity averaged for the 295.2, 351.9 and 609.3 keV lines from the measured total 210Pb activity.
Related to:
Haffert, Laura; Haeckel, Matthias; de Stigter, Henko; Janssen, Felix (2020): Assessing the temporal scale of deep-sea mining impacts on sediment biogeochemistry. Biogeosciences, 17(10), 2767-2789, https://doi.org/10.5194/bg-17-2767-2020
Coverage:
Median Latitude: -7.077206 * Median Longitude: -88.462444 * South-bound Latitude: -7.125400 * West-bound Longitude: -88.526350 * North-bound Latitude: -7.056217 * East-bound Longitude: -88.433767
Date/Time Start: 2015-08-02T21:27:28 * Date/Time End: 2015-08-22T04:21:40
Minimum DEPTH, sediment/rock: 0.005 m * Maximum DEPTH, sediment/rock: 0.310 m
Event(s):
SO242/1_108-1 (SO242/1_108-1_MUC 26) * Latitude: -7.074717 * Longitude: -88.448650 * Date/Time: 2015-08-18T00:08:10 * Elevation: -4169.1 m * Campaign: SO242/1 (JPI-OCEANS) * Basis: Sonne_2 * Method/Device: MultiCorer (MUC) * Comment: device position
SO242/1_129-1 (SO242/1_129-1_BC 26) * Latitude: -7.056217 * Longitude: -88.433767 * Date/Time: 2015-08-22T04:21:40 * Elevation: -4144.3 m * Campaign: SO242/1 (JPI-OCEANS) * Basis: Sonne_2 * Method/Device: Box corer (BC) * Comment: device position
SO242/1_34-1 (SO242/1_34-1_MUC 6) * Latitude: -7.125400 * Longitude: -88.450517 * Date/Time: 2015-08-02T21:27:28 * Elevation: -4161.7 m * Campaign: SO242/1 (JPI-OCEANS) * Basis: Sonne_2 * Method/Device: MultiCorer (MUC) * Comment: device position
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventde Stigter, Henko
2Depth, top/minDepth topmde Stigter, Henko
3Depth, bottom/maxDepth botmde Stigter, Henko
4DEPTH, sediment/rockDepthmde Stigter, HenkoGeocode
5Lead 210210PbBq/kgde Stigter, Henko46.5 keV
6Lead 210, error210Pb e±de Stigter, Henko1s
7Radium 226226RaBq/kgde Stigter, Henko295.2 keV
8Radium 226, error226Ra e±de Stigter, Henko1s
9Radium 226226RaBq/kgde Stigter, Henko351.9 keV
10Radium 226, error226Ra e±de Stigter, Henko1s
11Radium 226226RaBq/kgde Stigter, Henko609.3keV
12Radium 226, error226Ra e±de Stigter, Henko1s
13Radium 226226RaBq/kgde Stigter, Henkoaverage
Size:
451 data points

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