Radionuclide 210Pb and 226Ra data measured on sediment cores during SONNE cruise SO242/1
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2019
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| _version_ | 1867171864042799104 |
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| author | de Stigter, Henko |
| author_facet | de Stigter, Henko |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_905443 |
| institution | PANGAEA |
| language | en |
| publishDate | 2019 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Radionuclide 210Pb and 226Ra data measured on sediment cores during SONNE cruise SO242/1 de Stigter, Henko BC; Box corer; Date/Time of event; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elevation of event; Event label; JPI-OCEANS; JPI Oceans - Ecological Aspects of Deep-Sea Mining; JPIO-MiningImpact; Latitude of event; Lead-210; Lead-210, error; Longitude of event; MUC; MultiCorer; Optional event label; Radium-226; Radium-226, error; SO242/1; SO242/1_108-1; SO242/1_108-1_MUC 26; SO242/1_129-1; SO242/1_129-1_BC 26; SO242/1_34-1; SO242/1_34-1_MUC 6; SO242/1_56-1; SO242/1_56-1_MUC 12; SO242/1_61-1; SO242/1_61-1_MUC 13; SO242/1_70-1; SO242/1_70-1_MUC 17; SO242/1_74-1; SO242/1_74-1_MUC 20; SO242/1_80-1; SO242/1_80-1_MUC 22; Sonne_2 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. |
| title | Radionuclide 210Pb and 226Ra data measured on sediment cores during SONNE cruise SO242/1 |
| topic | BC; Box corer; Date/Time of event; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elevation of event; Event label; JPI-OCEANS; JPI Oceans - Ecological Aspects of Deep-Sea Mining; JPIO-MiningImpact; Latitude of event; Lead-210; Lead-210, error; Longitude of event; MUC; MultiCorer; Optional event label; Radium-226; Radium-226, error; SO242/1; SO242/1_108-1; SO242/1_108-1_MUC 26; SO242/1_129-1; SO242/1_129-1_BC 26; SO242/1_34-1; SO242/1_34-1_MUC 6; SO242/1_56-1; SO242/1_56-1_MUC 12; SO242/1_61-1; SO242/1_61-1_MUC 13; SO242/1_70-1; SO242/1_70-1_MUC 17; SO242/1_74-1; SO242/1_74-1_MUC 20; SO242/1_80-1; SO242/1_80-1_MUC 22; Sonne_2 |
| url | https://doi.org/10.1594/PANGAEA.905443 |