Radionuclide data (total 210Pb) measured on sediment multi cores during SONNE cruise SO242/1 at the DISCOL area, Peru Basin
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2019
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| _version_ | 1867170094730182656 |
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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 alpha spectrometry measurement of 210Po, 0.5 g of freeze-dried and homogenised sediment contained in a plastic reaction tube was spiked with 1 ml of a standard solution of 209Po in 2M HCl, and then leached for 6 h in 10 ml of concentrated HCl heated to 85ºC. After diluting the fluid with 45 ml of demineralised water and adding 5 ml of an aqueous solution of ascorbic acid (40 g L-1), natural 210Po and added 209Po were collected from the fluid by spontaneous electrochemical deposition on silver plates, which were suspended in the fluid for at least 16 h while the fluid was heated to 70ºC. The Po isotopes collected on the silver plates were then measured by alpha-spectrometry using Canberra Passivated Implanted Planar Silicon detectors, with a count time of 1 day sufficient to reduce counting error to < 3%. 210Pb activity was calculated from 210Po, assuming secular equilibrium and correcting for the time elapsed since collection of the samples. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_905442 |
| institution | PANGAEA |
| language | en |
| publishDate | 2019 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Radionuclide data (total 210Pb) measured on sediment multi cores during SONNE cruise SO242/1 at the DISCOL area, Peru Basin 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; SO242/1; SO242/1_108-1; SO242/1_108-1_MUC 26; SO242/1_119-1; SO242/1_119-1_MUC 31; 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 alpha spectrometry measurement of 210Po, 0.5 g of freeze-dried and homogenised sediment contained in a plastic reaction tube was spiked with 1 ml of a standard solution of 209Po in 2M HCl, and then leached for 6 h in 10 ml of concentrated HCl heated to 85ºC. After diluting the fluid with 45 ml of demineralised water and adding 5 ml of an aqueous solution of ascorbic acid (40 g L-1), natural 210Po and added 209Po were collected from the fluid by spontaneous electrochemical deposition on silver plates, which were suspended in the fluid for at least 16 h while the fluid was heated to 70ºC. The Po isotopes collected on the silver plates were then measured by alpha-spectrometry using Canberra Passivated Implanted Planar Silicon detectors, with a count time of 1 day sufficient to reduce counting error to < 3%. 210Pb activity was calculated from 210Po, assuming secular equilibrium and correcting for the time elapsed since collection of the samples. |
| title | Radionuclide data (total 210Pb) measured on sediment multi cores during SONNE cruise SO242/1 at the DISCOL area, Peru Basin |
| 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; SO242/1; SO242/1_108-1; SO242/1_108-1_MUC 26; SO242/1_119-1; SO242/1_119-1_MUC 31; 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.905442 |