Volz, Jessica B; Geibert, Walter; Koehler, Dennis; Rutgers van der Loeff, Michiel M; Kasten, Sabine (2022): Distribution of radioisotopes in polymetallic nodules from the CCZ collected during SONNE cruise SO239 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.951145
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Published: 2022-11-21 • DOI registered: 2023-01-03
Abstract:
This dataset comprises gamma spectrometric measurements of radioisotopes in samples from polymetallic nodules, which were collected in the framework of the European collaborative JPI Oceans MiningImpact project onboard R/V SONNE cruise SO239 in 2015. Samples were taken from different parts of the nodules (topside surface (s), bottom surface (b), interior (i)). The gamma radiation was measured in a Canberra well-type HPGe detector. Emission lines at 46 keV (Pb-210), 63 keV (U-234 via Th-234), 67 keV (Th-230), 186 keV (Ra-226 in absence of U-235 interference), 295 keV (Ra-226 via Rn-222) and 402 keV (Pa-231 via Rn-219 with some uncertainty on the intermediate Pa-231/Ac-227 equilibrium) were evaluated. The diluted uranium ore standard RGU-1 and the uranium ore standard UREM-11 served as calibration and reference, respectively.
Supplement to:
Volz, Jessica B; Geibert, Walter; Koehler, Dennis; Rutgers van der Loeff, Michiel M; Kasten, Sabine (2023): Alpha radiation from polymetallic nodules and potential health risks from deep-sea mining. Scientific Reports, 13(1), 7985, https://doi.org/10.1038/s41598-023-33971-w
Project(s):
JPI Oceans - Ecological Aspects of Deep-Sea Mining (JPIO-MiningImpact)
Marine Geochemistry @ AWI (AWI_MarGeoChem)
Funding:
Federal Ministry of Education and Research (BMBF), grant/award no. 03F0812F: JPI-O MiningImpact: Auswirkungen von Manganknollenbergbau auf biogeochemische Prozesse und die Ausbreitung von Stoffen in der Tiefsee
Coverage:
Median Latitude: 13.916668 * Median Longitude: -123.792066 * South-bound Latitude: 11.079000 * West-bound Longitude: -130.136330 * North-bound Latitude: 18.795830 * East-bound Longitude: -117.550330
Date/Time Start: 2015-03-29T04:18:00 * Date/Time End: 2015-04-21T20:08:00
Minimum Elevation: -4936.4 m * Maximum Elevation: -4324.5 m
Event(s):
SO239_60-1 (BC9) * Latitude: 11.807670 * Longitude: -117.550330 * Date/Time: 2015-03-29T04:18:00 * Elevation: -4324.5 m * Location: North Pacific Ocean * Campaign: SO239 * Basis: Sonne_2 * Method/Device: Box corer (BC) * Comment: German BGR
Comment:
RGU-1 (400 ppm U) was used for calibration. Except for U (186 keV!), activities are very similar to nodules.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Volz, Jessica B | |||
| 2 | Sample code/label | Sample label | Volz, Jessica B | |||
| 3 | Depth, top/min | Depth top | m | Volz, Jessica B | ||
| 4 | Depth, bottom/max | Depth bot | m | Volz, Jessica B | ||
| 5 | Sample type | Samp type | Volz, Jessica B | nodule | ||
| 6 | Sample mass | Samp m | g | Volz, Jessica B | ||
| 7 | Time in seconds | Time sec | s | Volz, Jessica B | Counting time | |
| 8 | Lead-210 | 210Pb | dpm/g | Volz, Jessica B | 46 keV | |
| 9 | Lead-210, error | 210Pb e | ± | Volz, Jessica B | 1 s error (only counting, absolute units) | |
| 10 | Uranium-234 | 234U | dpm/g | Volz, Jessica B | via 234Th (63 keV) | |
| 11 | Uranium-234, error | 234U e | ± | Volz, Jessica B | 1 s error (only counting, absolute units) | |
| 12 | Thorium-230 | 230Th | dpm/g | Volz, Jessica B | 67 keV; Unfortunate, probably random peak deconvolution for 230Th (see measured vs. expected value for UREM-11) | |
| 13 | Thorium-230, error | 230Th e | ± | Volz, Jessica B | 1 s error (only counting, absolute units) | |
| 14 | Radium-226 | 226Ra | dpm/g | Volz, Jessica B | 186 keV; For RGU-1 and UREM-11, this gamma line has a 235U interference (see measured vs. expected value for UREM-11) but not for the nodules. Good correlation of 226Ra (direct) vs. 226Ra (via 222Rn) for nodules, but precision is only 70% | |
| 15 | Radium-226, error | 226Ra e | ± | Volz, Jessica B | 1 s error (only counting, absolute units) | |
| 16 | Radium-226 | 226Ra | dpm/g | Volz, Jessica B | via 222Rn (295 keV); Best value for 226Ra | |
| 17 | Radium-226, error | 226Ra e | ± | Volz, Jessica B | 1 s error (only counting, absolute units) | |
| 18 | Radon-222 | 222Rn | dpm/g | Volz, Jessica B | 351 keV; values with #: 2 peaks manually added | |
| 19 | Radon-222, error | 222Rn e | ± | Volz, Jessica B | 1 s error (only counting, absolute units) | |
| 20 | Protactinium-231 | 231Pa | dpm/g | Volz, Jessica B | 227Ac, 219Rn 6.7% (402 keV); Gamma line for 231Pa chosen based on Geibert, W. (2001): Actinium-227 als Tracer für Advektion und Mischung in der Tiefsee , PhD thesis, Universität Bremen. Some uncertainty on the intermediate 231Pa/227Ac equilibrium | |
| 21 | Protactinium-231, error | 231Pa e | ± | Volz, Jessica B | 1 s error (only counting, absolute units) | |
| 22 | Radon-222 | 222Rn | dpm/g | Volz, Jessica B | 609 keV | |
| 23 | Radon-222, error | 222Rn e | ± | Volz, Jessica B | 1 s error (only counting, absolute units) |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
440 data points