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  • 1
    Online Resource
    Online Resource
    Optimierte Lichtsysteme zur Verbesserung von Leistungsfähigkeit und Gesundheit (OLIVE) : Schlussbericht der technischen Teilvorhaben im Verbundprojekt : Teilvorhaben: Modularer Baukasten für biologisch wirksame, energieeffiziente Leuchten und selbstorganisierende Steuerungs- / Sensornetzwerke : Laufzeit des Vorhabens: 01.08.2014-31.08.2017 (2018)
    [Arnsberg] : [ITZ Innovations- und Technologiezentrum GmbH]
    Details Availability
    Keywords: Forschungsbericht ; Lichttechnik ; Lumineszenzdiode ; Steuerungstechnik ; Chronobiologie
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (26 Seiten, 1,4 MB) , Illustrationen, Diagramme
    URL: https://doi.org/10.2314/GBV:1015796109
    DOI: 10.2314/GBV:1015796109
    Language: German
    Note: Förderkennzeichen BMBF 13N13156-13N13159 - 13N13161. - Verbund-Nummer 01154820 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden
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    GEOMAR CATALOGUE
    Link to Library Catalog
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  • 2
    Online Resource
    Online Resource
    Innovationsforum "Licht # Digitalisierung" (InnoLiD) : Schlussbericht zum Vorhaben : Laufzeit des Vorhabens: 01.01.2018 - 31.09.2018 (2019)
    Arnsberg : Lichtforum NRW GmbH
    Details Availability
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (32 Seiten, 1,13 MB) , Diagramme
    URL: https://doi.org/10.2314/KXP:1671003403
    DOI: 10.2314/KXP:1671003403
    Language: German
    Note: Förderkennzeichen BMBF 01MI1720 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden
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    GEOMAR CATALOGUE
    Link to Library Catalog
    get availability status
  • 3
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    Alpha radiation from polymetallic nodules and potential health risks from deep-sea mining (2023)
    Nature Research
    Details
    Publication Date: 2024-02-07
    Description: In search for critical elements, polymetallic nodules at the deep abyssal seafloor are targeted for mining operations. Nodules efficiently scavenge and retain several naturally occurring uranium-series radioisotopes, which predominantly emit alpha radiation during decay. Here, we present new data on the activity concentrations of thorium-230, radium-226, and protactinium-231, as well as on the release of radon-222 in and from nodules from the NE Pacific Ocean. In line with abundantly published data from historic studies, we demonstrate that the activity concentrations for several alpha emitters are often higher than 5 Bq g −1 at the surface of the nodules. These observed values can exceed current exemption levels by up to a factor of 1000, and even entire nodules commonly exceed these limits. Exemption levels are in place for naturally occurring radioactive materials (NORM) such as ores and slags, to protect the public and to ensure occupational health and radiation safety. In this context, we discuss three ways of radiation exposure from nodules, including the inhalation or ingestion of nodule fines, the inhalation of radon gas in enclosed spaces and the potential concentration of some radioisotopes during nodule processing. Seen in this light, inappropriate handling of polymetallic nodules poses serious health risks.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Radon (222Rn) as tracer for submarine groundwater discharge investigation — limitations of the approach at shallow wind-exposed coastal settings (2022)
    Springer
    Details
    Publication Date: 2024-02-07
    Description: Mapping radon (222 Rn) distribution patterns in the coastal sea is a widely applied method for localizing and quantifying submarine groundwater discharge (SGD). While the literature reports a wide range of successful case studies, methodical problems that might occur in shallow wind-exposed coastal settings are generally neglected. This paper evaluates causes and effects that resulted in a failure of the radon approach at a distinct shallow wind-exposed location in the Baltic Sea. Based on a simple radon mass balance model, we discuss the effect of both wind speed and wind direction as causal for this failure. We show that at coastal settings, which are dominated by gentle submarine slopes and shallow waters, both parameters have severe impact on coastal radon distribution patterns, thus impeding their use for SGD investigation. In such cases, the radon approach needs necessarily to allow for the impact of wind speed and wind direction not only during but also prior to the field campaign.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Radionuclide activities for sediment core SO268/2_125-1 (MUC-25) at a disturbed site after a small-scale dredge experiment during RV SONNE cruise SO268/2 in the CCZ, Pacific Ocean (2022)
    PANGAEA
    Details
    Publication Date: 2024-02-26
    Description: This dataset comprises downcore measurements of the activity of different radionuclides for a sediment core (MUC) retrieved from disturbed sites after a small-scale dredge experiment in the framework of the European collaborative JPI Oceans MiningImpact project onboard R/V SONNE cruise SO268 in 2019. The scientific work during cruise SO268 was part of the second phase of the MiningImpact project (Environmental impacts and risks of deep-sea mining) and is designed to assess the environmental impacts of deep-sea mining of polymetallic nodules in the Clarion-Clipperton Zone (CCZ) in the Pacific Ocean. After performing total acid digestions, the sediments were analyzed by isotope dilution using ICP-SF-MS (Element2, Thermo Scientific) for the determination of radionuclides at the Marine Geochemistry Lab, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven.
    Keywords: Anthropogenic disturbances; Area/locality; AWI_MarGeoChem; Clarion-Clipperton Fraction Zone, North East Pacific Ocean; Clarion Clipperton Fracture Zone; Core; deep sea mining; deep sea sediment; DEPTH, sediment/rock; Geochemical data; ICP-SF-MS, Thermo Scientific, Element 2; JPI Oceans - Ecological Aspects of Deep-Sea Mining; JPIO-MiningImpact; Marine Geochemistry @ AWI; MUC-25; Multicorer with television; Salt-corrected; SO268/2; SO268/2_125-1; Sonne_2; Station label; Thorium-230; Thorium-230, error; Thorium-230, supported; Thorium-230 excess; Thorium-230 excess, error; Thorium-232; Thorium-232, error; TVMUC; Uranium-234; Uranium-234, error; Uranium-235; Uranium-235, error; Uranium-238; Uranium-238, error
    Type: Dataset
    Format: text/tab-separated-values, 435 data points
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    DATA PANGAEA
  • 6
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    Radon emanation from polymetallic nodules from the CCZ collected during SONNE cruises SO239 and SO268/2 (2022)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Description: This dataset comprises radon concentrations emanated from four polymetallic nodules of different sizes from the CCZ. The nodules were collected in the framework of the European collaborative JPI Oceans MiningImpact project onboard R/V SONNE cruises SO239 in 2015 and SO268 in 2019. Radon emanation was measured by enclosing the nodules in a glass chamber (volume = 2.02 L) while continuously circulating the gas in the system through a Rad7 device (Durrige Inc.), which is designed to measure specifically radon. As comparison, a 4.6 Bq Ra-226 standard was analyzed. The concentrations were evaluated with the Capture® software.
    Keywords: AWI_MarGeoChem; BC; BC20; BC31; BC9; Box corer; Calculated; calculated, 2 sigma; Clarion-Clipperton Fraction Zone, North East Pacific Ocean; Clarion Clipperton Fracture Zone; Dredge; DRG; DRG-01; Emanated; Event label; isotope data; JPI Oceans - Ecological Aspects of Deep-Sea Mining; JPIO-MiningImpact; Marine Geochemistry @ AWI; North Pacific Ocean; polymetallic nodules; Radioactivity; Radon-222; Radon-222, uncertainty; Sample code/label; SO239; SO239_119-1; SO239_195-1; SO239_60-1; SO268/2; SO268/2_119-1; Sonne_2; Time in hours
    Type: Dataset
    Format: text/tab-separated-values, 750 data points
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    DATA PANGAEA
  • 7
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    Distribution of radioisotopes in polymetallic nodules from the CCZ collected during SONNE cruise SO239 (2022)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Description: 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.
    Keywords: AWI_MarGeoChem; BC; BC20; BC28; BC31; BC9; Box corer; Clarion Clipperton Fracture Zone; Depth, bottom/max; Depth, top/min; Event label; isotope data; JPI Oceans - Ecological Aspects of Deep-Sea Mining; JPIO-MiningImpact; Lead-210; Lead-210, error; Marine Geochemistry @ AWI; North Pacific Ocean; polymetallic nodules; Protactinium-231; Protactinium-231, error; Radioactivity; Radium-226; Radium-226, error; Radon-222; Radon-222, error; Sample code/label; Sample mass; Sample type; SO239; SO239_119-1; SO239_180-1; SO239_195-1; SO239_60-1; SO239_88-1; Sonne_2; Thorium-230; Thorium-230, error; Time in seconds; Uranium-234; Uranium-234, error
    Type: Dataset
    Format: text/tab-separated-values, 440 data points
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    DATA PANGAEA
  • 8
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    The analysis of 226Ra in 1‐liter seawater by isotope dilution via single‐collector sector‐field ICP‐MS (2021)
    In:  EPIC3Limnology and Oceanography: Methods, ISSN: 1541-5856
    Details
    Publication Date: 2021-05-01
    Description: The precise determination of radium‐226 (226Ra) in environmental samples is challenging due to its low concentration. Seawater typically contains between 0.03 and 0.1 fg g−1 226Ra. Thus, this work addresses the need for an easy and precise methodology for 226Ra determination in seawater that may be applied routinely to a large number of samples. For this reason, a new analytical approach has been developed for the quantification of 226Ra in seawater via inductively coupled plasma mass spectrometry (ICP‐MS). Analysis by single collector sector‐field ICP‐MS was shown to be convenient and reliable for this purpose once potential molecular interferences were excluded by a combination of chemical separation and intermediate mass resolution analysis. The proposed method allows purification of Ra from the sample matrix based on preconcentration by MnO2 precipitation, followed by two‐column separation using a cation exchange resin and an extraction chromatographic resin. The method can be applied to acidified and unacidified seawater samples. The recovery efficiency for Ra ranged between 90% and 99.8%, with precision of 5%, accuracy of 95.7% to 99.9%, and a detection limit of 0.033 fg g−1 (referring to the original concentration of seawater). The method has been applied to measure 226Ra concentrations from the North Sea and validated by analyzing samples from the central Arctic (GEOTRACES GN04). Samples from a crossover station (from GEOTRACES GN04 and GEOTRACES GN01 research cruises) were analyzed using alternative methods, and our results are in good agreement with published values.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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    PAPER (OA)
  • 9
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    Submariner Grundwasserausstrom im Sahlenburger Watt Regionale Verteilung und Einflüsse auf die Porenwasserchemie (2014)
    In:  EPIC388 p.
    Details
    Publication Date: 2015-01-14
    Description: 1 Kurzfassung Im Sahlenburger Wattenmeer südwestlich von Cuxhaven wurde eine Porenwasseranalyse auf- Anionen, Kationen und Nährstoffe sowie eine geoelektrische Kartierung nach Wenner zur Untersuchung des dort vorkommenden submarinen Grundwasserausstromes durchgeführt. Zudem fand an mehreren diskreten Ausstromstellen (sand boils) eine Größenkartierung sowie Volumenstromessung mittels Seapagemetern statt. Zielsetzung war es Fragen hinsichtlich der räumlichen und zeitlichen Variabilität sowie der Anreicherung durch den submarinen Grundwasserausstrom eingetragener Spezies zu beantworten. Ebenfalls von Bedeutung war die hydrogeologische Bilanz im Untersuchungsgebiet mit dem Grundwasserausstrom als potentiellem Verlustweg sowie die Ursache für dessen Auftreten. Es konnte im Rahmen dieser Untersuchung bestätigt werden, dass große Teile des Sahlenburger Wattenmeeres durch Süßwassereintrag sowie Akkumulation gelöster Spezies infolge des submarinen Grundwasserausstromes geprägt sind. Zudem konnte nachgewiesen werden, dass der Grundwasserausstrom über mehrere Jahre nahezu ortsstabil geblieben ist sowie eine zuvor postulierte wasserstauende Torf- und Kleischicht im Untergrund Hauptursache für dessen Auftreten sowie räumliche Verteilung ist. Abschließend erfolgte über einen Zusammenhang zwischen der Größe einer Ausstromstelle sowie dem ausströmenden Volumen eine hydrogeologische Bilanzierung.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Thesis , notRev
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    PAPER (OA)
  • 10
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    The analysis of 226Ra in 1‐liter seawater by isotope dilution via single‐collector sector‐field ICP‐MS (2021)
    John Wiley & Sons, Inc. | Hoboken, USA
    Details
    Publication Date: 2021-06-23
    Description: The precise determination of radium‐226 (226Ra) in environmental samples is challenging due to its low concentration. Seawater typically contains between 0.03 and 0.1 fg g−1 226Ra. Thus, this work addresses the need for an easy and precise methodology for 226Ra determination in seawater that may be applied routinely to a large number of samples. For this reason, a new analytical approach has been developed for the quantification of 226Ra in seawater via inductively coupled plasma mass spectrometry (ICP‐MS). Analysis by single collector sector‐field ICP‐MS was shown to be convenient and reliable for this purpose once potential molecular interferences were excluded by a combination of chemical separation and intermediate mass resolution analysis. The proposed method allows purification of Ra from the sample matrix based on preconcentration by MnO2 precipitation, followed by two‐column separation using a cation exchange resin and an extraction chromatographic resin. The method can be applied to acidified and unacidified seawater samples. The recovery efficiency for Ra ranged between 90% and 99.8%, with precision of 5%, accuracy of 95.7% to 99.9%, and a detection limit of 0.033 fg g−1 (referring to the original concentration of seawater). The method has been applied to measure 226Ra concentrations from the North Sea and validated by analyzing samples from the central Arctic (GEOTRACES GN04). Samples from a crossover station (from GEOTRACES GN04 and GEOTRACES GN01 research cruises) were analyzed using alternative methods, and our results are in good agreement with published values.
    Description: Helmholtz Association http://dx.doi.org/10.13039/501100009318
    Keywords: 551.9 ; seawater ; radium-226 determination
    Type: article
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    CITATION GEO-LEO
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