236U analyses with the ETH Zurich MILEA prototype system

Christl, Marcus; Gautschi, Philip; Maxeiner, Sascha; Müller, Arnold; Vockenhuber, Christof; Synal, Hans-Arno

doi:10.1016/j.nimb.2022.11.009

Cited by 5 publications

(4 citation statements)

References 39 publications

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“…Samples were measured as 233 U/ 238 U and 236 U/ 238 U at LIP on the 300 kV Multi‐Isotope Low Energy AMS (MILEA) system using in‐house standard “ZUTRI” using correction procedures as outlined in Christl et al. (2023). Concentrations of both 236 U and 238 U were calculated from the measured concentration of the 233 U spike, including an uncertainty for the added quantity of spike.…”

Section: Methodsmentioning

confidence: 99%

“…Seawater samples for the measurement of uranium isotopes were spiked with 1pg 233 U, preconcentrated, purified by ion exchange chromatography using UTEVA ® (Triskem International) resin columns, oxidized and pressed into AMS targets in the method described by Wefing (2021). Samples were measured as 233 U/ 238 U and 236 U/ 238 U at LIP on the 300 kV Multi-Isotope Low Energy AMS (MILEA) system using in-house standard "ZUTRI" using correction procedures as outlined in Christl et al (2023). Concentrations of both 236 U and 238 U were calculated from the measured concentration of the 233 U spike, including an uncertainty for the added quantity of spike.…”

Section: Sample Processing and Measurementmentioning

confidence: 99%

“…In particular, the long half‐life of 129 I (15.7 Ma) and 236 U (23.4 Ma) along with their conservative behavior (Aldahan et al., 2007; Sakaguchi et al., 2012), high concentration relative to natural sources and well‐defined but differing transient release histories into the northeast Atlantic domain (Casacuberta et al., 2018; Christl et al., 2015; Wefing et al., 2021), make them ideal tracers for investigating oceanic transport processes in the Arctic Ocean and SPNA (e.g., Casacuberta & Smith, 2023 and references therein). Recent developments in Accelerator Mass Spectrometry (AMS) have made it possible to measure these radionuclides in concentrations in the order of 1 × 10 6 at/kg of seawater (Casacuberta et al., 2016) with uncertainties of less than 3% (Christl et al., 2013, 2023; Vockenhuber et al., 2015), which is crucial for distinguishing natural from anthropogenic levels of 236 U.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tracing Ocean Circulation and Mixing From the Arctic to the Subpolar North Atlantic Using the ¹²⁹I–²³⁶U Dual Tracer

Dale,

Christl,

Vockenhuber

et al. 2024

JGR Oceans

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This study represents the first use of the artificial radionuclides 129I and 236U, released into the ocean mainly from Nuclear Reprocessing Plants, as a dual tracer in the vicinity of Iceland with novel estimation of ocean circulatory pathways and mixing in the region. Iceland lies at the gateway to the Arctic where warm, saline Atlantic waters interact with waters of Arctic origin in ways that have critical consequences for the strength and stability of the Atlantic Meridional Overturning Circulation. Many of these interactions are not yet fully understood, such as how Atlantic water circulates around the Arctic Ocean and Nordic Seas and the composition and fate of the major overflows of the Greenland‐Scotland Ridge. Using new and previous measurements of 129I and 236U in seawater, we present a new method of appraising water mass provenance and mixing in the form of the 129I–236U dual mixing plot. With this method, we estimate that at least half the Atlantic‐origin water entering the Arctic Ocean circulates around the Canada Basin before exiting at Fram Strait and that this outflow is increased by about 40% by mixing with Return Atlantic Water “short‐circuiting” the Arctic Ocean at Fram Strait. We present tracer‐based evidence that water carried by the East Greenland Current has an unbroken pathway to the Faroe‐Shetland Channel and that Iceland‐Scotland Overflow Water (ISOW) entrains 60% Labrador Sea Water during transit past southeast Iceland. We present an unambiguous way to differentiate ISOW from DSOW after they partially merge in the Irminger Sea.

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Section: Methodsmentioning

confidence: 99%

Section: Sample Processing and Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tracing Ocean Circulation and Mixing From the Arctic to the Subpolar North Atlantic Using the ¹²⁹I–²³⁶U Dual Tracer

Dale,

Christl,

Vockenhuber

et al. 2024

JGR Oceans

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“…These can be broadly divided into two types: Low energy tandem accelerators, using high voltage terminal voltages of between 200 kV (Fig. 3 ) [ 17 – 19 ] and 300 kV [ 20 – 22 ]. Due to the shorter distance to the accelerator terminal and vacuum tubes with a larger bore, such instruments can provide better transmission efficiency through the accelerator than larger systems.…”

Section: Sustainability In Ams Technologymentioning

confidence: 99%

Accelerator mass spectrometry: an analytical tool with applications for a sustainable society

Kieser

2023

EPJ Techn Instrum

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Accelerator Mass Spectrometry (AMS) adds the techniques of higher energy charged particle acceleration to the basic principles of Isotope Ratio Mass Spectrometry (IRMS) to provide extremely low detection capability (below 1 femtogram) of rare isotopes in samples of natural materials as small as 1 mg. Depending on the element selected and the configuration of the equipment, rare isotope sensitivities can reach less than one part in 1015. The advantages of this small sample size and high sensitivity for the detection of rare isotopes include a) the economic benefit of collecting, shipping and preparing much smaller samples, and b) the ability to analyse specific chemical compounds within the sample. For the latter advantage, the pathway taken by that compound through a complex system can be more precisely traced or, in the case of radioactive isotopes, more precise chronological information can be provided. The paper is an amplification of material which was presented at the IAEA International Conference on Accelerators for Research and Sustainable Development: novel concepts and technical innovation. It begins with a basic overview of AMS technology, with an emphasis on how the use of higher energy contributes to this enhanced sensitivity, and then provides several examples of new AMS technologies which reduce the energy and space requirements for such systems. Several examples of applications which contribute to the investigation of sustainability in other areas of environmental concern are then briefly described.

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Validation and improvement of curium radiochronometry to determine the model discharge date of spent nuclear fuels

Guérin,

Christl,

Gagné

et al. 2024

J Radioanal Nucl Chem

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236U analyses with the ETH Zurich MILEA prototype system

Cited by 5 publications

References 39 publications

Tracing Ocean Circulation and Mixing From the Arctic to the Subpolar North Atlantic Using the ¹²⁹I–²³⁶U Dual Tracer

Tracing Ocean Circulation and Mixing From the Arctic to the Subpolar North Atlantic Using the ¹²⁹I–²³⁶U Dual Tracer

Accelerator mass spectrometry: an analytical tool with applications for a sustainable society

Validation and improvement of curium radiochronometry to determine the model discharge date of spent nuclear fuels

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236U analyses with the ETH Zurich MILEA prototype system

Cited by 5 publications

References 39 publications

Tracing Ocean Circulation and Mixing From the Arctic to the Subpolar North Atlantic Using the 129I–236U Dual Tracer

Tracing Ocean Circulation and Mixing From the Arctic to the Subpolar North Atlantic Using the 129I–236U Dual Tracer

Accelerator mass spectrometry: an analytical tool with applications for a sustainable society

Validation and improvement of curium radiochronometry to determine the model discharge date of spent nuclear fuels

Contact Info

Product

Resources

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Tracing Ocean Circulation and Mixing From the Arctic to the Subpolar North Atlantic Using the ¹²⁹I–²³⁶U Dual Tracer

Tracing Ocean Circulation and Mixing From the Arctic to the Subpolar North Atlantic Using the ¹²⁹I–²³⁶U Dual Tracer