Status of 236U analyses at ETH Zurich and the distribution of 236U and 129I in the North Sea in 2009

Christl, Marcus; Casacuberta, Núria; Lachner, Johannes; Maxeiner, Sascha; Vockenhuber, Christof; Synal, Hans-Arno; Goroncy, I.; Herrmann, J.; Daraoui, A.; Walther, Clemens; Michel, R.

doi:10.1016/j.nimb.2015.01.005

Cited by 66 publications

(80 citation statements)

References 22 publications

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“…The high overall efficiency, the low background and the simplified measurement procedure at the 500 kV TANDY AMS facility of the Laboratory of Ion Beam Physics at ETH Zurich, Switzerland, allowed us to routinely measure 129 I since many years with the recent focus on determination of 129 I in irradiated materials [24], the distribution 129 I in the environment [10] and as an oceanic tracer, now in combination with 236 U [20,25]. On average we measure about 500-1000 unknown samples per year.…”

Section: Resultsmentioning

confidence: 99%

Accelerator Mass Spectrometry of 129I towards its lower limits

Vockenhuber

Casacuberta

Christl

et al. 2015

Nuclear Instruments and Methods in Physics Research Section B:

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Section: Resultsmentioning

confidence: 99%

Accelerator Mass Spectrometry of 129I towards its lower limits

Vockenhuber

Casacuberta

Christl

et al. 2015

Nuclear Instruments and Methods in Physics Research Section B:

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“…U was precipitated again, dried down, and pressed into Ti targets before their measurement. The measurement routine for 236 U measurements is given in Christl, Casacuberta, Lachner, et al () and comprises measurements of 233 U/ 238 U and 236 U/ 238 U atom ratios. The U ratios are normalized to the ETH Zürich in‐house standard ZUTRI with nominal isotopic ratios of (4,055 ± 203) × 10 −12 for 236 U/ 238 U and (33,170 ± 830) × 10 −12 for 233 U/ 238 U (Christl, Vockenhuber, et al, ).…”

Section: Methodsmentioning

confidence: 99%

Tracing Atlantic Waters Using ¹²⁹I and ²³⁶U in the Fram Strait in 2016

et al. 2019

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In this study 129I and 236U concentrations in seawater samples collected onboard R/V Polarstern during the PS100 expedition in the Fram Strait in 2016 are presented. The overall aim of the study was to investigate the distribution of these long‐lived radionuclides along the transect located at 79°N. The combination of both radionuclides was used for the first time in the Fram Strait to trace ocean circulation pathways of Atlantic waters. Results show that both 129I and 236U concentrations as well as 236U/238U ratios are about two times higher (> 600 × 107 at kg(−1), > 20 × 106 at kg(−1), and 2.8 × 10−9, respectively) in the cold and fresh outflowing surface waters from the Arctic Ocean (Polar Surface Water, PSW) compared to inflowing Atlantic origin waters (300 × 107 at kg(−1) 129I, 12 × 106 at kg(−1) 236U, and 1.4 × 10−9 236U/238U). A comparison with the different 129I and 236U input functions for the Atlantic branches entering the Arctic Ocean reveals that the middepth Atlantic origin waters outflowing the Arctic Ocean show more influence of the Barents Sea Branch Water than the Fram Strait Branch Water. The high radionuclide concentrations observed in the PSW indicate substantial influence of the Norwegian Coastal Current. This current carries a significantly larger proportion of 129I and 236U releases from European reprocessing plants than the aforementioned Atlantic branches. We estimate surface water transit times from the northern Norwegian Coast through the Arctic to the PSW of 12–19 years, less than for the middepth Barents Sea Branch Water (16–23 years).

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“…Pioneering work was performed in the Japan Sea by [13] and in the open Atlantic Ocean by [14]. Recently, much larger data sets have been produced in the North Sea and Atlantic Ocean [11,15].…”

Section: Introductionmentioning

confidence: 99%