Analysis of radioxenon and Krypton-85 at the BfS noble gas laboratory

Schlosser, C.; Bollhöfer, Andreas; Schmid, Sabine; Krais, Roman; Bieringer, J.; Konrad, Martina

doi:10.1016/j.apradiso.2016.12.043

Cited by 17 publications

(6 citation statements)

References 14 publications

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“…For 85 Kr, the isotopic abundance of the reference gas was determined by LLC at University of Bern to be 32.1 (12) dpm/cm 3 [equivalent to 85 Kr /Kr = 9.7(4) × 10 −12 ] as of March 3, 2016. The reference gas was recently validated by an inter-laboratory comparison [56]. Additionally, the University of Bern has also provided TRACER a series of samples spanning over an order of magnitude in 85 Kr isotopic abundances, to validate the linearity of the measurement technique [52,55].…”

Section: Experimental Methods B: Detection Of Reaction Productsmentioning

confidence: 99%

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Stellar s -process neutron capture cross sections on Kr78,80,84,86 determined via activation, atom trap trace analysis, and deca

et al. 2021

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of massive and low-mass stars. The heavier stable isotopes 84,86 Kr are also subject to a substantial contribution from the r process (see [6] for a recent estimate). On the other hand, two of its lighter isotopes, 80,82 Kr, shielded from the r process by 80,82 Se, are pure s-process nuclides making their natural abundances [7-9] solid anchors for the validation of s-process models (see [6] and references therein). The determination of Kr solar abundances via analysis of primitive meteorites (C1 carbonaceous chondrites) is, however, difficult, and Kr isotopic composition in meteorites is considered a prominent anomalous case in the s-process pattern [10,11]. The few Kr measurements on acid residues of SiC presolar grains [12] have been theoretically interpreted as a mix between solar material and nucleosynthesis products of asymptotic giant branch (AGB) stars [13].

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Section: Experimental Methods B: Detection Of Reaction Productsmentioning

confidence: 99%

“…A background spectrum with Kr-free P10 gas is subtracted for calculating the net count rate. The counting efficiency in the energy range 4-35 keV is 48.4(4)% (see [56]). The amount of Kr in the counter was determined after the activity measurement by mass spectrometry (Table III).…”

Section: Experimental Methods B: Detection Of Reaction Productsmentioning

confidence: 99%

Stellar s -process neutron capture cross sections on Kr78,80,84,86 determined via activation, atom trap trace analysis, and deca

et al. 2021

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“…The krypton is then released from the charcoal trap and the enriched gas sample is sent to the laboratories of the Bundesamt für Strahlenschutz (Federal Office for Radiation Protection), in Freiburg, Germany. Here, the krypton fraction is separated by gas chromatography and transferred into gas proportional counters to determine the 85 Kr activity of the sample via decay counting [7] . The measurement uncertainty of this 85 Kr analysis method is about 3%.…”

Section: Methods Detailsmentioning

confidence: 99%

Modelling 85Kr datasets with python for applications in tracer hydrology and to investigate atmospheric circulation

2021

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We present a model written in python to evaluate data from comprehensive 85 Kr collection schemes comprising 11 datasets from different monitoring stations around the globe. The model is designed to (1) calculate atmospheric input functions for the application of 85 Kr as a dating tracer and (2) to investigate atmospheric circulation based on a two-box model of the atmosphere. Different functions were implemented, to (1) filter the data, (2) fit polynomials and running means, (3) extrapolate fits from the northern to the southern hemisphere, (4) calculate interhemispheric exchange times and 85 Kr emission rates and (5) export data to a csv file. Although the model is designed to evaluate atmospheric 85 Kr datasets, some functionality and basic concepts can be applied to other dating tracers, like tritium and SF 6 . Standardized method to systematically analyse atmospheric 85 Kr activity concentration time series for dating water and ice and to investigate atmospheric circulation. Easily modifiable python script to adapt functions for similar data analysis procedures.

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“…Due to the extremely low concentrations of 85 Kr in the atmosphere (isotopic abundance ∼ 2 × 10 −11 ), large amounts of air (10 m 3 in one week) are needed. 20,21 It is possible to measure smaller air samples (a few liters) in underground low level counting (LLC) laboratories. However, the long measurement time (a few days) limits the throughput and online operations.…”

Section: Introductionmentioning

confidence: 99%