Interlaboratory study of the ion source memory effect in 36Cl accelerator mass spectrometry

Pavetich, Stefan; Akhmadaliev, Shavkat; Arnold, Maurice; Aumaître, Georges; Bourlès, Didier; Buchriegler, Josef; Golser, Robin; Keddadouche, Karim; Martschini, Martin; Merchel, Silke; Rugel, G.; Steier, Peter

doi:10.1016/j.nimb.2014.02.130

Cited by 22 publications

(18 citation statements)

References 28 publications

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“…Additionally, the base level increases slowly over time during a measurement with several high samples and decreases only with a longer time constant (t 1/2 $ 1 h). Similar effects have been observed also for other volatile AMS nuclides like 36 Cl in certain ion sources [21]. This behavior can qualitatively be explained by contamination of the sample surface when it is in the ion source but not sputtered (leading to a short time constant) and general contamination of the parts in the ion source (longer time constant).…”

Section: Cross Talk and Measurement Sequencesupporting

confidence: 74%

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: Cross Talk and Measurement Sequencesupporting

confidence: 74%

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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“…The separated fractions were further purified from their respective isobars and finally converted to oxides (BeO, Al 2 O 3 , MnO 2 , Fe 2 O 3 ) and fluorides (CaF 2 ). The 10 Be/ 9 Be, 26 Al/ 27 Al,36 Cl/ 35 Cl, and 41 Ca/ 40 Ca ratios were measured at the Dresden AMS facility (DREAMS) at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR, Germany; Akhmadaliev et al 2013;Pavetich et al 2016;Rugel et al 2016).…”

Section: Cosmogenic Radionuclidesmentioning

confidence: 99%

The constancy of galactic cosmic rays as recorded by cosmogenic nuclides in iron meteorites

Smith

Cook

Merchel

et al. 2019

Meteorit & Planetary Scien

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We measured the He, Ne, and Ar isotopic concentrations and the 10Be, 26Al, 36Cl, and 41Ca concentrations in 56 iron meteorites of groups IIIAB, IIAB, IVA, IC, IIA, IIB, and one ungrouped. From 41Ca and 36Cl data, we calculated terrestrial ages indistinguishable from zero for six samples, indicating recent falls, up to 562 ± 86 ka. Three of the studied meteorites are falls. The data for the other 47 irons confirm that terrestrial ages for iron meteorites can be as long as a few hundred thousand years even in relatively humid conditions. The 36Cl‐36Ar cosmic ray exposure (CRE) ages range from 4.3 ± 0.4 Ma to 652 ± 99 Ma. By including literature data, we established a consistent and reliable CRE age database for 67 iron meteorites. The high quality of the CRE ages enables us to study structures in the CRE age histogram more reliably. At first sight, the CRE age histogram shows peaks at about 400 and 630 Ma. After correction for pairing, the updated CRE age histogram comprises 41 individual samples and shows no indications of temporal periodicity, especially not if one considers each iron meteorite group separately. Our study contradicts the hypothesis of periodic GCR intensity variations (Shaviv 2002, 2003), confirming other studies indicating that there are no periodic structures in the CRE age histogram (e.g., Rahmstorf et al. 2004; Jahnke 2005). The data contradict the hypothesis that periodic GCR intensity variations might have triggered periodic Earth climate changes. The 36Cl‐36Ar CRE ages are on average 40% lower than the 41K‐K CRE ages (e.g., Voshage 1967). This offset can either be due to an offset in the 41K‐K dating system or due to a significantly lower GCR intensity in the time interval 195–656 Ma compared to the recent past. A 40% lower GCR intensity, however, would have increased the Earth temperature by up to 2 °C, which seems unrealistic and leaves an ill‐defined 41K‐K CRE age system the most likely explanation. Finally, we present new 26Al/21Ne and 10Be/21Ne production rate ratios of 0.32 ± 0.01 and 0.44 ± 0.03, respectively.

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“…Pavetich et al . () modified their commercial ion source to reduce these effects, subsequently demonstrating the advantages of their new design by measuring samples of highly different stable chlorine ratios ( 35 Cl/ 37 Cl).…”

Section: Advances In Accelerator‐based Methods (Contribution By: R Bmentioning

confidence: 99%

“…, Pavetich et al . ) is the risks from cross‐contamination and long‐term memory in the ion source. Similar concerns apply to other volatile elements such as iodine.…”

Section: Advances In Accelerator‐based Methods (Contribution By: R Bmentioning

confidence: 99%

GGR Biennial Critical Review: Analytical Developments Since 2012

Wiedenbeck

Bèdard

Bugoi

et al. 2014

Geostandard Geoanalytic Res

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Advances in the chemical, crystallographic and isotopic characterisation of geological and environmental materials can often be ascribed to technological improvements in analytical hardware or to innovative approaches to data acquisition and/or its interpretation. This biennial review addresses key laboratory methods that form much of the foundation for analytical geochemistry; again, this contribution is presented as a compendium of laboratory techniques. We highlight advances that have appeared since January 2012 and that are of particular significance for the chemical and isotopic characterisation of geomaterials. Prominent scientists from the selected analytical fields present publications they judge to be particular noteworthy, providing background information about the method and assessing where further opportunities might be anticipated. In addition to the well-established technologies such as thermal ionisation mass spectrometry and plasma emission spectroscopy, this publication also presents new or rapidly growing methods such as electron backscattered diffraction analysis and atom probe tomographya very sensitive method providing atomic scale information.

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Interlaboratory study of the ion source memory effect in 36Cl accelerator mass spectrometry

Cited by 22 publications

References 28 publications

Accelerator Mass Spectrometry of 129I towards its lower limits

Accelerator Mass Spectrometry of 129I towards its lower limits

The constancy of galactic cosmic rays as recorded by cosmogenic nuclides in iron meteorites

GGR Biennial Critical Review: Analytical Developments Since 2012

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