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Poster De Conférence Année : 2022

Status report on small sample measurements with ECHoMICADAS AMS facility: 6 years of data processing and statistical results

Résumé

In 2015, a new AMS facility, the ECHoMICADAS was installed in the Laboratoire des Sciences du Climat et de l’Environnement (LSCE) at Gif-sur-Yvette, France. Equipped with a hybrid source, it allows the analysis of solid or gas samples for ¹⁴C measurement. This equipment is completed with several peripheral instruments. For solid measurement, 2 graphitisation systems are used: the homemade Graphitisation line (GéGé) to graphitize CO₂ and an Automated Graphitization Equipment (AGE3) for most of organic samples. For CO₂ gas measurement, the Gas Interface System (GIS) injects a mix of CO₂ and He into the source and allows to couple an elemental analyzer (EA) for organic sample, a tube cracking system for pure CO₂, and more recently a Carbonate Handling System (CHS2) for carbonates or dissolved inorganic carbon. This presentation focuses on measurement of small samples and how to process raw data. It is based on both CHS2-GIS and EA-GIS examples. We will describe how the data are processed, using a combination of the calculation made in Bats software [a] and of the models which were chosen to consider the constant and the cross contamination [b]. Since 2016, measurements on blanks and standards allow to yield enough statistics to estimate, even before its measurement what will be the age uncertainty, based on several expected parameters: the weight (or quantity of carbon), the current, the sample age, the measurement duration, and the chemical protocol which can induce different contaminations. [a] Lukas Wacker et al, NIMPR 2010 [b] Salazar et al, NIMPR 2015
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hal-04289360 , version 1 (16-11-2023)

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  • HAL Id : hal-04289360 , version 1

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François Thil, Nadine Tisnérat-Laborde, Christine Hatté, Claude Noury, Brian Phouybanhdyt. Status report on small sample measurements with ECHoMICADAS AMS facility: 6 years of data processing and statistical results. Radiocarbon 2022, Sep 2022, Zurich, Switzerland. ⟨hal-04289360⟩
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