Current Performance and Preliminary Results of a New 14C Extraction Line for Meteorites at the University of Bern

Mészáros, Marianna; Leya, Ingo; Hofmann, Beda; Szidat, Sönke (2018). Current Performance and Preliminary Results of a New 14C Extraction Line for Meteorites at the University of Bern. Radiocarbon, 60(02), pp. 601-615. Arizona Board of Regents, University of Arizona 10.1017/rdc.2017.114

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Here, we introduce a new radiocarbon (14C) extraction line operating at the University of Bern, which was designed and built for the extraction of in situ 14C from meteorites. With this system, we achieved two important developments compared to other systems. First, using the MICADAS gas-interface system, 14C can directly be measured from the collected CO2 gas, i.e., without graphitization of the sample. Second, meteorite sample masses as low as ~0.05 g can be used for high precision and reproducibility. Prior to extraction in an oxygen atmosphere held at a pressure of ~20–30 mbar in an iridium crucible at 1600°C for 40 min, samples were preheated for 1 h in a constant oxygen flow at 500°C and continuous pumping. Gas purification followed the method described previously (e.g., Hippe et al. 2009). While the blank levels for preheated samples are low (<2×104 14C atoms), the blanks for non-preheated samples are high, therefore those results cannot be used. We also report preliminary results for the L-chondrite JaH 073. The terrestrial age of 17.7±0.4 ka is in good agreement with previous results for the same sample of this meteorite, confirming that the extraction line, the gas purification system, and the AMS measurements are all reliable.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Departement of Chemistry and Biochemistry
08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Physics Institute
08 Faculty of Science > Physics Institute > NCCR PlanetS

UniBE Contributor:

Mészáros, Marianna; Leya, Ingo; Hofmann, Beda and Szidat, Sönke

Subjects:

500 Science > 520 Astronomy
500 Science > 540 Chemistry
500 Science > 550 Earth sciences & geology
600 Technology > 620 Engineering

ISSN:

0033-8222

Publisher:

Arizona Board of Regents, University of Arizona

Language:

English

Submitter:

Dora Ursula Zimmerer

Date Deposited:

12 Dec 2017 08:31

Last Modified:

22 Mar 2019 13:36

Publisher DOI:

10.1017/rdc.2017.114

BORIS DOI:

10.7892/boris.107726

URI:

https://boris.unibe.ch/id/eprint/107726

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