Heidelberg Radiocarbon Lab

• Verfasst von: Therre, Steffen [VerfasserIn]
• Verfasst von: Proß, Lukas [VerfasserIn]
• Verfasst von: Friedrich, Ronny [VerfasserIn]
• Verfasst von: Trüssel, Martin [VerfasserIn]
• Verfasst von: Frank, Norbert [VerfasserIn]
• Titel: Heidelberg Radiocarbon Lab
• Titelzusatz: establishing a new carbon dioxide extraction line for carbonate samples
• Verf.angabe: S. Therre, L. Proß, R. Friedrich, M. Trüssel, N. Frank
• E-Jahr: 2021
• Jahr: 30 April 2021
• Umfang: 10 S.
• Fussnoten: Gesehen am 27.06.2022
• Titel Quelle: Enthalten in: Radiocarbon
• Ort Quelle: Cambridge : Cambridge University Press, 1959
• Jahr Quelle: 2021
• Band/Heft Quelle: 63(2021), 3, Seite 915-924
• ISSN Quelle: 1945-5755
• DOI: doi:10.1017/RDC.2021.28
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: CO2 extraction setup
• Sach-SW: paleoclimate research
• Sach-SW: radiocarbon sample preparation
• Sach-SW: secondary carbonates
• Sach-SW: stalagmites
• K10plus-PPN: 1807897621
• K10plus-PPN:
  Universitätsbibliothek
• Lokale URL UB: Zum Volltext

Abstract

To achieve high-precision and reproducible results from radiocarbon (14C) dating of carbonate samples in paleoclimate research, a new CO2 extraction line was designed, constructed, and characterized at the Heidelberg Radiocarbon Lab of the Institute of Environmental Physics, Heidelberg. The setup includes a circular glass-tube design, which is operated at vacuum pressure levels of the order of 10-5 mbar. The efficiency of the extraction process was assessed, showing significantly favorable conditions for solid piece samples (99.58 ± 4.69)% over powdered samples (88.28 ± 10.03)%. Process blank values are below 0.2 pMC apparent 14C activity. Repeated measurements of IAEA C2 standards with an average value of (41.09 ± 0.23) pMC attest high accuracy and reproducibility of the instrument. Six consecutive samples of 6 to 12 mg carbonate mass can be processed in one run of roughly 2.5 hours. Thus, the new setup contributes to time-efficient and reproducible radiocarbon dating results for paleoclimate research at the Institute of Environmental Physics. In a first application, Dead Carbon Fraction (DCF) values of a Holocene alpine stalagmite from Schratten Cave are presented, revealing extraordinarily high offsets between atmospheric and stalagmite 14C with DCF values between (49.4 ± 0.4)% and (61.6 ± 0.4)%.