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In-situ cosmogenic 14C analysis at ETH Zürich: Characterization and performance of a new extraction system


Lupker, Maarten; Hippe, Kristina; Wacker, Lukas; Steinemann, Olivia; Tikhomirov, Dmitry; Maden, Colin; Haghipour, Negar; Synal, Hans-Arno (2019). In-situ cosmogenic 14C analysis at ETH Zürich: Characterization and performance of a new extraction system. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 457:30-36.

Abstract

We present a new in-situ cosmogenic 14C extraction system developed at ETH Zürich. This system quantitatively extracts 14C produced in quartz by cosmic rays using a high temperature extraction procedure. A key improvement of the new extraction system is the implementation of largely automated sequences, CO2 transport in a He flow and the addition of a “dead” CO2 carrier gas, which ensure highly reproducible operation while limiting the required operator attendance. Intercomparison quartz samples were routinely measured over a year of operation and yield 14C concentrations of 7.27 (±0.03) · 105 at/g quartz for CRONUS-A (n = 7) and 1.24 (±0.17) · 104 at/g quartz for CRONUS-N (n = 4). The excellent performance of the new system is highlighted by low procedural blanks of ca. 3 · 104 14C atoms and coefficients of variation for the CRONUS-A and CRONUS-N analyses of only 0.4% and 14% respectively.

Abstract

We present a new in-situ cosmogenic 14C extraction system developed at ETH Zürich. This system quantitatively extracts 14C produced in quartz by cosmic rays using a high temperature extraction procedure. A key improvement of the new extraction system is the implementation of largely automated sequences, CO2 transport in a He flow and the addition of a “dead” CO2 carrier gas, which ensure highly reproducible operation while limiting the required operator attendance. Intercomparison quartz samples were routinely measured over a year of operation and yield 14C concentrations of 7.27 (±0.03) · 105 at/g quartz for CRONUS-A (n = 7) and 1.24 (±0.17) · 104 at/g quartz for CRONUS-N (n = 4). The excellent performance of the new system is highlighted by low procedural blanks of ca. 3 · 104 14C atoms and coefficients of variation for the CRONUS-A and CRONUS-N analyses of only 0.4% and 14% respectively.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Geography
Dewey Decimal Classification:910 Geography & travel
Uncontrolled Keywords:Nuclear and High Energy Physics, Instrumentation
Language:English
Date:15 October 2019
Deposited On:06 Jan 2020 13:22
Last Modified:06 Jan 2020 13:22
Publisher:Elsevier
ISSN:0168-583X
OA Status:Green
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1016/j.nimb.2019.07.028

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