Universität zu Köln

Fueloep, R. -H., Wacker, L. and Dunai, T. J. (2015). Progress report on a novel in situ C-14 extraction scheme at the University of Cologne. Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms, 361. S. 20 - 25. AMSTERDAM: ELSEVIER SCIENCE BV. ISSN 1872-9584

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Abstract

We present initial results of in situ C-14 system blank and calibration sample measurements obtained using the in situ C-14 extraction scheme developed at the University of Cologne. The C-14 extraction scheme specifically exploits the phase transformation of quartz to cristobalite in order to quantitatively extract the carbon as CO2 and follows a scheme that is different to that of existing extraction systems. Features are offline furnace extraction, single pass catalytic oxidation using mixed copper (I,II) oxide as catalyst, the use of UHV-compatible components and of vacuum annealed copper tubing. The design allows a relatively rapid sample throughput - two samples per day as opposed to the current 2 days per sample that can be done on other lines - and can accommodate samples ranging between 0.5 and 4 g of clean quartz. Following extraction and cleaning, the CO2 gas is measured using the gas ion source of the MICA-DAS AMS facility at ETH Zurich. The extraction system yields low systems blanks (10(+16)/(-10) x 10(3) atoms C-14, +/- 1 sigma) and the initial results indicate that further improvements are achievable. Measurements of the CRONUS-A standard sample show a good reproducibility and results are consistent with published values. We also present the first in situ C-14 results for the CRONUS-R standard material. (C) 2015 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Fueloep, R. -H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wacker, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dunai, T. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-389676
DOI:	10.1016/j.nimb.2015.02.023
Journal or Publication Title:	Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms
Volume:	361
Page Range:	S. 20 - 25
Date:	2015
Publisher:	ELSEVIER SCIENCE BV
Place of Publication:	AMSTERDAM
ISSN:	1872-9584
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GAS ION-SOURCE; COSMOGENIC C-14; QUARTZ; METEORITES; BEHAVIOR; GLASSES; CARBON Multiple languages Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/38967