Universität zu Köln

Melchert, Jan Olaf, Stolz, Alexander, Dewald, Alfred, Gierga, Merle, Wischhoefer, Philipp and Rethemeyer, Janet (2019). EXPLORING SAMPLE SIZE LIMITS OF AMS GAS ION SOURCE C-14 ANALYSIS AT COLOGNEAMS. Radiocarbon, 61 (6). S. 1785 - 1794. TUCSON: UNIV ARIZONA DEPT GEOSCIENCES. ISSN 1945-5755

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Abstract

Increasing demands for small-scale radiocarbon (C-14) analyses required the installation of a SO-110 B type ion source (HVE Europa B.V.) at our 6 MV Tandetron AMS (HVE) dedicated for the direct injection of CO2 using either the gas injection system (GIS) from Ionplus AG or a EuroVector EA 3000 elemental analyzer (EA). We tested both systems with multiple series of C-14-free and modern standards (2.5-50 mu g C) combusted in quartz ampoules or EA containers and were able to quantify exogenous C introduced. In EA-GIS-AMS analysis exogenous C is mainly derived from the EA sample containers. Blank values for 50 mu g C combusted in solvent-cleaned tin (Sn) vessels were 0.0127 +/- 0.0012 (FC)-C-14 (boats) and 0.0090 +/- 0.0010 (FC)-C-14 (capsules), while they were much higher for thermally cleaned silver (Ag) capsules. The processing of gas samples for GIS-AMS yields similar blank values corresponding to 0.30 +/- 0.08 mu g exogenous C with 0.93 +/- 0.23 (FC)-C-14 consisting of 0.28 mu g C modern and 0.02 mu g C fossil C. The combustion of larger amounts of blank material (1 mg C) in a single quartz tube split into aliquots gives lower blanks (0.0064 +/- 0.0008 (FC)-C-14; 50 mu g C). Thus, C-14 analysis of small, gaseous samples is now possible at CologneAMS.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Melchert, Jan Olaf UNSPECIFIED UNSPECIFIED UNSPECIFIED Stolz, Alexander UNSPECIFIED UNSPECIFIED UNSPECIFIED Dewald, Alfred UNSPECIFIED UNSPECIFIED UNSPECIFIED Gierga, Merle UNSPECIFIED UNSPECIFIED UNSPECIFIED Wischhoefer, Philipp UNSPECIFIED UNSPECIFIED UNSPECIFIED Rethemeyer, Janet UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-125651
DOI:	10.1017/RDC.2019.143
Journal or Publication Title:	Radiocarbon
Volume:	61
Number:	6
Page Range:	S. 1785 - 1794
Date:	2019
Publisher:	UNIV ARIZONA DEPT GEOSCIENCES
Place of Publication:	TUCSON
ISSN:	1945-5755
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute for Nuclear Physics
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RADIOCARBON MEASUREMENTS; ACIDS Multiple languages Geochemistry & Geophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/12565