Improvements in the measurement of small 14CO2 samples at CologneAMS

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Title:Main Title: Improvements in the measurement of small 14CO2 samples at CologneAMS
Description:Abstract: Since 2015, the CologneAMS started operating a second SO-110 B ion source (Arnold et al., 2010; Klein and Mous, 2017) from High Voltage Engineering Europe (HVE) with a gas injection system (GIS) from Ionplus AG (Wacker et al., 2013) for the measurement of gaseous CO2 samples. Signi cant e ort was spent increasing the e ciency of C ion beam extraction as well as the operational reliability. Details are described in Stolz et al. (2017). Recent work was aimed at prolonging the cleaning intervals and allowing unattended routine 14C CO2 measurements. Problems related to sparking inside the source chamber could be eliminated by electrically shielding the ceramic linear actuator that is used to move the target pieces into the source head. Furthermore, the Cs reservoir temperature was decreased from 135 °C to 120 °C. The negative ion formation e ciency has dropped only slightly to about 5% with the current settings. Additionally, the GIS sample magazine capacity was doubled to 16 ampules, which enables longer measurements without user interaction. A dedicated software (Gas Injection Control Software, GICS) was developed that controls GIS and AMS hardware for fully autonomous measurements, including the source and accelerator startup, sample cracking or combustion, sample mixing with the He carrier gas and the transfer to the source, as well as the subsequent data analysis. This tool also comprises error detection routines in order to minimize the risk of losing a sample due to hardware failures. The blank value was reduced from typically 7·10 15 to 3·10 15. This was achieved by modi cations in the cleaning and measurement procedures. Recently a EuroVector EA3000 elemental analyzer (EA) was coupled to the GIS and integrated into the GICS software. First EA test measurements with standards, blanks and tree rings were performed as well as rst automated overnight measurements with ampules and EA samples.
Identifier:10.1016/j.nimb.2018.12.008 (DOI)
Responsible Party
Creators:Alexander Stolz (Author), Alfred Dewald (Author), Stefan Heinze (Author), Richard Altenkirch (Author), Gereon Hackenberg (Author), Susan Herb (Author), Claus Müller-Gatermann (Author), Markus Schiffer (Author), Gregor Zitzer (Author), Anja Wotte (Author), Janet Rethemeyer (Author), Tibor Dunai (Author)
Publisher:Elsevier
Publication Year:2019
Topic
CRC1211 Topic:Dating
Related Subproject:D4
Subject:Keyword: Accelerator Mass Spectroscopy
File Details
Filename:Stolz2019.pdf
Data Type:Data Paper - Article
File Size:3.1 MB
Date:Available: 16.12.2018
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
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Download Permission:Only Project Members
General Access and Use Conditions:According to the CRC1211DB data policy agreement.
Access Limitations:According to the CRC1211DB data policy agreement.
Licence:None
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Specific Information - Publication
Publication Status:Published
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:Nuclear Inst. and Methods in Physics Research B
Volume:439
Number of Pages:6 (70 - 75)
Metadata Details
Metadata Creator:Andrea Jaeschke
Metadata Created:10.10.2019
Metadata Last Updated:10.10.2019
Subproject:D4
Funding Phase:1
Metadata Language:English
Metadata Version:V50
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