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Novel Laser Ablation Sampling Device for the Rapid Radiocarbon Analysis of Carbonate Samples by Accelerator Mass Spectrometry

Published online by Cambridge University Press:  17 February 2016

C Welte ,
L Wacker ,
B Hattendorf ,
M Christl ,
J Koch ,
H-A Synal  and
D Günther
C Welte
Affiliation:
Laboratory of Inorganic Chemistry, D-CHAB, ETHZ, Vladimir-Prelog Weg 1, 8093 Zurich, Switzerland. Laboratory of Ion Beam Physics, ETHZ, Otto-Stern Weg 5, HPK, 8093 Zurich, Switzerland.
L Wacker*
Affiliation:
Laboratory of Ion Beam Physics, ETHZ, Otto-Stern Weg 5, HPK, 8093 Zurich, Switzerland.
B Hattendorf*
Affiliation:
Laboratory of Inorganic Chemistry, D-CHAB, ETHZ, Vladimir-Prelog Weg 1, 8093 Zurich, Switzerland.
M Christl
Affiliation:
Laboratory of Ion Beam Physics, ETHZ, Otto-Stern Weg 5, HPK, 8093 Zurich, Switzerland.
J Koch
Affiliation:
Laboratory of Inorganic Chemistry, D-CHAB, ETHZ, Vladimir-Prelog Weg 1, 8093 Zurich, Switzerland.
H-A Synal
Affiliation:
Laboratory of Ion Beam Physics, ETHZ, Otto-Stern Weg 5, HPK, 8093 Zurich, Switzerland.
D Günther
Affiliation:
Laboratory of Inorganic Chemistry, D-CHAB, ETHZ, Vladimir-Prelog Weg 1, 8093 Zurich, Switzerland.
*
*Corresponding author. Email: [email protected].
*Corresponding author. Email: [email protected].
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Abstract

Conventional radiocarbon analysis of carbonate records with accelerator mass spectrometry (AMS) is time consuming and the achievable spatial resolution is limited, because individual samples have to be taken and need to be converted to graphite for the measurement. A new laser ablation (LA) in situ sampling technique for rapid online 14C analyses of carbonate records by AMS is presented. By focusing a 193-nm ArF excimer laser on carbonate samples, carbon dioxide is generated and can directly be introduced into the gas ion source of an AMS. A dedicated LA cell for AMS was constructed in a way that combines rapid gas exchange with the capacity to carry sample specimen with maximum dimensions of 15×2.5×1.5 cm3. With the presented setup, negative carbon ion currents up to 20 µA were achieved. A low 14C background of 0.011±0.002 F14C was observed on 14C-free marble and different standard and reference materials could be well reproduced within errors. The novel technique allows scanning carbonate samples continuously over several cm per hour with achievable measurement precisions of less than 1% for modern samples. This approach allows acquiring highly spatially resolved 14C records at a far higher rate than with any currently available method.

Keywords

radiocarbonlaser ablationcarbonategas ion source
Type
Research Article
Information
Radiocarbon , Volume 58 , Issue 2 , June 2016 , pp. 419 - 435
Copyright
© 2016 by the Arizona Board of Regents on behalf of the University of Arizona 

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