Change search
ReferencesLink to record
Permanent link

Direct link
Carrier free Be-10/Be-9 measurements with low-energy AMS: Determination of sedimentation rates in the Arctic Ocean
Show others and affiliations
2013 (English)In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, Vol. 294, 67-71 p.Article in journal (Refereed) Published
Abstract [en]

Using the TANDY AMS facility (600 kV) at ETH Zurich the seawater-derived (authigenic) Be-10/Be-9 ratio of marine sediment samples is measured without the addition of Be-9 carrier. This novel method reduces systematic uncertainties because the Be-10/Be-9 ratio of a sample is determined in only one (AMS) measurement. A challenge of carrier-free AMS is to avoid any contamination of the sample with Be-9 during the chemical preparation. Further, the leaching procedure has to be reproducible and ideally should attack the authigenic Be of the sediments only, leaving the detrital Be untouched. The low amount of stable Be-9 in the unspiked samples causes low currents during the AMS measurement. This requires a good stability and sensitivity of the AMS setup. Our first results show that the new preparation method is reliable and that background from stable Be-9 is avoided.

For a comparison study, sediment samples from two cores located in the Arctic Ocean (HLY0503-09JPC, HLY0503-14JPC) were used. The authigenic Be-10/Be-9 ratio of these samples had been determined previously applying the conventional method where Be-10 and Be-9 concentrations are measured separately by AMS and ICP-MS, respectively. The resulting sedimentation rates are in discrepancy with values derived from biomarkers. To cross check the Be-10/Be-9 based age model two samples from each core were measured again with the new carrier-free method. The carrier-free results show systematically higher authigenic Be-10/Be-9 ratios. The calculated sedimentation rates of about 0.2 cm/kyr, however, are consistent for the carrier free and the conventional method.

Place, publisher, year, edition, pages
2013. Vol. 294, 67-71 p.
Keyword [en]
Carrier-free Be-10 AMS, Seawater-derived Be, Arctic Ocean sedimentation rate
National Category
Physical Sciences
Research subject
URN: urn:nbn:se:su:diva-84691DOI: 10.1016/j.nimb.2012.07.016ISI: 000313234300013OAI: diva2:581213
12th International Conference on Accelerator Mass Spectrometry (AMS), GNS Sci, Wellington, NEW ZEALAND, MAR 20-25, 2011
Available from: 2012-12-29 Created: 2012-12-29 Last updated: 2013-02-12Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Jakobsson, Martin
By organisation
Department of Geological Sciences
In the same journal
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 36 hits
ReferencesLink to record
Permanent link

Direct link