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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/1742

Title: Developments in micro-sample 14C AMS at the ANTARES AMS facility.
Authors: Hua, Q
Williams, A
Levchenko, V
Ying, B
Smith, AM
Keywords: Carbon 14
Mass Spectroscopy
ANTARES Facility
Graphitization
Hydrogen
Sample Holders
Issue Date: 1-Apr-2010
Publisher: Elsevier
Citation: Hua, Q., Williams, A., Levchenko, V., & Ying, B. (2010). Developments in micro-sample 14C AMS at the ANTARES AMS facility. 11th International Conference on Accelerator Mass Spectrometry (AMS-11), 14th – 19th September 2008. Spazio Etoile, Rome. In Nuclear Instruments & Methods in Physics Research Section b-Beam Interactions with Materials and Atoms: Proceedings of the Eleventh International Conference on Accelerator Mass Spectrometry, 268(7-8), 919-923.
Abstract: We continue development of micro-sample radiocarbon sample preparation and AMS measurement at the ANTARES AMS facility. We routinely prepare samples containing 10–200 μg of carbon using an iron catalyst with an excess of hydrogen in 2.5 mL graphitisation reactors. These use a tube furnace to heat the catalyst to 600°C and a Peltier-cooled water trap. Samples containing just a few micrograms of carbon can be prepared. We describe progress with a 0.5 mL laser-heated ‘microfurnace’ we are developing for the rapid and efficient graphitisation of 5 μg samples. Following operating experience with a prototype unit, work has commenced on the development of a second-generation device with the goal of fully automated operation with minimal introduction of extraneous carbon. Key to development of micro-sample 14C AMS is the ability to reliably handle the graphite/iron sample and to mount it in the ion source target holder. We have developed a target holder that permits the sample to be loaded in a 1 mm diameter recess and rear pressed, ensuring a high quality surface finish, at a reproducible depth. Additionally we have developed a method for systematically aligning the sample stage with the cesium beam following ion source servicing.
URI: http://dx.doi.org/10.1016/j.nimb.2009.10.064
http://apo.ansto.gov.au/dspace/handle/10238/1742
ISSN: 0168-583X
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