A cold finger cooling system for the efficient graphitisation of microgram-sized carbon samples
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Date
2013-01-01
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier Science BV
Abstract
At ANSTO, we use the Bosch reaction to convert sample CO2 to graphite for production of our radiocarbon AMS targets. Key to the efficient graphitisation of ultra-small samples are the type of iron catalyst used and the effective trapping of water vapour during the reaction. Here we report a simple liquid nitrogen cooling system that enables us to rapidly adjust the temperature of the cold finger in our laser-heated microfurnace. This has led to an improvement in the graphitisation of microgram-sized carbon samples. This simple system uses modest amounts of liquid nitrogen (typically <200 mL/h during graphitisation) and is compact and reliable. We have used it to produce over 120 AMS targets containing between 5 and 20 mu g of carbon, with conversion efficiencies for 5 mu g targets ranging from 80% to 100%. In addition, this cooling system has been adapted for use with our conventional graphitisation reactors and has also improved their performance. © 2013, Elsevier Ltd.
Description
Proceedings of the Twelfth International Conference on Accelerator Mass Spectrometry, Wellington, New Zealand, 20-25 March 2011.
Keywords
Accelerators, Spectroscopy, Graphitization, Cooling, Cooling systems, Bosch process, Carbon, ANSTO, Aluminium, Reactors
Citation
Yang, B., Smith, A. M., & Hua, Q. (2013). A cold finger cooling system for the efficient graphitisation of microgram-sized carbon samples. Paper presented at the Twelfth International Conference on Accelerator Mass Spectrometry, 20-25 March 2011, Wellington, New Zealand. In Zondervan, A., Prior, C., Bruhn, F., & Sparks, R. (Eds), Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 294, 262-265. doi:10.1016/j.nimb.2012.08.031