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Title: A cold finger cooling system for the efficient graphitisation of microgram-sized carbon samples
Authors: Yang, B
Smith, AM
Hua, Q
Keywords: Accelerators
Cooling systems
Bosch process
Issue Date: 1-Jan-2013
Publisher: Elsevier Science BV
Citation: Yang, B., Smith, A. M., & Hua, Q. (2013). A cold finger cooling system for the efficient graphitisation of microgram-sized carbon samples. Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials & Atoms, 294, 262-265. doi:10.1016/j.nimb.2012.08.031
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.
Gov't Doc #: 4724
ISSN: 0168-583X
Appears in Collections:Journal Articles

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