A cold finger cooling system for the efficient graphitisation of microgram-sized carbon samples

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dc.contributor.authorYang, Ben_AU
dc.contributor.authorSmith, AMen_AU
dc.contributor.authorHua, Qen_AU
dc.date.accessioned2014-04-22T02:33:54Zen_AU
dc.date.available2014-04-22T02:33:54Zen_AU
dc.date.issued2013-01-01en_AU
dc.date.statistics2014-04-22en_AU
dc.descriptionProceedings of the Twelfth International Conference on Accelerator Mass Spectrometry, Wellington, New Zealand, 20-25 March 2011.en_AU
dc.description.abstractAt 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.en_AU
dc.identifier.citationYang, 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.2012.08.031en_AU
dc.identifier.conferenceenddate25 March 2011en_AU
dc.identifier.conferencenameTwelfth International Conference on Accelerator Mass Spectrometry, 2011en_AU
dc.identifier.conferenceplaceWellington, New Zealand.en_AU
dc.identifier.conferencestartdate20 March 2011en_AU
dc.identifier.editorsZondervan, A., Prior, C., Bruhn, F., & Sparks, R.en_AU
dc.identifier.govdoc4724en_AU
dc.identifier.issn0168-583Xen_AU
dc.identifier.journaltitleNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atomsen_AU
dc.identifier.pagination262-265en_AU
dc.identifier.urihttps://doi.org/10.1016/j.nimb.2012.08.031en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5460en_AU
dc.identifier.volume294en_AU
dc.language.isoenen_AU
dc.publisherElsevier Science BVen_AU
dc.subjectAcceleratorsen_AU
dc.subjectSpectroscopyen_AU
dc.subjectGraphitizationen_AU
dc.subjectCoolingen_AU
dc.subjectCooling systemsen_AU
dc.subjectBosch processen_AU
dc.subjectCarbonen_AU
dc.subjectANSTOen_AU
dc.subjectAluminiumen_AU
dc.subjectReactorsen_AU
dc.titleA cold finger cooling system for the efficient graphitisation of microgram-sized carbon samplesen_AU
dc.typeConference paperen_AU
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