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dc.contributor.authorShah Walter, Sunita R.  Concept link
dc.contributor.authorGagnon, Alan R.  Concept link
dc.contributor.authorRoberts, Mark L.  Concept link
dc.contributor.authorMcNichol, Ann P.  Concept link
dc.contributor.authorLardie Gaylord, Mary C.  Concept link
dc.contributor.authorKlein, Elizabeth  Concept link
dc.identifier.citationRadiocarbon 57, no. 1 (2015): 109–122en_US
dc.description© The Arizona Board of Regents on behalf of the University of Arizona, 2015. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Radiocarbon 57, no. 1 (2015): 109–122, doi:10.2458/azu_rc.57.18118.en_US
dc.description.abstractIn response to the increasing demand for 14C analysis of samples containing less than 25 µg C, ultra-small graphitization reactors with an internal volume of ~0.8 mL were developed at NOSAMS. For samples containing 6 to 25 µg C, these reactors convert CO2 to graphitic carbon in approximately 30 min. Although we continue to refine reaction conditions to improve yield, the reactors produce graphite targets that are successfully measured by AMS. Graphite targets produced with the ultra-small reactors are measured by using the Cs sputter source on the CFAMS instrument at NOSAMS where beam current was proportional to sample mass. We investigated the contribution of blank carbon from the ultra-small reactors and estimate it to be 0.3 ± 0.1 µg C with an Fm value of 0.43 ± 0.3. We also describe equations for blank correction and propagation of error associated with this correction. With a few exceptions for samples in the range of 6 to 7 µg C, we show that corrected Fm values agree with expected Fm values within uncertainty for samples containing 6–100 µg C.en_US
dc.description.sponsorshipThis work was funded by the NSF Cooperative Agreement for the Operation of a National Ocean Sciences Accelerator Mass Spectrometry Facility (OCE-0753487). S R Shah Walter was also partially supported by the WHOI Postdoctoral Scholar Program.en_US
dc.publisherUniversity of Arizona Librariesen_US
dc.rightsAttribution 3.0 Unported*
dc.subjectCarbon dioxideen_US
dc.subjectAccelerator mass spectroscopyen_US
dc.subjectSample preparationen_US
dc.titleUltra-small graphitization reactors for ultra-microscale 14C analysis at the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) Facilityen_US

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Attribution 3.0 Unported
Except where otherwise noted, this item's license is described as Attribution 3.0 Unported