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dc.contributor.authorPearson, Ann
dc.contributor.authorMcNichol, Ann P.
dc.contributor.authorSchneider, Robert J.
dc.contributor.authorVon Reden, K. F.
dc.contributor.authorZheng, Yan
dc.date.accessioned2021-02-11T20:44:42Z
dc.date.available2021-02-11T20:44:42Z
dc.date.issued1998-01-01
dc.identifier.citationPearson, A., McNichol, A. P., Schneider, R. J., Von Reden, K. F., & Zheng, Y. (1998). Microscale AMS 14C measurement at NOSAMS. Radiocarbon, 40(1), 61-75.
dc.identifier.issn0033-8222
dc.identifier.doi10.1017/S0033822200017902
dc.identifier.urihttp://hdl.handle.net/10150/653650
dc.descriptionFrom the 16th International Radiocarbon Conference held in Gronigen, Netherlands, June 16-20, 1997.
dc.description.abstractTechniques for making precise and accurate radiocarbon accelerator mass spectrometry (AMS) measurements on samples containing less than a few hundred micrograms of carbon are being developed at the NOSAMS facility. A detailed examination of all aspects of the sample preparation and data analysis process shows encouraging results. Small quantities of CO2 are reduced to graphite over cobalt catalyst at an optimal temperature of 605 degrees C. Measured 14C/12C ratios of the resulting targets are affected by machine-induced isotopic fractionation, which appears directly related to the decrease in ion current generated by the smaller sample sizes. It is possible to compensate effectively for this fractionation by measuring samples relative to small standards of identical size. Examination of the various potential sources of background 14C contamination indicates that the sample combustion process is the largest contributor, adding ca. 1 micrograms of carbon with a less-than-modern 14C concentration.
dc.language.isoen
dc.publisherDepartment of Geosciences, The University of Arizona
dc.relation.urlhttp://radiocarbon.webhost.uits.arizona.edu/
dc.rightsCopyright © by the Arizona Board of Regents on behalf of the University of Arizona. All rights reserved.
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectcombustion
dc.subjectisotope fractionation
dc.subjectmathematical methods
dc.subjectsize
dc.subjectC 14 C 12
dc.subjectaccuracy
dc.subjectgraphite
dc.subjectnative elements
dc.subjectdata processing
dc.subjectaccelerator mass spectroscopy
dc.subjectmass spectroscopy
dc.subjectspectroscopy
dc.subjectsample preparation
dc.subjectmethods
dc.subjectC 14
dc.subjectcarbon
dc.subjectisotopes
dc.subjectradioactive isotopes
dc.subjectcarbon dioxide
dc.subjectstable isotopes
dc.subjectabsolute age
dc.titleMicroscale AMS 14C Measurement at NOSAMS
dc.typeProceedings
dc.typetext
dc.identifier.journalRadiocarbon
dc.description.noteThis material was digitized as part of a cooperative project between Radiocarbon and the University of Arizona Libraries.
dc.description.collectioninformationThe Radiocarbon archives are made available by Radiocarbon and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.description.admin-noteMigrated from OJS platform February 2021
dc.source.volume40
dc.source.issue1
dc.source.beginpage61
dc.source.endpage75
refterms.dateFOA2021-02-11T20:44:42Z


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