Microscale AMS 14C Measurement at NOSAMS
dc.contributor.author | Pearson, Ann | |
dc.contributor.author | McNichol, Ann P. | |
dc.contributor.author | Schneider, Robert J. | |
dc.contributor.author | Von Reden, K. F. | |
dc.contributor.author | Zheng, Yan | |
dc.date.accessioned | 2021-02-11T20:44:42Z | |
dc.date.available | 2021-02-11T20:44:42Z | |
dc.date.issued | 1998-01-01 | |
dc.identifier.citation | Pearson, 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.issn | 0033-8222 | |
dc.identifier.doi | 10.1017/S0033822200017902 | |
dc.identifier.uri | http://hdl.handle.net/10150/653650 | |
dc.description | From the 16th International Radiocarbon Conference held in Gronigen, Netherlands, June 16-20, 1997. | |
dc.description.abstract | Techniques 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.iso | en | |
dc.publisher | Department of Geosciences, The University of Arizona | |
dc.relation.url | http://radiocarbon.webhost.uits.arizona.edu/ | |
dc.rights | Copyright © by the Arizona Board of Regents on behalf of the University of Arizona. All rights reserved. | |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | |
dc.subject | combustion | |
dc.subject | isotope fractionation | |
dc.subject | mathematical methods | |
dc.subject | size | |
dc.subject | C 14 C 12 | |
dc.subject | accuracy | |
dc.subject | graphite | |
dc.subject | native elements | |
dc.subject | data processing | |
dc.subject | accelerator mass spectroscopy | |
dc.subject | mass spectroscopy | |
dc.subject | spectroscopy | |
dc.subject | sample preparation | |
dc.subject | methods | |
dc.subject | C 14 | |
dc.subject | carbon | |
dc.subject | isotopes | |
dc.subject | radioactive isotopes | |
dc.subject | carbon dioxide | |
dc.subject | stable isotopes | |
dc.subject | absolute age | |
dc.title | Microscale AMS 14C Measurement at NOSAMS | |
dc.type | Proceedings | |
dc.type | text | |
dc.identifier.journal | Radiocarbon | |
dc.description.note | This material was digitized as part of a cooperative project between Radiocarbon and the University of Arizona Libraries. | |
dc.description.collectioninformation | The Radiocarbon archives are made available by Radiocarbon and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information. | |
dc.eprint.version | Final published version | |
dc.description.admin-note | Migrated from OJS platform February 2021 | |
dc.source.volume | 40 | |
dc.source.issue | 1 | |
dc.source.beginpage | 61 | |
dc.source.endpage | 75 | |
refterms.dateFOA | 2021-02-11T20:44:42Z |