TY - CONF T1 - (super 14) C AMS measurements of Y1 - 1998 A1 - von Reden, Karl F. A1 - McNichol, Ann P. A1 - Pearson, Ann A1 - Schneider, Robert J. KW - 03 KW - absolute age KW - accelerator mass spectroscopy KW - C-14 KW - carbon KW - dilution KW - Geochronology KW - ions KW - isotopes KW - mass spectroscopy KW - precision KW - radioactive isotopes KW - sample preparation KW - spectroscopy KW - volume AB - The NOSAMS facility at Woods Hole Oceanographic Institution has started to develop and apply techniques for measuring very small samples on a standard Tandetron accelerator mass spectrometry (AMS) system with high-current hemispherical Cs sputter ion sources. Over the past year, results on samples ranging from 7 to 160 mu g C showed both the feasibility of such analyses and the present limitations on reducing the size of solid carbon samples. One of the main factors affecting the AMS results is the dependence of a number of the beam optics parameters on the extracted ion beam current. The extracted currents range from 0.5 to 10 mu A of (super 12) C (super -) for the sample sizes given above. We here discuss the setup of the AMS system and methods for reliable small-sample measurements and give the AMS-related limits to sample size and the measurement uncertainties. PB - University of Arizona, Department of Geosciences, Tucson, AZ, United States (USA) CY - United States (USA) VL - 40 N1 - id: 2239; Source type: conferencepapers&proceedings; Object type: Article; Object type: Conference Paper; Copyright: GeoRef, Copyright 2007, American Geological Institute.; CSAUnique: 1999-044459; AccNum: 1999-044459; ISSN: 0033-8222; CODEN: RACAAT ER -