• Current 14C Measurements with the University of Washington Accelerator Facility for Radioisotope Dating

      Farwell, G. W.; Grootes, P. M.; Leach, D. D.; Schmidt, F. H.; Stuiver, Minze (American Journal of Science, 1983-01-01)
      Our accelerator mass spectrometry (AMS) system shows a one-to-one relationship between sample 14C concentrations determined by AMS and by Beta-counting. Measurements of unknown samples against a standard indicate that 14C concentration measurements to better than 2% can be made. For a 30-second data collection interval in a typical run of 100 intervals, the variability of the beam injected into the accelerator is ca 2%, that of the machine transmission is ca 4%, and counting statistics give 4.7% standard deviation for a sample of 80% of modern carbon.
    • Foreword

      Stuiver, Minze (American Journal of Science, 1983-01-01)
    • International Agreements and the Use of the New Oxalic Acid Standard

      Stuiver, Minze (American Journal of Science, 1983-01-01)
    • Mid-Wisconsinan Radiocarbon Dates from Mastodon- and Mammoth-Bearing Springs, Ozark Highland, Missouri

      Haynes, C. V.; Stuiver, Minze; Haas, Herbert; King, J. E.; King, F. B.; Saunders, J. J. (American Journal of Science, 1983-01-01)
    • Statistics of the AD Record of Climatic and Carbon Isotopic Change

      Stuiver, Minze (American Journal of Science, 1983-01-01)
      The AD time series of Delta-14C, delta-13C, and cosmic ray fluxes, Q, were analyzed for similarities. Two cases of significant correlation between Q and tree-ring delta-13C were encountered, for which up to 25% of the variance can be attributed to changes in the tree's isotope fractionation that related to solar induced climatic changes. However, it is possible that the demonstrated correlation is fortuitous because actual climate proxy records generally do not correlate significantly with the Q record.