• Time Series Analysis of Low Level Gas Counting Data

      Kaihola, Lauri; Polach, Henry A.; Kojola, Hannu (American Journal of Science, 1984-01-01)
      We demonstrate the feasibility of pulse time of arrival information for early detection of periodic events in low level counting. Time of arrival data allows us to apply time series analysis and serial correlation tests which, in graphic form, give the user an illustrative view of the parameters affecting the validity of counting statistics. The decision to discontinue counting can already be made on the basis of less than 100 counts from the time information alone if more than 10 of these are non-Poisson periodic counts. The analyses also serve as a means of quality control for low level counting, being directly based upon the interval distribution of the Poisson process.
    • University of Pennsylvania Radiocarbon Dates XXII

      Hurst, Barbara J.; Lawn, Barbara (American Journal of Science, 1984-01-01)
    • University of Saskatchewan Radiocarbon Dates X

      Rutherford, A. A.; Wittenberg, Jurgen; Gordon, B. C. (American Journal of Science, 1984-01-01)
    • La Jolla Natural Radiocarbon Measurements X

      Linick, T. W. (American Journal of Science, 1984-01-01)
    • Rudjer Bošković Institute Radiocarbon Measurements VIII

      Srdoč, Dušan; Obelić, Bogomil; Horvatinčić, Nada; Krajcar, Ines; Sliepčević, Adela (American Journal of Science, 1984-01-01)
    • Radiocarbon Style Guide

      American Journal of Science, 1984-01-01
    • Bomb 14C in the Ocean Surface, 1966-1981

      Nydal, Reidar; Gulliksen, Steinar; Lövseth, Knut; Skogseth, Fred H. (American Journal of Science, 1984-01-01)
      Bomb 14C has been used as a tracer for COin ocean surface water to study CO2 exchange between atmosphere and ocean. Using ordinary cargo ships for sampling, we have been able to cover some parts of the Atlantic, Pacific, and Indian Oceans for certain periods. A total number of 520 samples from 89 locations were measured during the last 15 years. The data are presented both in tables and graphs. A maximum 14C concentration (Delta-14C) of ca 20% was observed in temperate northern latitudes, and a few per cent lower at southern latitudes. A seasonal trend in the 14C variation, with summer maximum and winter minimum, was observed both in downwelling and upwelling areas.
    • Selective Leaching of Shells for 14C Dating

      Vita-Finzi, Claudio; Roberts, Neil (American Journal of Science, 1984-01-01)
      Although acid leaching of shell carbonates prior to 14C assay is usually desirable, under some circumstances it can worsen contamination by preferentially solving unaltered shell and thus increasing the proportion of secondary carbonate. The risk can be eliminated by monitoring the progress of leaching with the help of microscopy and x-ray diffraction.
    • British Museum Natural Radiocarbon Measurements XVII

      Burleigh, Richard; Ambers, Janet; Matthews, Keith (American Journal of Science, 1984-01-01)
    • Laboratories

      American Journal of Science, 1984-01-01
    • University of Wisconsin Radiocarbon Dates XXI

      Steventon, Raymond L.; Kutzbach, John E. (American Journal of Science, 1984-01-01)
    • University of Lund Radiocarbon Dates XVII

      Håkansson, Sören (American Journal of Science, 1984-01-01)
    • Lodz Radiocarbon Dates I

      Kanwiszer, Andrzej; Trzeciak, Pawel (American Journal of Science, 1984-01-01)
    • Notice to Readers and Contributors

      American Journal of Science, 1984-01-01
    • Vienna Radium Institute Radiocarbon Dates XIV

      Felber, Heinz (American Journal of Science, 1984-01-01)
    • Zero BP Plus 34: 25 Years of Radiocarbon

      Deevey, Edward S. (American Journal of Science, 1984-01-01)