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    Browsing Radiocarbon, Volume 29, Number 1 (1987) by Title

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        Antwerp University Radiocarbon Dates IV

        Vanhoorne, R.; Dubois, A. D. (American Journal of Science, 1987-01-01)
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        Available Publications

        American Journal of Science, 1987-01-01
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        British Museum Natural Radiocarbon Measurements XIX

        Ambers, Janet; Burleigh, Richard; Matthews, Keith (American Journal of Science, 1987-01-01)
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        Comments on Multiple Dating of a Long Flowstone Profile

        Grün, Rainer; Schwarcz, Henry P.; Geyh, Mebus A.; Hennig, G. J. (American Journal of Science, 1987-01-01)
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        Comparative Study of the Radiocarbon Dating of Different Bone Collagen Preparations

        Gurfinkel, D. M. (American Journal of Science, 1987-01-01)
        Four different bone collagen preparation procedures were compared and were found useful as a means of assessing the nature of contaminants present in a sample. Weathered bone however appeared to contain contaminants that could not be eliminated by any of the procedures studied.
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        Comparison of Oceanic 14C Data with Those of GEOSECS: Vertical Profiles in 1973 (GEOSECS) and in 1980 at (30 Degrees N, 170 Degrees E) in the Northwestern Pacific Ocean

        Gamo, Toshitaka; Horibe, Yoshio; Kobayashi, Hiromi (American Journal of Science, 1987-01-01)
        The vertical profile of radiocarbon at (30 degrees N, 170 degrees E) measured in 1980 was compared with the GEOSECS data measured in 1973. 14C was extracted from 200L of sea water, converted to C2H2, and analyzed with a gas proportional counter. Our profile and that of GEOSECS were in good agreement below 700m depth without systematic deviation of Delta-14C values between both measurements. On the other hand, a Delta-14C increase was observed above 700m depth, reflecting the transient addition, in 6.6 years, of bomb 14C to the intermediate layer from the atmosphere.
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        Drastic Increase of Background in the Gliwice Radiocarbon Laboratory During Late April, 1986, and Its Time Changes

        Pazdur, Mieczysław F.; Zastawny, Andrzej (American Journal of Science, 1987-01-01)
        Preliminary observations of changes of the background of three proportional counters during May and June,1986, are presented. Some isotopes contributing to the rise of background were identified on the basis of their half-life determinations.
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        Evaluation and Status of Liquid Scintillation Counting for Radiocarbon Dating

        Polach, Henry A. (American Journal of Science, 1987-01-01)
        An international review of liquid scintillation low-level counting procedures and instrumentation made it possible to assess in detail those elements which lead to high-precision liquid scintillation radiocarbon dating with a Figure of Merit of 32,000. Current research is documented and future possibilities are alluded to.
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        Harwell Radiocarbon Measurements V

        Walker, A. J.; Keyzor, R. S.; Otlet, R. L. (American Journal of Science, 1987-01-01)
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        New Books in Archaeology

        American Journal of Science, 1987-01-01
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        Radiocarbon Content of Tropospheric CO2 at China Lake, California 1977-1983

        Berger, Rainer; Jackson, T. B.; Michael, Robert; Suess, H. E. (American Journal of Science, 1987-01-01)
        The measurements reported here are a continuation of tropospheric radiocarbon measurements in carbon dioxide carried out since 1961 at our China Lake, California collection facility. The data show a continued decrease in radiocarbon activity from ca 330 per mil in 1977 to 215 per mil in 1983 in agreement with similar analyses in Europe for the same time interval.
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        Radiocarbon, Volume 29, Number 1 (1985)

        American Journal of Science, 1987-01-01
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        Rehovot Radiocarbon Measurements III

        Carmi, Israel (American Journal of Science, 1987-01-01)
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        Rudjer Bošković Institute Radiocarbon Measurements IX

        Srdoč, Dušan; Horvatinčić, Nada; Obelić, Bogomil; Krajcar Bronić, Ines; Sliepčević, Adela (American Journal of Science, 1987-01-01)
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        Rudjer Bošković Institute Radiocarbon Measurements X

        Srdoč, Dušan; Obelić, Bogomil; Sliepčević, Adela; Krajcar Bronić, Ines; Horvatinčić, Nada (American Journal of Science, 1987-01-01)
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        Scintillation Counter Performance at the SMU Radiocarbon Laboratory

        Devine, James M.; Haas, Herbert (American Journal of Science, 1987-01-01)
        Results are presented of a study of counter performance and vial characteristics for three liquid scintillation counters used at the SMU Radiocarbon Laboratory: the Intertechnique LS20, Packard Tri-Garb 460C, and LKB Wallac Rack Beta 1217. Modifications to photomultiplier tube high voltage, pre-amplifier gain, energy window settings, counting vial design, and sample holder design have resulted in reduced background, higher counting efficiency, and greater long-term stability for the Intertechnique and Packard counters. Square quartz counting vials are used in the Intertechnique and Packard counters with excellent results. Use of Teflon vials in the LKB counter requires careful cleaning procedures and long counting times.
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        Study of Bone Radiocarbon Dating Accuracy at the University of Arizona NSF Accelerator Facility for Radioisotope Analysis

        Stafford, Thomas; Jull, A. J. T.; Brendel, Klaus; Duhamel, Raymond C.; Donahue, Douglas (American Journal of Science, 1987-01-01)
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