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Radiocarbon, Volume 29 (1987): Recent submissions
Now showing items 1-20 of 44
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Radiocarbon, Volume 29, Number 2 (1987)American Journal of Science, 1987-01-01
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Radiocarbon, Volume 29, Number 3 (1987)American Journal of Science, 1987-01-01
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Radiocarbon, Volume 29, Number 1 (1985)American Journal of Science, 1987-01-01
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North American ArchaeologistAmerican Journal of Science, 1987-01-01
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New Books in ArchaeologyAmerican Journal of Science, 1987-01-01
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Available PublicationsAmerican Journal of Science, 1987-01-01
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Available PublicationsAmerican Journal of Science, 1987-01-01
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ArchaeometryAmerican Journal of Science, 1987-01-01
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The Impact of Bioturbation on a AMS 14C Dates on Handpicked Foraminifera: A Statistical ModelWhen single species of foraminifera picked from marine sediments are 14C dated with Accelerator Mass Spectrometry (AMS), bioturbation puts limits on the minimal sample size to be used, as uncertainty is added to the result by statistics of the picking process. The model presented here simulates the additional statistical uncertainty introduced into the measurement by the coupling of bioturbation and small sample amounts. As there is no general solution for this problem, we present two simple cases only. The model can also be used to simulate more complicated situations occurring in sediments.
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Scintillation Counter Performance at the SMU Radiocarbon LaboratoryResults 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.
