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University of Wisconsin Radiocarbon Dates XXIII∗

Published online by Cambridge University Press:  18 July 2016

Raymond L Steventon  and
John E Kutzbach
Raymond L Steventon
Affiliation:
Center for Climatic Research, Institute for Environmental Studies, University of Wisconsin-Madison, 1225 West Dayton Street Madison, Wisconsin 53706
John E Kutzbach
Affiliation:
Center for Climatic Research, Institute for Environmental Studies, University of Wisconsin-Madison, 1225 West Dayton Street Madison, Wisconsin 53706
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Procedures and equipment used in the University of Wisconsin laboratory have been described in previous date lists. The preamplifiers and counting system were replaced in 1977 using modified EC & G Ortec components. Except as otherwise indicated, wood, charcoal, and peat samples are pretreated with dilute NaOH-Na4P2O7 and dilute H3PO4 before conversion to the counting gas methane; when noted marls and lake cores are treated with acid only. Very calcareous materials are treated with HCl instead of H3PO4. Pretreatment of bone varies with the condition of the bone sample; solid bone with little deterioration is first cleaned manually and ultrasonically. The bone is treated with 8% HCl for 15 minutes, then dilute NaOH-Na4P2O7 for 3 hours at room temperature, washed until neutral, and the collagen extracted according to Longin (1971). Charred bone is treated with dilute HCl, NaOH-Na4P2O7, and then dilute HCl again.

Type
Research Article
Information
Radiocarbon , Volume 28 , Issue 3 , 1986 , pp. 1206 - 1223
Copyright
Copyright © The American Journal of Science 

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