Prof Christopher Ramsey: Publications

Radiocarbon dates from the 91̽�� AMS System: Archaeometry datelist 23

Archaeometry 39:1 (1997) 247-262

Authors:

REM Hedges, PB Pettitt, CB Ramsey, GJ Van Klinken

Radiocarbon dates from the 91̽�� AMS system: Archaeometry datelist 24

Archaeometry 39:2 (1997) 445-471

Authors:

REM Hedges, PB Pettitt, C Bronk Ramsey, GJ Van Klinken

An Independent Chronology for British Bronze Age Metalwork: The Results of the 91̽�� Radiocarbon Accelerator Programme

Archaeological Journal Taylor & Francis 154:1 (1997) 55-107

Authors:

Stuart Needham, Christopher Bronk Ramsey, David Coombs, Caroline Cartwright, Paul Pettitt

An Experiment to Refute the Likelihood of Cellulose Carboxylation

Radiocarbon Cambridge University Press (CUP) 40:1 (1997) 59-60

Authors:

REM Hedges, Christopher Bronk Ramsey, G-J Van Klinken

Abstract:

To test the hypothesis that cellulose in linen can be carboxylated at high temperatures in the presence of CO2, water and silver, we heated two aliquots of cellulose extracted from old wood in glass ampoules, adding Ag powder to one to test its potential action as a catalyst for the carboxylation reaction. AMS measurement of the heated aliquots showed no statistically significant difference in 14C content from the “uncarboxylated” cellulose. We conclude that carboxylation is not a systematic source of error in the dating of cellulose-containing materials such as the linen in the Shroud of Turin.

An Ion Source for the HVEE ¹⁴C Isotope Ratio Mass Spectrometer for Biomedical Applications

Radiocarbon Cambridge University Press (CUP) 40:1 (1997) 283-288

Authors:

Dirk JW Mous, Wim Fokker, Rein Van Den Broek, Ron Koopmans, Christopher Bronk Ramsey, REM Hedges

Abstract:

During the past two decades, accelerator mass spectrometry (AMS) has allowed major developments in many areas of geosciences and archaeology. In the near future, AMS should realize a similar potential in the field of biomedical research, leading ultimately to clinical applications. For such applications, the required instrument differs significantly from that presently used in the field of 14C dating. Whereas the needed accuracy and sensitivity is more than an order of magnitude less demanding than that for present state-of-the-art 14C instrumentation, the widespread acceptance of 14C AMS in biomedical research will require AMS spectrometers that are small, simple to operate and capable of handling CO2 samples. In order to satisfy these demands, HVEE has developed a compact 14C AMS spectrometer dedicated to biomedical research. The instrument consists of a compact accelerator with a footprint of 2.25 × 1.25 m and an ion source that features direct CO2 acceptance and optimal user friendliness. Having previously described the layout and design of the accelerator, we here discuss progress on the accelerator and present the design and first results of the CO2 ion source.

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