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Rhodesian Radiocarbon Measurements IV

Published online by Cambridge University Press:  18 July 2016

J. G. Sheppard
Affiliation:
Department of Chemistry, University of Rhodesia, Salisbury, Rhodesia
E. R. Swart
Affiliation:
Department of Chemistry, University of Rhodesia, Salisbury, Rhodesia
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The following list of dates was compiled since 1967 (R., 1967, v. 9, p. 382-386). Procedures of measurements are essentially unchanged from those reported previously (R., 1964, v. 6, p. 31-36; 1966, v. 8, p. 423-429). The only major change in procedure is that the practice adopted in previous date lists of widening the errors due to fluctuations in C14 content of the exchange reservoir has been discontinued. This leaves the users free to apply the necessary corrections as they become available, e.g., Stuiver and Suess (1966) and Ralph and Michael (1969). The two gas proportional counters were rebuilt in 1968. It was found that outgassing the polytetrafluoroethylene insulators at 100°C under vacuum for 48 hours prior to reassembling the counters considerably hastened attainment of stable operating conditions.

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Research Article
Copyright
Copyright © The American Journal of Science 

References

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