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Birmingham University Radiocarbon Dates II

Published online by Cambridge University Press:  18 July 2016

F. W. Shotton ,
D. J. Blundell  and
R. E. G. Williams
F. W. Shotton
Affiliation:
The University of Birmingham, Birmingham, England
D. J. Blundell
Affiliation:
The University of Birmingham, Birmingham, England
R. E. G. Williams
Affiliation:
The University of Birmingham, Birmingham, England
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Measurements have continued with the 6 L counter which has proved reliable at pressures as high as 2.6 atm and as low as 0.3 atm. It has now been enclosed in a double ring of 27 geiger tubes which has reduced the background count to 10 cpm at 2 atm. So far, we have had no success with the 1.5 L Oeschger-type proportional counter. Failure to obtain steady readings is probably due to continued outgassing from the teflon insulation. All insulating parts have now been remanufactured from the same source of teflon as was used in the 6 L counter, and the Oeschger counter is being reassembled.

Results are still given without correction for δC13. Errors quoted refer only to the standard deviation calculated from a statistical analysis of count rates and the Libby half-life of 5570 ± 30 yr.

Type
Research Article
Information
Radiocarbon , Volume 10 , Issue 2 , 1968 , pp. 200 - 206
Copyright
Copyright © The American Journal of Science 

References

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