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University of Cambridge Natural Radiocarbon Measurements XIV

Published online by Cambridge University Press:  18 July 2016

V R Switsur  and
R G West
V R Switsur
Affiliation:
Sub-department of Quaternary Research, 5 Salisbury Villas, Station Road, Cambridge, England
R G West
Affiliation:
Sub-department of Quaternary Research, 5 Salisbury Villas, Station Road, Cambridge, England
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The dates presented in this paper comprise results of determinations made at the University Radiocarbon Dating Research Laboratory, mostly during the latter half of 1974. Radioactivity was measured with proportional counters using pure carbon dioxide at 2 atmospheres pressure as filling gas. Effects of cosmic and local environmental radiation on the counters were reduced by surrounding them completely with 1) a plastic scintillator anticoincidence shield, 7.5cm thick, viewed by 2 photomultiplier tubes operating in coincidence mode, the output pulses of which were in anticoincidence with the proportional counters signals, and 2) by a 17.5 ton lead castle.

Type
Research Article
Information
Radiocarbon , Volume 17 , Issue 3 , 1975 , pp. 301 - 312
Copyright
Copyright © The American Journal of Science 

References

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