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University of Cambridge Natural Radiocarbon Measurements XIII

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 here were calculated from measurements made at the University Radiocarbon Dating Research Laboratory mostly during 1973–74. The radioactivity of the samples was counted in gas proportional detectors, either silica lined (de Vries et al, 1959) or of pure copper, filled to 2 atmospheres pressure with pure carbon dioxide. The detectors were fixed in, and completely surrounded by, a plastic scintillator anticoincidence shield mounted inside a massive lead shield to protect against environmental radiation (Switsur, Hall and West, 1970). Modern sample gas was obtained from the combustion of ad 1845 to 1855 rings of an oak tree grown near Cambridge and felled in 1950. Background samples were prepared from Welsh anthracite. The contemporary sample was frequently compared with the activity of the NBS oxalic acid international standard. Age calculations were based on the 14C half-life of 5568 years and the uncertainty stated as one standard deviation calculated from the statistical analyses of sample and standards counting rates.

Type
Research Article
Information
Radiocarbon , Volume 17 , Issue 1 , 1975 , pp. 35 - 51
Copyright
Copyright © The American Journal of Science 

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