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National Physical Laboratory Radiocarbon Measurements I

Published online by Cambridge University Press:  18 July 2016

W. J. Callow ,
M. J. Baker  and
D. H. Pritchard
W. J. Callow
Affiliation:
National Physical Laboratory, Teddington, England
M. J. Baker
Affiliation:
National Physical Laboratory, Teddington, England
D. H. Pritchard
Affiliation:
National Physical Laboratory, Teddington, England
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The dating equipment at the National Physical Laboratory was completed by the summer of 1960. A series of calibration and intercomparison measurements was undertaken however, using the NBS oxalic acid reference standard, a modern wood standard (1850 oak tree) and other material before starting routine measurements toward the end of 1961. All results have been obtained using a 4.5 L copper proportional counter filled with CO2 at a constant density corresponding to standard conditions of 22°C and an absolute pressure of 150 cm Hg. The counter is shielded by 8 in. of steel, 6 in. of paraffin wax containing boric oxide, 23 Geiger counters arranged as two independent groups and finally by 1 in. of mercury.

Type
Research Article
Information
Radiocarbon , Volume 5 , 1963 , pp. 34 - 38
Copyright
Copyright © The American Journal of Science 

References

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