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Glasgow University Radiocarbon Measurements I

Published online by Cambridge University Press:  18 July 2016

M. S. Baxter ,
M. Ergin  and
A. Walton
M. S. Baxter
Affiliation:
Chemistry Department, The University, Glasgow, W.2.
M. Ergin
Affiliation:
Chemistry Department, The University, Glasgow, W.2.
A. Walton
Affiliation:
Chemistry Department, The University, Glasgow, W.2.
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Two radiocarbon counting systems have been established in the Chemistry Department, University of Glasgow, since late 1967.

The counting gas is methane, at pressures up to 10 atm, and 2 alternative procedures are followed for methane production, (a) high pressure synthesis in a stainless steel 4.5 1 reactor and (b) low pressure synthesis in an all glass flow-reactor. Both systems employ 0.5% ruthenium on alumina pellets as catalyst (Engelhard Industries Ltd.). Early samples synthesized with Air Products' hydrogen showed evidence of tritium contamination. This gas supply was later replaced with tritium-free hydrogen supplied by Messrs. Griesheim, Düsseldorf, Germany. Both detectors used for routine measurements are 0.5 1 internal gas counters supplied by Beckman Instruments Inc., California. The detectors are surrounded by a concentric-wall multiple anode anticoincidence counter. The entire counter assembly is encased within a 4-in.-thick lead shield manufactured from aged lead by J. Girdler and Co., London. Counter electronics, anticoincidence system and power supply are of Beckman design (Sharp and Ellis, 1965).

Type
Research Article
Information
Radiocarbon , Volume 11 , Issue 1 , 1969 , pp. 43 - 52
Copyright
Copyright © The American Journal of Science 

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