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University of Tokyo Radiocarbon Measurements V

Published online by Cambridge University Press:  18 July 2016

Hiromi Kobayashi ,
Taeko Hirose ,
Miyoi Sugino  and
Naotune Watanabe
Hiromi Kobayashi
Affiliation:
Carbon Dating Laboratory, University of Tokyo, Tokyo, Japan†
Taeko Hirose
Affiliation:
Carbon Dating Laboratory, University of Tokyo, Tokyo, Japan†
Miyoi Sugino
Affiliation:
Carbon Dating Laboratory, University of Tokyo, Tokyo, Japan†
Naotune Watanabe
Affiliation:
Carbon Dating Laboratory, University of Tokyo, Tokyo, Japan†
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Most of the 14C measurements reported here were made between August 1970 and August 1972. Chemical treatment of samples and counting technique remain as described previously (R, 1968, v 10, p 144–148; 1971, v 13, p 97–102). We have added Houtermans-Oeschger type multi-anode anticoincidence gas proportional counter, manufactured by Tokyo Atomic, Japan. The central counter tube, which has several small holes, 5mm diam, is made of aluminized polyethylene foil, 0.06mm thick, with 72mm inside diam and 300mm sensitive length. The external counter tube is made of stainless steel 4mm thick, with 93mm inside diam and 350mm length. The anode wires of both counters are also made of stainless steel 0.05mm diam. The counters are surrounded by a paraffin shield 50mm thick and encased in a 250mm shield of steel on all sides. Acetylene is used as the counting gas at 753.3mm Hg (22 ± 1°C). Counting rates of background and 95% activity of NBS oxalic acid standard were 1.25 ± 0.02cpm and 14.39 ± 0.12cpm, respectively.

Type
Research Article
Information
Radiocarbon , Volume 16 , Issue 3 , 1974 , pp. 381 - 387
Copyright
Copyright © The American Journal of Science 

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