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Riken Natural Radiocarbon Measurements IV

Published online by Cambridge University Press:  18 July 2016

Fumio Yamasaki ,
Tatsuji Hamada  and
Chikako Fujiyama
Fumio Yamasaki
Affiliation:
Institute of Physical and Chemical Research (RIKEN) Komagome, Bunkyo-ku, Toyko, Japan
Tatsuji Hamada
Affiliation:
Institute of Physical and Chemical Research (RIKEN) Komagome, Bunkyo-ku, Toyko, Japan
Chikako Fujiyama
Affiliation:
Institute of Physical and Chemical Research (RIKEN) Komagome, Bunkyo-ku, Toyko, Japan
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The C14 dates given below are a continuation of the work presented in our previous list (RIKEN III), and have been obtained by counting CO2 at ca. 2 atm pressure in a 2.7 L stainless steel counter. Results obtained mainly during 1967 are described.

Shell samples were treated with 1% HCl to remove the outer 10%. Calcareous deposits on the surface, when observed, were removed by mechanical means.

Dates were calculated on the basis of the C14 half-life of 5568 yr and 95% NBS oxalic acid as modern standard. No correction was applied even for fresh water shell samples.

Type
Research Article
Information
Radiocarbon , Volume 10 , Issue 2 , 1968 , pp. 333 - 345
Copyright
Copyright © The American Journal of Science 

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