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RIKEN Natural Radiocarbon Measurements II

Published online by Cambridge University Press:  18 July 2016

Fumio Yamasaki
Affiliation:
Institute of Physical and Chemical Research (RIKEN), Komagome, Bunkyo-ku, Tokyo, Japan
Tatsuji Hamada
Affiliation:
Institute of Physical and Chemical Research (RIKEN), Komagome, Bunkyo-ku, Tokyo, Japan
Chikako Fujiyama
Affiliation:
Institute of Physical and Chemical Research (RIKEN), Komagome, Bunkyo-ku, Tokyo, Japan
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The C14 dates given below are a continuation of the work presented in our first list (RIKEN I), and have been obtained by counting CO2 at about 2 atm pressure in a 2.7-L stainless steel counter. In this article, results obtained during 1964-65 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.

Type
Research Article
Copyright
Copyright © The American Journal of Science 

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