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Riken Natural Radiocarbon Measurements VI

Published online by Cambridge University Press:  18 July 2016

Fumio Yamasaki ,
Tatsuji Hamada  and
Chikako Hamada
Fumio Yamasaki
Affiliation:
Institute of Physical and Chemical Research (RIKEN) Yamato-machi, Kita-Adachi-gun, Saitama Pref., Japan
Tatsuji Hamada
Affiliation:
Institute of Physical and Chemical Research (RIKEN) Yamato-machi, Kita-Adachi-gun, Saitama Pref., Japan
Chikako Hamada
Affiliation:
Institute of Physical and Chemical Research (RIKEN) Yamato-machi, Kita-Adachi-gun, Saitama Pref., Japan
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The C14 dates given below are a continuation of the work presented in our previous list (Radiocarbon, 1969, v. 11, p. 451-462), and results obtained mainly during 1969 are described. A new 3.3 L copper counter was put into routine operation besides the 2.7 L stainless steel counter employed heretofore, yielding background counting rates of 8.5 and 5.5 cpm, respectively, when filled with dead CO2 at ca. 1.8 atm.

Type
Research Article
Information
Radiocarbon , Volume 12 , Issue 2 , 1970 , pp. 559 - 576
Copyright
Copyright © The American Journal of Science 

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