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Riken Natural Radiocarbon Measurements VII

Published online by Cambridge University Press:  18 July 2016

Fumio Yamasaki ,
Chikako Hamada  and
Tatsuji Hamada
Fumio Yamasaki
Affiliation:
Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama Pref., Japan
Chikako Hamada
Affiliation:
Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama Pref., Japan
Tatsuji Hamada
Affiliation:
Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama Pref., Japan
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The C14 dates given below are continued from our previous list (R., 1970, v. 12, p. 559–576), and results obtained mainly during 1970 are described. A 2.7 L stainless steel counter and a 3.3 L copper counter are used, yielding background counting rates of 5.5 and 8.5 cpm, respectively, when filled with dead CO2 at ca. 1.8 atm. Dates have been calculated on the basis of the C14 half-life of 5568 yr and 95% of NBS oxalic acid as modern standard.

Type
Research Article
Information
Radiocarbon , Volume 14 , Issue 1 , 1972 , pp. 223 - 238
Copyright
Copyright © The American Journal of Science 

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