RIKEN Natural Radiocarbon Measurements II

Abstract
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.

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