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Riken Natural Radiocarbon Measurements I

  • Fumio Yamasaki (a1), Tatsuji Hamada (a1) and Chikako Fujiyama (a1)

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Natural C14 measurements at the Institute of Physical and Chemical Research (RIKEN) became routine in 1962. The counters presently used are made of stainless steel with a volume of about 2.7 L. They are surrounded by 2.5 cm of pure lead, a ring of 22 propane gas-flow anticoincidence counters, about 10 cm of boric acid and 20 cm of iron. When filled with dead CO2 up to 2 atm, they gave a background counting rate of about 9 cpm (Hamada, 1960).

In this article, results obtained for geologic and archaeologic samples since 1962 are described. Dates have been calculated on the basis of the C14 half-life of 5568 yr, and 95% of NBS oxalic acid as modern standard. Correction for isotopic fractionation was not applied.

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References

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Date lists:
Gakushuin I Kigoshi, Tomikura and Endo, , 1962.
Gakushuin II Kigoshi, and Endo, , 1963.
Hamada, T., 1960, Study of the radiocarbon dating I: Rikagaku Kenkyusho Hokoku, v. 36, p. 635.
Japan Archaeological Association, ed., 1954, Toro: Mainichi Press.

Riken Natural Radiocarbon Measurements I

  • Fumio Yamasaki (a1), Tatsuji Hamada (a1) and Chikako Fujiyama (a1)

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