Measurements of C-14 Concentration for 22 Single-Year Tree Rings of an Old Cedar ca. 2500 Years Ago

Details Measurements of C-14 Concentration for 22 Single-Year Tree Rings of an Old Cedar ca. 2500 Years Ago Measurements of C-14 Concentration for 22 Single-Year Tree Rings of an Old Cedar ca. 2500 Years Ago

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....7.4135s&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

The 14 C concentrations of 22 tree rings of ca. 2500 years ago have been measured at single-year intervals with a highly accurate liquid scintillation counting system Quantulus (≤0.2%). The calendar age of the wood sample was 477B.C.±20 by 14 C dating and the variation of 14 C during the era is similar to that of Maunder or Sporer era when sunspots were absent. The least squares ¨ fit of a sine function for the ^14 C of 22 single-year tree rings indicated the amplitude of 0.39% and the period of 11.5-year. It indicate that the tree rings of ca. 2500 years ago record 11-year solar variations for the 14 C concentrations.

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