Measurements of time variation of cosmogenic 14**C from 2500-year-old tree rings

Details Measurements of time variation of cosmogenic 14**C from 2500-year-old tree rings Measurements of time variation of cosmogenic 14**C from 2500-year-old tree rings

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc...10.4133m&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

1

Scientific paper

Although a few reports about the 14 C content in tree rings have been given for the 11-year periodicity of solar activity during the 18th-19th centuries, there are no data related to the 11-year cycle for more distant times (i.e. > 1000 year ago). To address this, we have started to measure, at single year intervals, the concentrations of 14 C in old tree rings of wood buried ca. 2500 years ago by a volcanic eruption. Our highly accurate 14 C measuring system is composed of a benzene synthesizer capable of producing a large quantity (10g) of benzene and a Quantulus 1220TM To estimate the calendar age of the wood, we carried out 14 C dating for five tree rings from the wood, sequentially separated by 40 years, 60 years, 60 years, and 45 years. From the results, the most probable age of the tree rings was 430 B.C., using Stuiver s calibration data. Also, with the accuracy of 0.2% the radiocarbon ages were measured for a sequence of the 11 single-year tree rings. The standard deviation of the 11 radiocarbon ages is 24.1yr BP for the average and it was slightly greater than the error of the measurement 21 yr BP.

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