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Автор сообщения: Alexei
Дата и время сообщения: 26 April 2004 at 07:01:20:

В ответ на сообщение: Re: Сквознячок, поправьте если что не так

Кстати, у Левченко в статье есть же ссылки.
http://www.radiocarbon.org/Journal/v37n2/Abstracts/395.html
Location-Dependent Differences in the 14C Content of Wood

F. G. McCormac, M. G. L. Baillie, J. R. Pilcher and R. M. Kalin

The long 14C chronologies currently used as calibration curves combine results from wood that grew in the western United
States, the British Isles and Germany. Although these results show few significant differences in the 14C content of
contemporaneous wood when averaged over the length of the chronology (i.e., the means of overlapping sections of
chronology are the same), closer examination shows considerable variability. Separating the sections of chronology
according to the provenance of the wood used for calibration reveals patterns that suggest small but finite differences in the
14C content of wood from different locations. We conclude that there is some evidence that German and American wood give
dates older by between 20 and 40 yr from those of Irish oak for some periods. Additionally we suggest that the shift of the
Belfast 1986 calibration data by ca. 18 yr toward older dates may not be valid and that the resultant offset between the
Belfast 1986 and Seattle 1993 data shows a small but real difference in the 14C content of contemporaneous American,
German and Irish wood. Intralaboratory measurements made in Belfast on contemporaneous German and Irish oak, and
bristlecone pine and Irish oak, give offsets of 39 and 41 yr, respectively, with the Irish oak dating younger. Previous studies,
in which sample pairs of American and English and French wood were processed in the same laboratory, also showed
American wood to be slightly depleted in 14C. None of the findings of this study would significantly alter calibrated 14C
dates.

[Radiocarbon Volume 37, Number 2, 1995]


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