Variation of Radiocarbon Concentration in Modern Wood

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1) Using the tree ring samples, the variation of C-14 concentration in the atmosphere since 1782 has been measured by the use of trees growing in Japan. The results show a constant concentration of C-14 in the atmosphere during 1782 and 1950 within the error of 2%.<BR>2) The depletion of C-14 concentration in the atmospheric carbon dioxide between 1782 and 1950 seems to be less than 2%.<BR>3) The observed annual variations on the samples from Tokyo, Akita and Mie Prefectures show almost the same amount of increase after 1953. There is a good agreement between our data and those on the tree ring samples taken in California by Bien and Suess. The concentration of C-14 in the atmosphere averaged over a year seems to have little difference in the temperate zone of the northern hemisphere.<BR>4) The variation of C-14 concentration in the atmosphere of the southern hemisphere seems to follow that of the northern hemisphere with a time lag of several months.

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