Measurement of Radiocarbon Content in Leaves from Some Japanese Sites

We have measured radiocarbon contents in leaves collected from 15 sites in Japan, including mountain areas and big city areas for last three years. Comparing the radiocarbon contents in various areas, high 14 C concentrations (80–100‰ as δ 14 C) are seen for the leaves from the mountain and country sites. On the contrary, low concentrations (5–40‰) were observed for the leaves from city region, especially near the road with heavy traffic. These results indicate that the atmosphere of the mountain and country sites in Japan is still clean but the CO 2 gas coming from fossil non-radioactive carbon significantly pollutes the atmosphere of the city sites. The value of δ 14 C for the mountain areas implies that 14 C produced by nuclear bomb test in 1960s still remains. The decrease of δ 14 C at heavy traffic sites in Tokyo is consistent with the increase of CO 2 concentration in the atmosphere assuming that almost all CO 2 gas in this region originates from the fossil fuel

Archaeology · Geography · Meteorology · Physical geography · Radiocarbon dating · Atmospheric and Environmental Gas Dynamics · Chemistry · Environmental Science · Geology and Paleoclimatology Research · Isotope Analysis in Ecology · Environmental Chemistry · Geology

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