Abstract
The Tandetron accelerator mass spectrometer was installed at Nagoya University in 1982. In addition to the investigation of sample preparation, radiocarbon measurements and the application to natural samples, tests have been performed by using graphitized carbon and carbon-silver targets. Of these, graphite targets give an ion beam current as high as 30 μA for 12C − ions and 14C-results with a precision of better than ± 0.4% in measurements of 14C/ 13C. C-Ag targets are also satisfactory and give a precision in the region of ± 2.0% for 14C/ 13C. 14C measurements of tree rings, grown from 1950 to 1983, give a maximum 14C concentration during 1964.
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