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The spectrometer has been used to measure ^\u003c14\u003eC concentrations of natural samples, as well as ^\u003c14\u003eC ages of geological and archeological samples. The Tandetron spectrometer measures ^\u003c14\u003eC/^\u003c13\u003eC ratios of carbon prepared from carbonaceous samples. The ratio of a young samples (^\u003c14\u003eC ages younger than several thousand years old) is routinely measured with a precision of \u00b11%, using a C-Ag mixture target containing only 2-5 mg of carbon, in a measurement lasting about 4 hours. Errors for older samples become larger, because of the smaller number of ^\u003c14\u003eC counts. The ^\u003c14\u003eC background level of the spectrometer, estimated by using old natural graphite, it about 3x10^\u003c-16\u003e in ^\u003c14\u003eC/^\u003c12\u003eC ratio. The Tandetron spectrometer has been applied to measure ^\u003c14\u003eC concentrations, \u0394^\u003c14\u003eC, of annual rings (1945-1983) from a Kiso hinoki tree (Japanese Cypress), to investigate the annual \u0394^\u003c14\u003eC variation of the atmospheric CO_2 ; the cause of variation could be addition of ^\u003c14\u003eC produced by nuclear weapon tests in late 1950\u0027s to early 1960\u0027s. The ^\u003c14\u003eC concentrations in pine needles, collected at the Higashiyama Campus of Nagoya University, have also been measured since 1983. The results in our ^\u003c14\u003eC measurement of pine needles are described in the present study, focusing on the annual changes in \u0394\u003c14\u003eC values of the atmoshperic CO_2,and on the effect upon ^\u003c14\u003eC concentrations for pine needles of a local ^\u003c14\u003eCO_2 emission from incineration of radioactive organic solvent wastes containing ^\u003c14\u003eC, which have been produced by biochemical experiments with ^\u003c14\u003eC tracer, at the Radioisotope Center in the Higashiyama Campus of Nagoya University.", "subitem_description_type": "Abstract"}]}, "item_9_identifier_registration": {"attribute_name": "ID\u767b\u9332", "attribute_value_mlt": [{"subitem_identifier_reg_text": "10.18999/sumrua.2.104", "subitem_identifier_reg_type": "JaLC"}]}, "item_9_publisher_32": {"attribute_name": "\u51fa\u7248\u8005", "attribute_value_mlt": [{"subitem_publisher": "\u540d\u53e4\u5c4b\u5927\u5b66\u5e74\u4ee3\u6e2c\u5b9a\u8cc7\u6599\u7814\u7a76\u30bb\u30f3\u30bf\u30fc 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