@article{oai:nagoya.repo.nii.ac.jp:00011338,
 author = {中村, 俊夫 and Nakamura, Toshio and 中澤, 高清 and Nakazawa, Takakiyo and 町田, 俊信 and Machida, Toshinobu and 中井, 信之 and Nakai, N. and 北川, 浩之 and Kitagawa, H. and 松本, 英二 and Matsumoto, E. and 本田, 秀之 and Hond, H. and 伊藤, 富造 and Itoh, T.},
 journal = {名古屋大学加速器質量分析計業績報告書},
 month = {Mar},
 note = {Air samples of about 16 liter in STP were collected from the stratosphere at altitutes of 18,20,21,23,24,26,27,29,30km, by a cryogenic-sampling apparatus with a liquid helium cooling system, on 1 September 1989,off Sanriku-Shore, Miyagi Prefecture, Northeastern part of Japan. The sampling apparatus was flown up to the stratosphere by a balloon at the Sanriku balloon station (39.2N, 141.8W) of the Institute of Space and Astronautical Scinece. Carbon dioxide of a few mg of carbon was separated from air samples with a cryogenic method at Tohoku University, and ^<14>C concentrations of the CO_2 were measured with a Tandetron accelerator mass spectrometer at Nagoya University for a Fe-graphite target prepares by reducing CO_2 on Fe-powder with hydrogen in a Vycol tube at 500C. The ^<14>C concentrations, Δ^<14>C, of CO_2 were 270-310%. at altitudes of 21-30km, and 130%. at 18-20km. The Δ^<14>C values at 21-30km were higher than the Δ^<14>C of the current tropospheric CO_2 of around 100-150%.},
 pages = {150--162},
 title = {タンデトロン加速器質量分析計による成層圏大気中CO_2 の<14>^C濃度測定},
 volume = {3},
 year = {1992}
}