2024-03-29T13:52:28Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00011338
2023-11-16T00:22:11Z
879:1183:1184:1221
Measurements of <14>^C concentrations of stratosphric CO_2 using a tandetron accelerator mass spectrometer
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
中村, 俊夫
79576
Nakamura, Toshio
79577
中澤, 高清
79578
Nakazawa, Takakiyo
79579
町田, 俊信
79580
Machida, Toshinobu
79581
中井, 信之
79582
Nakai, N.
79583
北川, 浩之
79584
Kitagawa, H.
79585
松本, 英二
79586
Matsumoto, E.
79587
本田, 秀之
79588
Hond, H.
79589
伊藤, 富造
79590
Itoh, T.
79591
1992-03
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%.
departmental bulletin paper
名古屋大学年代測定資料研究センター 天然放射性元素測定小委員会
1992-03
名古屋大学加速器質量分析計業績報告書
3
150
162
jpn
名古屋大学年代測定資料研究センター 天然放射性元素測定小委員会
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