2024-03-29T13:06:01Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00011317
2023-11-16T00:39:45Z
879:1183:1184:1220
名古屋大学東山キャンパス内の松葉の<14>^C濃度測定
<14>^C concentrations by accelerator mass spectrometry of pine needles collected at Higashiyama campus of Nagoya University
中村, 俊夫
Nakamura, Toshio
中井, 信之
Nakai, Nobuyuki
古川, 路明
Furukawa, Michiaki
open access
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
本文データは学協会の許諾に基づきCiNiiから複製したものである
A Tandetron accelerator mass spectrometer, constructed by the General Ionex Corporation, Mass., USA, has been installed at Nagoya University in 1982,to measure ^<14>C. The spectrometer has been used to measure ^<14>C concentrations of natural samples, as well as ^<14>C ages of geological and archeological samples. The Tandetron spectrometer measures ^<14>C/^<13>C ratios of carbon prepared from carbonaceous samples. The ratio of a young samples (^<14>C ages younger than several thousand years old) is routinely measured with a precision of ±1%, 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 ^<14>C counts. The ^<14>C background level of the spectrometer, estimated by using old natural graphite, it about 3x10^<-16> in ^<14>C/^<12>C ratio. The Tandetron spectrometer has been applied to measure ^<14>C concentrations, Δ^<14>C, of annual rings (1945-1983) from a Kiso hinoki tree (Japanese Cypress), to investigate the annual Δ^<14>C variation of the atmospheric CO_2 ; the cause of variation could be addition of ^<14>C produced by nuclear weapon tests in late 1950's to early 1960's. The ^<14>C concentrations in pine needles, collected at the Higashiyama Campus of Nagoya University, have also been measured since 1983. The results in our ^<14>C measurement of pine needles are described in the present study, focusing on the annual changes in Δ<14>C values of the atmoshperic CO_2,and on the effect upon ^<14>C concentrations for pine needles of a local ^<14>CO_2 emission from incineration of radioactive organic solvent wastes containing ^<14>C, which have been produced by biochemical experiments with ^<14>C tracer, at the Radioisotope Center in the Higashiyama Campus of Nagoya University.
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
1991-03
jpn
departmental bulletin paper
VoR
https://doi.org/10.18999/sumrua.2.104
http://hdl.handle.net/2237/13190
https://nagoya.repo.nii.ac.jp/records/11317
10.18999/sumrua.2.104
http://ci.nii.ac.jp/naid/110000475776/
名古屋大学加速器質量分析計業績報告書
2
104
112
https://nagoya.repo.nii.ac.jp/record/11317/files/KJ00000187507.pdf
application/pdf
414.1 kB
2018-02-20