オーラルセッション
- 第1日 5月11日（月） 16:30～16:50 B会場（1202）
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1B-O2-1630 PDF
加速器質量分析を用いた海水中の10Be濃度の分布図
Cosmogenic nuclide Be-10 (half-life 1.36 Ma) is produced by nuclear interaction between secondary cosmic ray and atmospheric nitrogen and oxygen. Because of Be-10 widely spread in the ocean and the residence time is shorter than ocean-mixing time, the Be-10 concentrations in seawater could be a useful tracer for the ocean circulation. It is necessary accumulation of oceanic Be-10 to assess Be-10 as a tracer for mass transport. In this presentation, the transection of Be-10 concentration shows in the Indian Ocean and the Southeast Pacific during R/V Hakuho-maru in the KH09-5 and KH03-1 cruise, respectively, and discuss a migration of Be-10.