| Issue |
EPJ Web of Conferences
Volume 24, 2012
Environmental Radioactivity 2010
|
|
|---|---|---|
| Article Number | 04001 | |
| Number of page(s) | 6 | |
| Section | Marine Radioactivity | |
| DOI | https://doi.org/10.1051/epjconf/20122404001 | |
| Published online | 04 April 2012 | |
https://doi.org/10.1051/epjconf/20122404001
Vertical distributions of 226Ra, 228Ra, and 137Cs activities in the southwestern part of the Sea of Okhotsk
1 Institute of Nature and Environmental Technology Kanazawa University, Japan
2 Fisheries Research Agency, National Research Institute of Fisheries Science, Japan
3 Japan Marine Science Foundation - Aomori, Japan
* E-mail: mutsuo@llrl.ku-unet.ocn.ne.jp
We collected 14 water column seawater samples in the southwestern part of the Sea of Okhotsk and employed low-background γ-spectrometry with convenient minimal radiochemical processing to determine the activities of 226Ra (half-life t1/2 = 1600 y), 228Ra (5.75y), and 137Cs (30.2 y) of the samples. All of these nuclides exhibited unique vertical profiles; 226Ra, 228Ra, and 137Cs activities exhibit small variations from 50–500 m depth (226Ra, ~ 2 mBq l−1; 228Ra, ~0.4 mBq l−1; 137Cs, ~ 1 mBq l−1); These profiles can be explained by convective mixing of surface water to this layer.
© Owned by the authors, published by EDP Sciences - SIF 2012
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