@article{oai:kanazawa-u.repo.nii.ac.jp:00011057,
 author = {横山, 明彦 and 中西, 孝 and Kinoshita, Norikazu and Sumi, Takahiro and Takimoto, Kiyotaka and Nagaoka, Mika and Yokoyama, Akihiko and Nakanishi, Takashi},
 issue = {10},
 journal = {Science of the Total Environment},
 month = {Apr},
 note = {The geographical distribution of the anthropogenic radionuclides 238Pu and 239+240Pu in the Tropical East Pacific in 2003 was studied from the viewpoint of material migration. We measured the contents of Pu isotopes in seawater and in sediment from the sea bottom. The distributions of Pu isotopes, together with those of coexisting nitrate and phosphate species and dissolved oxygen, are discussed in relation to the potential temperature and potential density (sigma-θ). The Pu contents in sediment samples were compared with those in the seawater. Horizontal migration across the Equator from north to south was investigated at depths down to ~800m in the eastern Pacific. The Pu distribution at 0-400m correlated well with the distribution of potential temperature. Maximum Pu levels were observed in the subsurface layer at 600-800m, corresponding to the depth where sigma-θ≈27.0. It is suggested that the Pu distribution depends on the structure of the water mass and the particular temperature and salinity. The water column/sediment column inventory ratio and the vertical distribution of Pu may reflect the efficiency of scavenging in the relevant water areas. © 2011 Elsevier B.V., 金沢大学理工研究域物質化学系},
 pages = {1889--1899},
 title = {Anthropogenic Pu distribution in Tropical East Pacific},
 volume = {409},
 year = {2011}
}