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Distributions of 239Pu and 240Pu concentrations and 240Pu/239Pu atom ratios and 239+240Pu inventories in a water column in the Eastern Indian Ocean: transport of Pacific Proving Grounds-derived Pu via the Indonesian throughflow
https://repo.qst.go.jp/records/84432
https://repo.qst.go.jp/records/84432db235362-8bb0-4914-81dd-6428e93d8832
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2021-06-03 | |||||
| タイトル | ||||||
| タイトル | Distributions of 239Pu and 240Pu concentrations and 240Pu/239Pu atom ratios and 239+240Pu inventories in a water column in the Eastern Indian Ocean: transport of Pacific Proving Grounds-derived Pu via the Indonesian throughflow | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Yamada, Masatoshi
× Yamada, Masatoshi× Zheng, Jian× Zheng, Jian |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The 240Pu/239Pu atom ratios in seawater from the eastern Indian Ocean were determined to identify their Pu sources and to propose the transport pathway of Pacific Proving Grounds (PPG)-derived Pu into the studied area. This is the first study by anyone on these Pu atom ratios in the Indian Ocean. The mean 240Pu/239Pu atom ratios were 0.207 in the South Australia Basin, 0.223 in the Perth Basin, 0.241 in the West Australia Basin, 0.232 in the Bay of Bengal and 0.225 in the Andaman Sea. The obtained 240Pu/239Pu ratios were clearly greater than the mean global fallout ratio of 0.18. These high atom ratios proved the presence of close-in fallout Pu from PPG nuclear tests. The relative contribution of global and PPG fallouts was evaluated by using the two-end-member mixing model. The 239+240Pu inventories originating from the PPG fallout were calculated as 2.9–14.9 Bq m-2, which corresponded to 19–31% of the total 239+240Pu inventory. A significant amount of the PPG-derived Pu has been transported to the eastern Indian Ocean. The proposed transport pathway accounting for the high 240Pu/239Pu ratio is the transportation of PPG-derived Pu by the North Equatorial Current followed by the Mindanao Current, Indonesian Throughflow, and then spreading over the Indian Ocean by its surface circulation system. |
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| 書誌情報 |
Environmental Science & Technology 巻 55, 号 20, p. 13849-13859, 発行日 2021-10 |
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| 出版者 | ||||||
| 出版者 | ACS | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0013-936X | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1021/acs.est.1c03575 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://pubs.acs.org/doi/abs/10.1021/acs.est.1c03575 | |||||
