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Seasonal variation of Pu flux and Pu atom ratio in the west NOrthwestern Pacific
https://repo.qst.go.jp/records/62039
https://repo.qst.go.jp/records/620392a5708a4-d870-4c9e-9a2a-9d568bd193bc
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2007-03-26 | |||||
| タイトル | ||||||
| タイトル | Seasonal variation of Pu flux and Pu atom ratio in the west NOrthwestern Pacific | |||||
| 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_c94f | |||||
| 資源タイプ | conference object | |||||
| 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 |
Zheng, Jian
× Zheng, Jian× Yamada, Masatoshi× 鄭 建× 山田 正俊 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | We examined the vertical distributions of 239+240Pu activity and 240Pu/239Pu atom ratio in settling particles and quantified the particulate 239+240Pu fluxes in the water column in the western Northwest Pacific. Time-series settling particle samples were collected using sediment traps to examine the seasonal variation of Pu flux and 240Pu/239Pu atom ratio. Plutonium isotopes were analyzed using a sector field high resolution ICP-MS. To the best of our knowledge, this is the first time that both Pu activity and Pu isotope ratio data have been obtained for settling particles in the Pacific Ocean. The high (> 0.18) 240Pu/239Pu atom ratios in settling particles indicate that plutonium from the Pacific Proving Grounds (PPG) source in the central Pacific is transported toward the western Northwest Pacific. Evidence indicates that Pu scavenging onto the settling particles is strongly dependent upon the bulk mass flux. The results suggest that advective lateral transport of dissolved Pu from the open ocean to the ocean margin and removal of Pu into the margin sediments by particle scavenging is a common phenomenon in the Pacific Ocean, and it is likely to be also an important factor in a larger context for the geochemical cycling, i. e. the transport and dispersion of other contaminants that supplied directly from the atmosphere. The Pacific marginal sediments underlying waters with high biological productivity and large suspended sediment loads are major sinks for removal and sequestration of Pu and other contaminants that adsorb strongly to sediments. | |||||
| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 第8回環境放射能研究会 | |||||
| 発表年月日 | ||||||
| 日付 | 2007-03-24 | |||||
| 日付タイプ | Issued | |||||
