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Pu distribution in seawater and sediments in the Pacific off Fukushima after the FDNPP accident

https://repo.qst.go.jp/records/66370
https://repo.qst.go.jp/records/66370
a103efd3-5b19-4b23-bd1a-dd04d24d6182
Item type 会議発表用資料 / Presentation(1)
公開日 2017-07-14
タイトル
タイトル Pu distribution in seawater and sediments in the Pacific off Fukushima after the FDNPP accident
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

WEKO 653017

Zheng, Jian

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Aono, Tatsuo

× Aono, Tatsuo

WEKO 653018

Aono, Tatsuo

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Yamada, Masatoshi

× Yamada, Masatoshi

WEKO 653019

Yamada, Masatoshi

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Tagami, Keiko

× Tagami, Keiko

WEKO 653020

Tagami, Keiko

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Uchida, Shigeo

× Uchida, Shigeo

WEKO 653021

Uchida, Shigeo

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鄭 建

× 鄭 建

WEKO 653022

en 鄭 建

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青野 辰雄

× 青野 辰雄

WEKO 653023

en 青野 辰雄

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田上 恵子

× 田上 恵子

WEKO 653024

en 田上 恵子

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内田 滋夫

× 内田 滋夫

WEKO 653025

en 内田 滋夫

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抄録
内容記述タイプ Abstract
内容記述 To better understand the Pu contamination in the marine environment after the accident, we made a 4-years continuous investigation on the distribution of Pu isotopes in seawater and marine sediments. We determined Pu isotopes in seawater collected from the near coastal area (mostly within the 30 km zone) and from the open ocean 900 km away from the FDNPP site. The 239+240Pu activities were 4.16-5.52 mBq/m3 and the 240Pu/239Pu atom ratios varied from 0.221 to 0.295. These values were compared with the baseline data for Pu distribution in the western North Pacific and its marginal seas before the FDNPP accident. The results suggested that there is no significant Pu contamination in seawater from the accident. To fully understand this possible contamination of Pu isotopes from the FDNPP accident to the marine environment, we also collected marine sediment core samples within the 30 km zone around the FDNPP site in the western North Pacific about two years after the accident. Pu isotopes (239Pu, 240Pu, and 241Pu) and radiocesium isotopes (134Cs and 137Cs) in the samples were determined. The high activities of radiocesium and the 134Cs/137Cs activity ratios with values around 1 (decay corrected to 15 March 2011) suggested that these samples were contaminated by the FDNPP accident-released radionuclides. However, the activities of 239+240Pu and 241Pu were comparable with the background level before the FDNPP accident. The Pu atom ratios (240Pu/239Pu and 241Pu/239Pu) suggested that global fallout and the Pacific Proving Ground (PPG) close-in fallout were the main sources for Pu contamination in the marine sediments. As Pu isotopes are particle-reactive and they can be easily incorporated with the marine sediments, we concluded that the release of Pu isotopes from the FDNPP accident to the marine environment was negligible.
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 Actinides 2017
発表年月日
日付 2017-07-12
日付タイプ Issued
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