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  1. 原著論文

Global fallout Pu isotopes, 137Cs and 237Np records in the sediments of Lake Xingkai and their response to environmental changes in the catchment

https://repo.qst.go.jp/records/86055
https://repo.qst.go.jp/records/86055
3962305b-a8e9-4ff9-a8ee-f00a62091889
Item type 学術雑誌論文 / Journal Article(1)
公開日 2021-11-10
タイトル
タイトル Global fallout Pu isotopes, 137Cs and 237Np records in the sediments of Lake Xingkai and their response to environmental changes in the catchment
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 Zhang, Shuai

× Zhang, Shuai

WEKO 1052402

Zhang, Shuai

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Yang, Guosheng

× Yang, Guosheng

WEKO 1052403

Yang, Guosheng

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Zheng, Jian

× Zheng, Jian

WEKO 1052404

Zheng, Jian

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Pan, Shaoming

× Pan, Shaoming

WEKO 1052405

Pan, Shaoming

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Cao, Liguo

× Cao, Liguo

WEKO 1052406

Cao, Liguo

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Tatsuo, Aono

× Tatsuo, Aono

WEKO 1052407

Tatsuo, Aono

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Shinnosuke, Yamazaki

× Shinnosuke, Yamazaki

WEKO 1052408

Shinnosuke, Yamazaki

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Shen, Ji

× Shen, Ji

WEKO 1052409

Shen, Ji

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Zhang, Wenfang

× Zhang, Wenfang

WEKO 1052410

Zhang, Wenfang

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Wang, Yong

× Wang, Yong

WEKO 1052411

Wang, Yong

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Zhang, Shuai

× Zhang, Shuai

WEKO 1052412

en Zhang, Shuai

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Yang, Guosheng

× Yang, Guosheng

WEKO 1052413

en Yang, Guosheng

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Zheng, Jian

× Zheng, Jian

WEKO 1052414

en Zheng, Jian

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Tatsuo, Aono

× Tatsuo, Aono

WEKO 1052415

en Tatsuo, Aono

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Shinnosuke, Yamazaki

× Shinnosuke, Yamazaki

WEKO 1052416

en Shinnosuke, Yamazaki

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抄録
内容記述タイプ Abstract
内容記述 Plutonium (Pu) isotopes, neptunium-237 (237Np) and cesium-137 (137Cs) in the environment have emerged as important tools for promoting geochemical studies. To elucidate their source terms, deposition process, and the geochemical behavior, as well as their response to catchment environmental changes in lacustrine environment, 239, 240Pu, 137Cs and 237Np were determined for the first time in a sediment core collected from the Lake Xingkai. The 240Pu/239Pu atom ratios (0.163−0.178) in all sediment samples corresponded well with the typical global fallout value of ~0.18, indicating that there were no other significant radioactive source inputs. The activity concentrations of 239+240Pu, 137Cs, and 237Np were 0.010−1.030 Bq kg-1, 6.4−30.1 Bq kg-1, and (0.020−2.195)  10-3 Bq kg-1, respectively. They presented similar vertical distribution patterns, with a typical global fallout peak (15−16 cm) corresponding to the year of 1964. On the other hand, the 237Np/239Pu atom ratios exhibited a wide range (0.207−1.306), and showed a trend of increasing values with depth, implying different geochemical behaviors of these two elements. Using the advection–dispersion equation model (ADE), the obtained apparent dispersion coefficient of 237Np (0.58  0.09 cm2 yr-1) was higher than that of 239+240Pu (0.38  0.07 cm2 yr-1), indicating that Np has greater mobility than Pu. The total global fallout inventories of 239+240Pu, 137Cs, and 237Np were 145, 4592, and 0.291 Bq m-2, respectively. Approximately 46% of the total global fallout was derived from riverine input, indicating that severe soil erosion occurred in the catchment of Lake Xingkai in the past decades.
書誌情報 Catena

巻 215, p. 106276, 発行日 2022-08
出版者
出版者 elsevier
ISSN
収録物識別子タイプ ISSN
収録物識別子 0341-8162
DOI
識別子タイプ DOI
関連識別子 10.1016/j.catena.2022.106276
関連サイト
識別子タイプ DOI
関連識別子 https://doi.org/10.1016/j.catena.2022.106276
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