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Determination of global fallout plutonium isotopes using sector-field ICP-MS for rapid dating of recent sediments in Hongfeng and Chenghai Lakes, SW China
https://repo.qst.go.jp/records/68862
https://repo.qst.go.jp/records/688624a6e68be-adf0-4ec2-93d6-7751291d52ec
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2007-02-26 | |||||
| タイトル | ||||||
| タイトル | Determination of global fallout plutonium isotopes using sector-field ICP-MS for rapid dating of recent sediments in Hongfeng and Chenghai Lakes, SW China | |||||
| 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 | Accurate dating of lake sediments is important for many studies, such as the reconstruction of pollution history of organic pollutants and heavy metals, and the historical variation of lake biological productivity and/or carbon preservation. The most commonly used radionuclides for radiometric sediment dating are 210Pb and 137Cs. Recently, the potential of using Pu isotopes for the dating of recent aquatic sediments (<100 years age) has been considered. Taking into account the long half-lives of Pu isotopes (239Pu, t2/1= 2.44x104 yr; 240Pu, t2/1 = 6.58x103 yr), this dating technique established in our current generation could be a great legacy for next generations to study the history of anthropogenic pollutants in the environment. We applied a sector-field ICP-MS to establish the chronology of recent lake sediments in Chenghai and Hongfeng Lakes, SW China via measurements of Pu isotopes. The Pu activity profile obtained with SF-ICP-MS was in agreement with a  spectrometric 137Cs profile, indicating that the 137Cs and Pu activities convey essentially the same information about sedimentation processes in the investigated lakes. The inventory of 239+240Pu in sediment cores ranged from 35.4 to 50.7 Bq/m2, close to the expected global fallout inventory (36-42 Bq/m2) at this latitude band (200-400N). The average 240Pu/239Pu atom ratios in these two sediment cores are 0.195  0.021 for Chenghai Lake and 0.185  0.009 for Hongfeng Lake. The sources of Pu isotopes and the potential application of Pu isotopes for sediment dating will be discussed. |
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| 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 | 2007 European Winter Conference on Plasma Spectrochemistry | |||||
| 発表年月日 | ||||||
| 日付 | 2007-02-23 | |||||
| 日付タイプ | Issued | |||||
