WEKO3
アイテム
Artificial radionuclides recorded in recent sediments of Chinese lakes
https://repo.qst.go.jp/records/62922
https://repo.qst.go.jp/records/62922f63ff345-1526-4269-b7b5-ad4d78c70ae7
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2008-12-17 | |||||
| タイトル | ||||||
| タイトル | Artificial radionuclides recorded in recent sediments of Chinese lakes | |||||
| 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 |
Wu, Fengchang
× Wu, Fengchang× Zheng, Jian× Liao, Haiqing× Yamada, Masatoshi× Wan, Guojiang× Ｗｕ Ｆｅｎｇｃｈａｎｇ× 鄭 建× Ｌｉａｏ Ｈａｉｑｉｎｇ× 山田 正俊 |
|||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Establishing accurate historical records of the distribution, inventory and source of artificial radionuclides in the environmental are important for environmental monitoring and radiological health protection due to its high toxicity, and useful for identification and risk assessment of possible future environmental inputs of radionuclides from nuclear weapons test and from the accidental release from the nuclear fuel reprocessing propocess and power plant reactor. We applied a sector-field iCP-MS to study the recent sedimentation in ca. 20 lakes across China via measurements of both Pu isotopes, besides the conventional radiometric determination of 210Pb and 137Cs. The results show that the Pu activity profile was in agreement with the 137Cs profile in a sediment core of Lake Hongfeng. Inventories were 50.7 Bq/m2 foe 239+240Pu and 1586 Bq/m2 for 137Cs. the average 240Pu/239Pu atom ratio was 0.185 +/-0.009, indicating that Pu originated from global stratospheric fallout rather than from direct tropospheric or close-in fallout from the Chinese nuclear testing conducted in the 1970s. In the sediment core of lake Chenghai, the 240Pu/239Pu atom ratio ranged from 0.166 to 0.271 with a mean of 0.195 +/-0.021, which was slightly higher than that of global fallout. The 239+240Pu/137Cs activity ratios ranged from 0.0155 to 0.0411, with a mean of 0.0215, and the 239+240Pu inventory was 35.4 Bq/m2; both 239+240Pu/137Cs activity ratio and Pu inventory were close to those values of global fallout at 20-30 N. Three peaks were observed for both 137Cs and 239+240Pu activities in the examined sediment core; they most probably indicated the maximum deposition of global fallout between 1963 and 1964, the fallout from a series of Chinese nuclear tests during the 1970s, and the deposition of resuspended Pu-bearing particles from the Chernobyl accident. based on the isotopic compositions of Pu and isotopes and 137Cs distribuution, the sources of artificial radionuclides and teh potential application of Pu isotopes for sediment dating, and regional and global artificial effects were discussed. |
|||||
| 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 | 2008 Third Asia-Pacific Winter Conference on Plasma Spectrochemistry | |||||
| 発表年月日 | ||||||
| 日付 | 2008-11-21 | |||||
| 日付タイプ | Issued | |||||
