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Distributions of selenium, iodine, lead, thorium and uranium in Japanese river waters
https://repo.qst.go.jp/records/68866
https://repo.qst.go.jp/records/6886646d465ec-3ab4-44b4-ab33-ae056cdb14bc
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2007-03-06 | |||||
| タイトル | ||||||
| タイトル | Distributions of selenium, iodine, lead, thorium and uranium in Japanese river waters | |||||
| 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 |
Tagami, Keiko
× Tagami, Keiko× Uchida, Shigeo× 田上 恵子× 内田 滋夫 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Long-lived radionuclides released from nuclear facilities, such as deep underground disposal facilities, could reach humans through several transfer paths in the environment. Uses of ground water and river water for agricultural field irrigation and for drinking water are important paths. In order to understand behavior of long-lived radionuclides in the terrestrial water environment, we carried out a natural analogue study, that is, measurement of selenium (Se), iodine (I), lead (Pb), thorium (Th) and uranium (U) concentrations in 45 Japanese rivers at 10 sampling points from the upper stream to the river mouth for each river. The cumulative probability distributions of Se, I, Pb, Th and U concentrations were on log-normal lines and their geometric mean concentrations were 0.057, 1.4, 0.039, 0.0055, 0.0109 ng/mL, respectively. The concentrations of I, Th and U in each river increased when the sampling points were nearer the river mouth, while that of Se were almost constant. For Pb, the highest value was observed in the middle part of each river in many cases. When Th and U concentrations were compared, 90% of the sampled water had higher U/Th concentration ratio than those observed in agricultural field (0.5). Mobility of U in rock and soil would be higher than that of Th so that the concentration ratio was increased. Moreover, addition of phosphatic fertilizers to agricultural field enhances U concentrations in river waters. We also measured more 40 elements and made a database of elemental compositions for Japanese river waters. The details will be also discussed together with the results of Se, I, Pb, Th and U. Acknowledgement: This work has been supported by the Agency for the Natural Resources and Energy, the Ministry of Economy, Trade and Industry (METI), Japan. |
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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 | the 33th Waste Management Symposium (WM'07) | |||||
| 発表年月日 | ||||||
| 日付 | 2007-03-01 | |||||
| 日付タイプ | Issued | |||||
