WEKO3
アイテム
Technetium-99 Behavior in the Terrestrial Environment -Field Observations and Radiotracer Experiments-
https://repo.qst.go.jp/records/44153
https://repo.qst.go.jp/records/441537e14f791-b874-419a-917a-b79a507d93fa
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2006-06-05 | |||||
| タイトル | ||||||
| タイトル | Technetium-99 Behavior in the Terrestrial Environment -Field Observations and Radiotracer Experiments- | |||||
| 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 |
Tagami, Keiko
× Tagami, Keiko× 田上 恵子 |
|||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Obtaining data on 99Tc in the rice paddy field environment is important because Tc is a redox sensitive element. The behavior of Tc is expected to be different under upland field and rice paddy field conditions since the redox conditions in the soil environment differ. However, most of the data on the nuclide behavior in soil were obtained under upland field conditions. To understand the global fallout 99Tc distributions in soil samples collected in Japan, a simple and rapid separation method by ICP-MS was developed in order to determine low-levels of 99Tc in soil samples. Also, radiotracer experiments using soils under aerobic and anaerobic conditions were carried out to clarify the Tc behavior under paddy field conditions. The results of determination of global fallout 99Tc in Japanese soils indicated that the radionuclide had been accumulating in rice paddy fields. The mechanisms can be explained by the immobilization of Tc in soil under anaerobic conditions. From the radiotracer experiments, it was clear that under waterlogged conditions, the highly mobile TcO4- in soil was readily changed to other immobilized forms, such as TcO2, TcS2 and organically bound forms. To this immobilization, the microbial activity seemed to have an important role in Tc sorption reactions. When the soil, which was once kept in anaerobic conditions, was air-dried again and kept in aerobic conditions, the chemical forms of immobilized Tc did not change remarkably. Interestingly, the similar Tc behavior was observed in a real wet forest near the Chernobyl Reactor. |
|||||
| 書誌情報 |
Journal of Nuclear and Radiochemical Sciences 巻 4, p. A1-A8, 発行日 2003-06 |
|||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 1345-4749 | |||||
