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Distribution of technetium-99 in surface soils
https://repo.qst.go.jp/records/53659
https://repo.qst.go.jp/records/53659a9cde6f6-0033-4823-b362-8105c0548e2a
| Item type | 会議発表論文 / Conference Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2006-05-29 | |||||
| タイトル | ||||||
| タイトル | Distribution of technetium-99 in surface soils | |||||
| 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_5794 | |||||
| 資源タイプ | conference paper | |||||
| 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 | Technetium-99 (99Tc) is an important fission product which has been widely distributed in the environment as a result of fallout from nuclear weapons testing. In order to improve our understanding of the behavior of 99Tc in the environment, it is essential that we obtain more reliable information on the levels, distribution and fate of 99Tc in the environment. In this study, the concentration of global fallout 99Tc, in several surface soil samples (0 - 20 cm) collected in Japan, were determined by ICP-MS. The range of 99Tc in rice paddy field, upland field and other soils determined in this study were 0.006 - 0.11, 0.004 - 0.008 and 0.007 - 0.02 Bq kg-1 dry, respectively. 137Cs was used as a comparative indicator for the source of 99Tc, because the fission yields from 235U and 239Pu were about the same (ca. 6%) for the two isotopes, and the behavior and distribution of 137Cs in the environment is reasonably well understood. The 137Cs contents in rice paddy field, upland field and other soils range between 1.7 - 28, 1.4 - 9.2 and <1.1 - 24 Bq kg-1 dry, respectively. The activity ratios of 99Tc /137Cs in all soil samples were (0.6 - 5.9) x 10-3. Most of the measured ratios were one order of magnitude higher than the theoretical one obtained from fission. However, this ratio in soil, presumably depends on not only both the characteristic of radionuclides and the soil, but also on their contents after deposition to the earth?s surface. |
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| 書誌情報 |
Distribution and Speciation of Radionuclides in the Environment : Proceedings of the International Workshop on Distribution and speciation of Radionuclides in the Environment, Rokkasho, Aomori, Japan, October 11-13, 2000 p. 38-44, 発行日 2001 |
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| 出版者 | ||||||
| 出版者 | Institute for Environmental Sciences | |||||
