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Use of rhenium as a chemical analogue of technetium in soil-to-plant transfer systems
https://repo.qst.go.jp/records/68497
https://repo.qst.go.jp/records/68497b6e6eb28-c96d-4233-b4cc-62fc6be55d82
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2006-06-19 | |||||
| タイトル | ||||||
| タイトル | Use of rhenium as a chemical analogue of technetium in soil-to-plant transfer systems | |||||
| 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 | The long-lived radionuclide Tc-99 is produced in the fissions of U-235 and Pu-239 at relatively high ratio and the nuclide is thought to be highly mobile in biogeochemical cycles. Indeed, a TF of 5 (on wet weight basis) in the edible parts of common plants was recommended as allowable by the IAEA for Tc. However, its long-term behavior in the environment is not clear because Tc is a redox sensitive element. To understand the long-term behavior of Tc-99 in the environment, it would be better to measure Tc-99 in environmental samples, however, the amount in the natural environment is too small to measure. We focused on Re instead of Tc because both elements show chemical similarities. Rhenium, which is known as one of the most rarest elements in the earth's crust, can be measured by inductively coupled plasma mass spectrometry. But, in soil-to-plant systems, it was not clear whether Tc and Re were taken up by plants similarly or not. A radiotracer experiment was carried out to compare the plant uptake ratios of Tc and Re from nutrient solutions. Radish plants were transplanted to nutrient solution culture containers separately. The solution was contaminated with Tc-95m and Re-183. At 3 days after the transplanting, the nutrient solution was collected and the plants were separated into three parts (leaves, fleshy and fine roots) then each sample was oven-dried at 60C. The Tc-95m and Re-183 activities in the solution and the plant parts were measured with Ge detecting systems (Seiko EG&G Ortec). The average concentration ratios of Tc-95m and Re-183 in the nutrient solutions after/before the exposure were almost 1 for both radionuclides. The results suggested that Tc and Re absorption rates by the plant were almost the same as water uptake. The Tc and Re absorbed through the fine roots were distributed to the leaves and fleshy roots. The distribution ratio for Tc and Re, defined as 'activity in a plant part' divided by 'total absorbed activity', were depended on the plant species, however, the distribution ratios for Tc and Re were almost the same in a plant samples. Possibly, Re can be used as the chemical analogue of Tc in soil solution to plant uptake. |
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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 | 11th International Congress of the International Radiation Protection | |||||
| 発表年月日 | ||||||
| 日付 | 2004-05-28 | |||||
| 日付タイプ | Issued | |||||
