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Transfer factors of radionuclides from soil to rice and wheat
https://repo.qst.go.jp/records/68487
https://repo.qst.go.jp/records/68487e210cf6c-c5bc-4d2f-b2c9-d4be3922529e
| 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 | Transfer factors of radionuclides from soil to rice and wheat | |||||
| 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 |
Uchida, Shigeo
× Uchida, Shigeo× Tagami, Keiko× Hirai, Ikuko× et.al× 内田 滋夫× 田上 恵子× 平井 育子 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Ingestion of crops and livestock products contaminated with radionuclides is the most important pathway through which the nuclides are taken into the human body. Eating habits, however, differs by countries. For example, in European and North American countries, livestock products, i.e. meat, eggs and milk, make a big contribution, whereas, in Asian and South American countries, crops including cereals and vegetables are the main contributors. From the viewpoint of more precise radiological assessment, it is necessary to obtain local transfer factors (TFs) for long-lived radionuclides from soil to crops, because climates, soil types and vegetations influence the TFs. However, the reported TF number obtained under natural conditions is quite limited, because only a few radionuclides, i.e. Cs-137 and Sr-90, have been determined in environmental samples. To close the gap, stable isotopes could be measured their concentrations in soil, rice and wheat by inductively plasma mass spectrometry (ICP-MS) and the local TFs were obtained alternatively. In this study, we especially focused on the TFs for rice. The transfer of elements from paddy soil to rice plants is interesting, because rice plants are grown under waterlogged conditions. Besides, rice is staple diet for the people who live in Southeast Asian countries including Japan. Also, TFs for wheat will be discussed, because both crops are classified into cereals and there are many TFs for wheat in Europe and North Amrica. After digestion of the plant and soil samples with mineral acids using a microwave digester, the samples were evaporated to dryness and the residue was dissolved in 20 mL of 2% nitric acid. About 30 elements, including U and Th, in both plant and soil samples were measured by ICP-MS after diluting the solution to a suitable concentration. The TFs were calculated from the concentrations of the elements in both plant and soil samples. The TF is defined as the concentration of an element in plant (in mg/kg dry weight (DW)) divided by the concentration of the element in soil (in mg/kg DW). The obtained TFs of Cs for rice and wheat were compared with the TFs of Cs-137 obtained by gamma spectrometry. The TFs of stable elements that were detected by ICP-MS for polished rice were lower than those for leafy vegetables. The TF values for Cu, Zn Rb and Cd were ranged from 0.1 to 0.3, which were the highest among the TFs obtained in this study. The TF of Sr was ranged from 10E-3 to 10E-2 and the value of Cs was in the order of 10E-3. The TFs for wheat were similar to those for rice. |
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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 | |||||
