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Fate of Cs, Sr and U in soils affected by Fukushima Daiichi Nuclear Power Station Accident
https://repo.qst.go.jp/records/80347
https://repo.qst.go.jp/records/803472071da38-0b90-44c3-9c91-e3d45508b725
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2020-08-21 | |||||
| タイトル | ||||||
| タイトル | Fate of Cs, Sr and U in soils affected by Fukushima Daiichi Nuclear Power Station Accident | |||||
| 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 |
S.Kasar
× S.Kasar× N.Kavasi× Y.Omori× A.Sorimachi× T.Aono× S.K.Sahoo× Kasar, Sharayu× Kavasi, Norbert× Tatsuo, Aono× Sahoo, Sarata |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | On March 11, 2011 a massive earthquake and ensuing tsunami severely damaged the Fukushima–Daiichi Nuclear Power Station (FDNPS) resulting in hydrogen explosions at nuclear reactors. Although it is believed that nuclear material such as plutonium and uranium isotopes must have remained largely inside reactor, the chances of their release in environment should be considered. Consequently, the study of fate of radionuclides that could be present due to FDNPP accident is of great importance from the viewpoint of radioecology. In order to understand migration behavior of Cs, Sr and U, determination of sorption-desorption characteristics in contaminated soils from exclusion zone in Okuma town has been carried out in present work. Kd (distribution coefficient) values were established using batch method with stable isotopes as tracers. To estimate the source of contamination in soils, isotope ratios of uranium were measured using TIMS. Analytical chemical separation of U from digested soils was carried out with AER (AG 1 x 8)-UTEVA resins. Characterization of different soil parameters like particle size distribution, pH, organic content, cation exchange capacity (CEC), CaCO3, elemental and oxide composition of soil has been determined. Sorption coefficient, Kd(S) of Cs and Sr was found to be in the range of 65 to 2100 and 15 to 130 L/kg respectively. Kd(S) - U values varied from 30-36000 L/kg i.e. three orders of magnitude difference. High values of Kd(S) reflect more sorption capacity of soil for U and Cs than Sr. Values of desorption coefficient, Kd(D) for Cs and U were higher than values in the sorption process. This shows irreversibility of Cs and U sorption in soil as well as good retention capacity for actinides like U. The 235U/238U ratio did not show any enrichment of 235U in Fukushima soils. The 236U/238U isotope ratio value of the order of 10-7 in Fukushima soil showed mixing effect of global fallout and FDNPS accident. Details of the work will be presented in the conference. |
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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 | VII. Terrestrial Radioisotopes in Environment International Conference on Environmental Protection 10-13 AUGUST, 2020 (TREICEP 2020) | |||||
| 発表年月日 | ||||||
| 日付 | 2020-08-13 | |||||
| 日付タイプ | Issued | |||||
