WEKO3
アイテム
Development of ICP-MS based analytical method for the determination of radioactive Cs isotopes
https://repo.qst.go.jp/records/71377
https://repo.qst.go.jp/records/7137709a05fa2-76fb-4d6c-b658-3b6768d03fc4
| アイテムタイプ | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2013-11-29 | |||||
| タイトル | ||||||
| タイトル | Development of ICP-MS based analytical method for the determination of radioactive Cs isotopes | |||||
| 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 output | |||||
| 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 |
鄭, 建
× 鄭, 建× 田上, 恵子× ト, 文庭× 内田, 滋夫× 鄭 建× 田上 恵子× ト 文庭× 内田 滋夫 |
|||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Radioactive Cs isotopes are high yield fission products up to 6.535% and 6.236% for 135Cs and 137Cs, respectively, from thermal neutron fission of 235U. They can be released into the environment in nuclear events, such as the detonation of a nuclear weapon or nuclear reactor accident. In the fission chains for 135Cs and 137Cs, a shielding of 135Cs occurs due to neutron capture of its precursor, 135Xe, to form 136Xe, whereas production of 137Cs is unaffected. This process causes a high degree of variance of 135Cs/137Cs isotope ratio with source. Thus, the ratio of 135Cs/137Cs will be characteristic of the reactor operation and shutdown conditions. The determination of 135Cs by radiometric methods is very difficult and quite insensitive because of its long half-life and low-energy β-decay. Neutron activation analysis (NAA) and thermal ionization mass spectrometer (TIMS) have been investigated for 135Cs activity and 135Cs/137Cs isotope ratio analysis in environmental samples, but these techniques are expensive and not widely available. Recently, the analytical potential of ICP-MS for 135Cs, 137Cs activities and 135Cs/137Cs isotope ratio have been discussed in the studies of environmental radioactivity and nuclear forensics, but the analysis of environmental samples remains to be a great analytical challenge. In Japan, there has been no report on the analysis of 135Cs/137Cs isotope ratio in environmental samples since no method has been established for 135Cs analysis in the MEXT environmental radioactivity analytical method. Here we report a newly established ICP-MS based analytical method for the determination of 135Cs, 137Cs activities and 135Cs/137Cs isotope ratio in environment samples with an aim to obtain isotopic composition of radioactive Cs isotopes released from the Fukushima Daiichi nuclear power plant (FDNPP) accident. We propose that 135Cs/137Cs can be used as a powerful tracer for long-term estimation of the environmental mobility of the FDNPP accident related fission products since the currently used 134Cs/137Cs activity ratio will become unavailable in the future for identification of the FDNPP contamination due to the short half-life of 134Cs. The developed analytical method can be applied to the analysis of radioactive wastes for the accurate radiation dose assessment by 135Cs, and to nuclear fuel analysis to estimate nuclear fuel burn-up in the damaged reactors for reactor decommissioning in the future. |
|||||
| 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 | International Symposium on Nuclear Back-end Issues and the Role of Nuclear Transmutation Technology after the accident of TEPCO’s Fukushima Daiichi Nuclear Power Stations | |||||
| 発表年月日 | ||||||
| 日付 | 2013-11-28 | |||||
| 日付タイプ | Issued | |||||
