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Collaborative Laboratories for Advanced Decommissioning Science; Tohoku University*
JAEA-Review 2021-056, 98 Pages, 2022/02
JAEA-Review-2021-056.pdf:9.08MB
The Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency (JAEA), had been conducting the Nuclear Energy Science & Technology and Human Resource Development Project (hereafter referred to "the Project") in FY2020. The Project aims to contribute to solving problems in the nuclear energy field represented by the decommissioning of the Fukushima Daiichi Nuclear Power Station, Tokyo Electric Power Company Holdings, Inc. (TEPCO). For this purpose, intelligence was collected from all over the world, and basic research and human resource development were promoted by closely integrating/collaborating knowledge and experiences in various fields beyond the barrier of conventional organizations and research fields. The sponsor of the Project was moved from the Ministry of Education, Culture, Sports, Science and Technology to JAEA since the newly adopted proposals in FY2018. On this occasion, JAEA constructed a new research system where JAEA-academia collaboration is reinforced and medium-to-long term research/development and human resource development contributing to the decommissioning are stably and consecutively implemented. Among the adopted proposals in FY2019, this report summarizes the research results of the "Development of extremely small amount analysis technology for fuel debris analysis" conducted in FY2020. The fuel debris retrieved from the Fukushima Daiichi Nuclear Power Station (1F) is analyzed in the second building of the Okuma Analysis and Research Center. The characteristics of fuel debris, such as the mixture of nuclear fuel, reactor components, and concrete, are not clear, and its analysis will be the first attempt in the world. Understanding the properties of fuel debris is necessary for handling, criticality control, storage control, etc. A key technique is the chemical analysis of actinide nuclides. We develop sample pretreatment technology and separation/analysis process required for chemical analysis.
Collaborative Laboratories for Advanced Decommissioning Science; Tohoku University*
JAEA-Review 2020-064, 95 Pages, 2021/02
JAEA-Review-2020-064.pdf:9.48MB
JAEA/CLADS had been conducting the Nuclear Energy Science & Technology and Human Resource Development Project in FY2019. Among the adopted proposals in FY2019, this report summarizes the research results of the "Development of extremely small amount analysis technology for fuel debris analysis" conducted in FY2019.
Sr in urine samples by extraction chromatography coupled to ICP-MS/MSTomita, Jumpei; Takeuchi, Erina
no journal, ,
no abstracts in English
Zr and Mo in fuel debris by ICP-MS/MSHorita, Takuma; Akimoto, Yuji*; Kikuchi, Hikaru*; Do, V. K.
no journal, ,
no abstracts in English
Iwasaki, Maho; Suzuki, Tatsuya*; Yamamura, Tomoo*; Konashi, Kenji*; Shikamori, Yasuyuki*; Noguchi, Shinichi
no journal, ,
no abstracts in English
Sm by ICP-MS/MSHorita, Takuma; Akimoto, Yuji*; Do, V. K.
no journal, ,
Samarium-151(Sm) can be measured by liquid scintillation counting (LSC) or inductively coupled plasma mass spectrometry (ICP-MS). While the former method requires a complete radiochemical separation, the latter one must solve the isobaric interference from Europium-151 (Eu). In this study, we have been developing an analytical technique for Sm by ICP-tandem MS(ICP-MS/MS). The recent advances of MS/MS mode with a collision/reaction cell in mass spectrometry may enable sufficient removal of the mass spectroscopic interferences. Moreover, compared to LSC, ICP-MS is more rapid and more selective, and thus, it can simplify pretreatment process. As preliminary experiments, the selection of reaction gas for the separation of Sm from Eu were examined by checking the product ions of 
Sm and Eu produced by reactions with the various gases (H
, O, NH
, and NO). Our obtained data showed that in the reaction with NH, Sm formed a product ion at mass shift of 16, while the reaction tendency of Eu is different. Accordingly, the counts of Sm and Eu at the mass shift of 16 were 9842 [cps/
g/L] and 162 [cps/g/L], respectively. The difference in reactivity of Sm and Eu to NH gas can reduce interference of the Eu to the measurement of Sm.
Zr and Mo based on solid phase extraction combined with ICP-MS/MS, 1; Sequential chemical separation of Zr and Mo from NbFuruse, Takahiro; Do, V. K.; Aita, Rena; Ota, Yuki; Murakami, Erina; Tomitsuka, Tomohiro; Sano, Yuichi; Akimoto, Yuji*; Endo, Tsubasa*; Katayama, Atsushi; et al.
no journal, ,
In order to simplify the analysis of Zr and Mo in radioactive waste from conventional radiation measurement, we have considered analysis method combining solid-phase extraction and ICP-MS/MS. In this presentation, we report the results of a study on sequential chemical separation of Zr and Mo from Nb and sample matrix using ZR resin as a solid-phase extraction resin.
Sn in radioactive rubbles by ICP-MS/MSOta, Yuki; Do, V. K.; Furuse, Takahiro; Sano, Yuichi; Iwahashi, Hiroyuki; Homma, Shunta; Ichijo, Yurina; Kurosawa, Kiyoko*; Endo, Tsubasa*; Motoki, Yoshiaki*; et al.
no journal, ,
no abstracts in English
Pd in radioactive rubbles by ICP-MS/MSIwahashi, Hiroyuki; Do, V. K.; Furuse, Takahiro; Ota, Yuki; Homma, Shunta; Kurosawa, Kiyoko*; Motoki, Yoshiaki*; Hirosawa, Takashi
no journal, ,
The radiometric determination of beta emitting Pd (half-life of 6.5 million years) requires a multiple-step chemical separation and a time-consuming radioactive measurement. Inductively coupled plasma tandem mass spectrometry (ICP-MS/MS) with recent technological advances in interference removal by two quadrupole mass filters and a collision/reaction cell could be an alternative for highly sensitive analysis of long-lived radionuclides. In this study, we have developed an analytical method for the determination of Pd in concrete rubble by ICP-MS/MS combined with single-column chromatographic separation. A simplified procedure for the separation of Pd from concrete matrices was developed. The measurement condition was optimized to completely suppress the interference including the isobar Ag and the sample matrices. The application of the developed method to radioactive concrete rubble is under consideration.
Kazama, Hiroyuki; Sekio, Yoshihiro; Maeda, Koji; Konashi, Kenji*; Abe, Chikage*; Nagai, Yasuyoshi*; Suzuki, Tatsuya*
no journal, ,
Inductively coupled plasma mass spectrometry with triple quadrupoles (ICP-MS/MS) is one of the promising techniques for rapid and highly sensitive wet analysis of fuel debris in Fukushima Daiichi Nuclear Power Plant. The collision/reaction cell technology implanted in ICP-MS/MS is available option to eliminate isobaric interferences, being expected to simplify the pretreatment of fuel debris analysis. In this study, ICP-MS/MS measurements of 
U and 
Th with collision/reaction gases were performed. On the basis of their gas reactivity, analytical methods for U will be discussed.