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AtSegawa, Mariko; Maeda, Makoto; Toh, Yosuke; Nishinaka, Ichiro*
no journal, ,
no abstracts in English
Yokoyama, Akihiko*; Uesugi, Masaki*; Matsui, Yoshiki; Umino, Yuji*; Kimura, Yoshiki; Yamaguchi, Tomoki
no journal, ,
Collaboration of JAEA and Kanazawa University has verified the analysis accuracy for the establishment of nuclear forensics uranium dating method by alpha-ray spectrometry. In the chemical separation, uranium standards are used to quantify Th-230 produced. In this case, the target for the existence ratio with U-234 is about 1/10000. Therefore, a recovery correction with a tracer was performed and the results were compared with those obtained by a mass spectrometer. In addition, we examined technical issues that contribute to improving analysis accuracy and speeding up analysis time.
Yomogida, Takumi; Higashi, Kotaro*; Kawamura, Naomi*; Kitatsuji, Yoshihiro; Takahashi, Yoshio*
no journal, ,
Biotite, a layered silicate mineral, is known to be a host phase for uranium(U) in U mines. There are still many unclear factors regarding its U accumulation mechanism. In this study, U adsorption experiment was conducted on artificially weathered biotite by removing interlayer potassium. The results showed that the ratio of reduced species of U increased with increasing the K loss ratio in interlayer, indicating that U reduction occurred at cleavages developed by weathering of the biotite.
MdAsai, Masato; Ishibashi, Yuichi*; Tsukada, Kazuaki; Sato, Tetsuya; Aoki, Ryota*; Ito, Yuta; Uchibaba, Yuta*; Orlandi, R.; Gong, G.-M.*; Suzaki, Fumi; et al.
no journal, ,
Measurement of mass and total kinetic energy (TKE) distribution for the spontaneous fission (SF) of Md has been performed to clarify the fission mechanism in the neutron-rich fermium region. Md nuclei were produced with the 
Es target and 
O beam, and mass-separated with an on-line isotope separator (ISOL). We discuss the mechanism of fission observed in the SF of Md on the basis of the observed mass-TKE distribution.
Ouchi, Kazuki
no journal, ,
I describe on the elucidation of the deposition following the oxidation state of uranium and the electrochemical behavior of uranium(IV) chloride in an ionic liquid-organic mixture, as a basic study of in-solution reactions. In addition, I describe on the development of separation methods for actinides using a microchemical chip and polyacrylamide gel electrophoresis, as an applied study for quantitative analytical methods for small amounts of samples.
in reaction cell in triple quadrupole inductively coupled plasma mass spectrometryKazama, Hiroyuki; Konashi, Kenji*; Suzuki, Tatsuya*; Sekio, Yoshihiro; Maeda, Koji; Koyama, Shinichi; Abe, Chikage*; Nagai, Yasuyoshi*
no journal, ,
Ultratrace analysis technique is important to understand fuel debris in nuclear reactor core after sever accident. Ion-molecule reactions of actinides (
Np, 
Am and 
Cm) in a reaction cell were measured by inductively coupled plasma mass spectrometry (ICP-MS/MS). These nuclides are included in fuel debris. A gas-phase ion-molecule reaction model has been developed to simulate the gas phase reactions in the reaction cell. The results of model simulation are good agreement with the flow rates dependences of experimental data accurately.
Tomita, Jumpei; Tomita, Ryohei; Suzuki, Daisuke; Yasuda, Kenichiro; Miyamoto, Yutaka
no journal, ,
Plutonium isotopic standard solution was impregnated into porous silica particles to prepare the Pu particles utilized for a single particle analysis for safeguards. SEM-EDS analysis showed that the prepared silica particles contained Pu. The isotope ratios of the Pu particles were determined with a multi-collector ICP-MS after decomposing individually. 
Pu/
Pu measured ratios agreed with the certified value within the 2
of standard deviation.
Tomita, Ryohei; Tomita, Jumpei; Suzuki, Daisuke; Yasuda, Kenichiro; Miyamoto, Yutaka
no journal, ,
In this study, we tried to solve the problem of electrostatic discharge on uranium particle based by porous silicon particle and to analyze uranium isotopic ratio of the uranium particle-based silicon by SIMS with high accuracy. Experimental results showed that primary beam of negative oxygen (O
) is effective to compensate charge of uranium particle-based silicon. The negative primary beam also enable us to analyze uranium isotopic ratio of the uranium particle-based silicon within 2 range of standard deviation.
Nishinaka, Ichiro*; Hashimoto, Kazuyuki
no journal, ,
no abstracts in English
Nakagawa, Taichi; Matsueda, Makoto; Terashima, Motoki; Takagai, Yoshitaka*
no journal, ,
no abstracts in English
Chiu, I.-H. ; Osawa, Takahito; Takeda, Shinichiro*; Katsuragawa, Miho*; Takahashi, Tadayuki*; Watanabe, Shin*; Kubo, Kenya*; Mizumoto, Kazumi*; Saito, Tsutomu*; Umegaki, Izumi*; et al.
no journal, ,
Non-destructive elemental analysis method has been developed for the materials by high-energy muon-characteristic X-rays measurement. To further improve the method, we have also utilized two-dimensional cadmium telluride hard X-ray detectors (CdTe-DSDs) for the muonic X-rays measurement to obtain the 3D elemental distribution of the sample. In this work, a 3D imaging system has been created using four CdTe-DSDs. The experiment of 3D elemental imaging for archaeological materials was performed using a negative muon beam at J-PARC/MUSE, and the three-dimensional distribution of silicon and oxygen was confirmed. This presentation introduces the research progress so far.
Chiu, I.-H. ; Osawa, Takahito; Nozawa, Takuya
no journal, ,
Prompt Gamma-ray analysis system (PGA) installed in JRR-3 has been fully automated with the introduction of a robot. Further upgrading is underway this year, and a helium gas recovery system and an automatic liquid nitrogen supply system are under development. In addition, a new carbon dioxide supply system has been installed to cope with the rising cost of helium. A measurement program is being developed by myself, and is scheduled to be integrated with an automatic analysis system.
Tokunaga, Kohei; Kozai, Naofumi; Takahashi, Yoshio*
no journal, ,
An important issue is to understand the behaviour of radionuclides in the natural environment and their recovery from the environment. This study focuses on siderite, which changes its chemical composition and crystal structure according to the dissolved oxygen in the environments, and aims to determine the uptake of uranium and arsenic during the transformation of the crystal phase from siderite to goethite and ferrihydrite in the Ningyo-Toge Centre.
Matsueda, Makoto; Kawakami, Tomohiko*; Teruyama, Yuko*; Terashima, Motoki; Iijima, Kazuki; Furukawa, Makoto*; Takagai, Yoshitaka*
no journal, ,
Determination of actinides (e.g., Th, U, Np, Pu, Am, Cm) in contaminated water and nuclear waste is important for decommissioning the Fukushima Daiichi Nuclear Power Station. However, traditional radiochemical analysis needs a time-consuming process and large effort. ICP-MS has the potential of rapid determination by simultaneous detection of actinides, while many isobaric interferences prevent the quantification. In this study, we developed an automatic analysis method using ICP-MS incorporating cascade separation steps (solid phase separation and gas phase reaction in the dynamic reaction cell) to simultaneously determine actinides.
Ra
ions for decay-recoil-correlated spectroscopyUchibaba, Yuta; Ito, Yuta; Sato, Tetsuya; Aoki, Ryota; Asai, Masato; Gong, G.; Tsukada, Kazuaki; Natori, Hina; Miyachi, Yuta; Nagame, Yuichiro*
no journal, ,
We have developed a Paul trap with an advanced electrode structure that allows for the detection of radiation and decay recoils over a large solid angle, aiming to perform identifications of radioactive ions by decay spectroscopy and precision mass spectroscopy combined with decay correlation. In order to measure the correlation between radiations and decay recoils from ions stored in the trap, we tested the performance of a semiconductor detector in the vicinity of radio-frequency electrodes and demonstrated in-trap decay measurements using Ra ions.