Recruitment for Postdoctoral Fellow
(Fixed-term researcher)

1. Physics	Chemistry	Mathematics	Geo and Environemtal Sciences	Biology	Radiation
   Mechanics	Material	Electricity and Electronics	Architectural and Civil Engineering	Applied Physics	Applied Chemistry
   Chemical Engineering	Measurements and Instruments	Computer and Information	Nuclear Nonproliferation and Nuclear Security	Other	All

2. No	Theme
   	Department	Section	Location	Contact Person	Radiation Worker/ Non-Radiation Worker	Field (for reference）
   	Summary
   J2	Study on feasibility and effectiveness evaluation for severe accident countermeasures
   	Nuclear Safety Research Center	Severe Accident Analysis Research Group	Nuclear Science Research Institute	Tomoyuki Sugiyama Tel: +81-29-282-5253 E-mail: sugiyama.tomoyuki@jaea.go.jp	Non-Radiation Worker	Physics, Chemistry, Mechanics, Applied Physics, Chemical Engineering, Other
   	This research aims at development of analysis models and tools to improve evaluation techniques of severe accident countermeasures. One of the following tasks or that related to the tasks is carried out. - Source term analysis of Fukushima daiichi NPS accident using the SA analysis code THALES2/KICHE. - Analysis of fluid dynamic behaviors of core melt in containment vessel using the mechanistic FCI code JASMINE. - Analysis of thermal-hydraulic and deflagration/detonation behaviors of hydrogen in containment vessel or reactor building using the open CFD code OpenFOAM.
   J3	Experimental and analytical studies on the fuel behavior under accident conditions of light-water-reactor
   	Nuclear Safety Research Center	Fuel Safety Research Group	Nuclear Science Research Institute	Masaki　Amaya Tel: +81-29-282-5028 E-mail: amaya.masaki@jaea.go.jp	Non-Radiation Worker	Mechanics, Material, Electricity and Electronics, Measurements and Instruments, Computer and Information, Physics, Chemistry
   	The objective of this study is to develop and/or improve models concerning fuel behavior under reactivity-initiated accidents (RIAs), loss-of-coolant accidents (LOCAs), etc. by conducting experiments on light-water-reactor fuel and/or analyses using calculation codes etc. The following or related studies will be carried out. ・Model development and evaluation by using calculation codes etc., concerning effects of the deformation of fuel cladding tube and axial relocation of fuel pellets inside the fuel rod on the fuel temperature during LOCAs. ・Analysis and model improvement in terms of fuel dispersal behavior following failures of fuel cladding tube during accidents by using calculation codes etc.
   J5	Study on the methodology of estimation of property changes in radioactive waste disposal system due to natural events
   	Nuclear Safety Research Center	Environmental Safety Research Group	Nuclear Science Research Institute	Seiji Takeda Tel: +81-29-282-6170 E-mail: takeda.seiji@jaea.go.jp	Non-Radiation Worker	Physics, Chemistry, Geo and Environemtal Sciences, Computer and Information, Architectural and Civil Engineering, Measurements and Instruments
   	In the safety assessment for a geological disposal of radioactive wastes, it is important to estimate the effect of property changes in radioactive waste disposal system resulting from the occurrence of natural events such as volcanic and magmatic activity, seismic activity, uplifts and denudation etc.. In this study, the methodologies for estimating the possibility of the occurrence and the effect of topographical, hydrological/hydrogeological, physical and geochemical response to geological and/or climatic factors are developed using previous observation and data characterized by the factors in Japan.
   J6	Study on release and transport behavior of radioactive materials in reprocessing plant under severe accident conditions
   	Nuclear Safety Research Center	Fuel Cycle Safety Research Group	Nuclear Science Research Institute	Hitoshi Abe Tel: +81-29-282-6672 E-mail: abe.hitoshi@jaea.go.jp	Non-Radiation Worker	Chemistry, Physics, Chemical Engineering
   	Newly defined as as severe accidents in fuel reprocessing plant are organic solvent fire in cell as well as boiling and exsiccation of highly-active liquid waste in concentrators. Therefore, establishment of method for evaluating their effect on the public dose and effectiveness of countermeasures for the accidents become an urgent issue. Purposes of this study are 1) acquiring data about release, transport and confinement of radioactive materials under the accident conditions and 2) establishing a simulation code to evaluate the accident evolution with high applicability.
   J7	Study on analytical techniques for individual particles containing nuclear materials in environmental samples
   	Nuclear Safety Research Center	Research Group for Safeguards Analytical Chemisty	Nuclear Science Research Institute	Fumitaka Esaka Tel: +81-29-282-6165 E-mail: esaka.fumitaka@jaea.go.jp	Radiation Worker	Chemistry, Physics
   	Analysis of trace amounts of nuclear materials in environmental samples taken at nuclear facilities in the world is performed to reveal nuclear activities, which is important for nuclear safeguards. In this study, analytical techniques for such samples are developed. For example, in order to clarify elemental composition, chemical states and isotopic composition, individual micron-sized particles containing uranium and/or plutonium are measured by using scanning electron microscopy, total-reflection X-ray analysis, micro-Raman spectroscopy and secondary ion mass spectrometry.
   J9	Study on a Level 3 Probabilistic Risk Analysis of nuclear power plants
   	Nuclear Safety Research Center	Radiation Risk Analysis Research Group	Nuclear Science Research Institute	Masanori Kimura Tel: +81-29-282-5459 E-mail: kimura.masanori@jaea.go.jp	Non-Radiation Worker	Physics, Chemistry, Mathematics, Geo and Environemtal Sciences, Radiation, Architectural and Civil Engineering, Computer and Information
   	A level 3 probabilistic risk assessment (PRA) is an offsite consequence analysis for a severe accident and estimates the frequency and severity of the consequences to the public. Probabilistic accident consequence assessment models and computer codes are an integral part of level 3 PRA of nuclear power plants. Our research group has developed a level 3 PRA code, OSCAAR. In this theme, researches on the probabilistic accident consequence assessment for health effects and economic consequence are conducted considering site-dependent on metrological, population, agricultural and economic data by using OSCAAR.
   J11	Study on the methodology of the structural integrity assessment for nuclear reactor components
   	Nuclear Safety Research Center	Structural Integrity Research Group	Nuclear Science Research Institute	Yinsheng Li Tel: +81-29-282-6457 E-mail: li.yinsheng@jaea.go.jp	Non-Radiation Worker	Mechanics, Architectural and Civil Engineering, Material, Physics, Applied Physics, Measurements and Instruments, Computer and Information
   	Due to the long term operation of some domestic nuclear power plants and occurrence of the earthquakes beyond the designed seismic ground motion, developing the methodologies of structural integrity assessments for the reactor components concerning seismic loading, impact loading and age related degradation mechanisms such as neutron irradiation embrittlement, stress corrosion cracking and so on is of great importance. In this theme, one of the following related researches will be conducted. - Advanced structural integrity assessment research for important nuclear components, such as failure estimation, crack propagation or weld residual stress evaluation, on the basis of numerical simulation, material testing, and fracture testing and so on - Advanced seismic safety and impact assessment research including development of three-dimensional evaluation models of nuclear facility buildings, components and piping systems, and numerical simulation considering nonlinear mechanical properties.
   J12	Research on Criticality Safety/Management of Damaged- or Molten-Fuel formed by Severe Accidents
   	Nuclear Safety Research Center	Criticality Safety Research Group	Nuclear Science Research Institute	Kotaro Tonoike Tel: +81-29-284-3762 E-mail: tonoike.kotaro@jaea.go.jp	Radiation Worker	Physics, Computer and Information, Applied Physics, Other
   	It is important to establish both the cooling and the criticality control of fuel debris after the severe accident, such as the Fukushima Daiichi accident, where large amount of fuel is damaged and melts. It is difficult, however, to control the situation of fuel debris and the coolant flow path, which leads the difficulty in securing the subcritical condition. Thus, the evaluation of re-criticality risk is necessary. In this research, critical mass, kinetic parameters, etc. of fuel debris will be obtained by computation; and critical experiments to validate the computation will be studied as well.
   J13	Experimental and theoretical studies of exotic nuclei
   	Advanced Science Research Center	Sector of Nuclear Science Research	Nuclear Science Research Institute	Katsuhisa Nishio Tel: +81-29-282-5454 E-mail: nishio.katsuhisa@jaea.go.jp	Radiation Worker	Physics, Mathematics, Radiation, Applied Physics, Measurements and Instruments, Computer and Information, Other
   	Experimental and theoretical studies of unstable nuclei and superheavy elements will be prompted. The research topics include nucler structure, nuclear reaction, and nuclear fission for nuclei far from the stable isotopes. In experimental programs, JAEA facilities and/or external facilities will be used to produce exotic nuclei. In theorey subjects nuclear structure and fission process will be studied by taking advantage of the JAEA supercomputer. (http://asrc.jaea.go.jp/soshiki/gr/HENS-gr/index_e.html)
   J14	Nuclear Chemistry of superheavy elements
   	Advanced Science Research Center	Sector of Nuclear Science Research	Nuclear Science Research Institute	Kazuaki Tsukada Tel: +81-29-282-5491 E-mail: tsukada.kazuaki@jaea.go.jp	Radiation Worker	Chemistry, Physics, Radiation, Measurements and Instruments, Applied Chemistry
   	The main objective is to understand chemical and atomic properties of superheavy elements (SHEs) placed at the uppermost end of the Periodic Table. This theme will focus on the valence electronic structure of SHEs from the measurements of ionization-energy, electron spin, surface adsorption, ionic radii, redox potentials, and molecular formations. The subjects include development of the measuring system based on an "atom-at-a-time" method. These experiments will be performed at the JAEA Tandem Accelerator Facility. (http://asrc.jaea.go.jp/soshiki/gr/HENS-gr/nc/index-e.htm)
   J15	Theoretical or Experimental Research for Hadron and Nuclear Physics at J-PARC
   	Advanced Science Research Center	Research Group for Hadron and Nuclear Physics	Nuclear Science Research Institute	Hiroyuki　Sako Tel: +81-29-284-3828 E-mail: sako.hiroyuki@jaea.go.jp	Radiation Worker	Physics
   	The successful candidate will work on either theoretical or experimental research of hadron and nuclear physics at J-PARC. The theoretical research includes hadron and nuclear physics related to J-PARC, and promotion of international theoretical research activities. The experimental research includes R&D of a fast DAQ system and detectors for J-PARC Heavy-Ion Program, and experimental studies with the kaon beamlines or the high-momentum beamline at J-PARC, RHIC, LHC, or KEKB.
   J16	Materials physics in heavy element systems
   	Advanced Science Research Center	Research group for Materials physics for heavy element systems	Nuclear Science Research Institute	Shinsaku KAMBE Tel: +81-29-284-3525 E-mail: kambe.shinsaku@jaea.go.jp	Non-Radiation Worker	Physics, Chemistry, Applied Physics, Material
   	New electronic states in heavy element systems are investigated experimentally and theoretically. Especially magnetic and superconducting properties at low temperatures in bulk and thin film samples are focused.
   J17	Theoretical study on spin-energy transformation materials
   	Advanced Science Research Center	Research Group for Spin-energy Transformation Science	Nuclear Science Research Institute	Michiyasu　Mori Tel: +81-29-284-3508 E-mail: mori.michiyasu@jaea.go.jp	Non-Radiation Worker	Physics
   	A sucessful candidate will theoretically study spin- and thermal-transport properties using some numerical techniques such as density functional theory, density matrix renormalization group method, quantum Monte Carlo method and so on. Thermoelectric materials, primarily related to spin Seebeck effect, and radiation-proof devices will be also important subjects of candidate.
   J18	Experimental study on spin-energy transformation materials
   	Advanced Science Research Center	Research Group for Spin-energy Transformation Science	Nuclear Science Research Institute	Michiyasu　Mori Tel: +81-29-284-3508 E-mail: mori.michiyasu@jaea.go.jp	Non-Radiation Worker	Physics
   	The theme is the experimental study on spintronics based on a noble cocept of spin current generation / manipuration using mechanical motion and nuclear spin. We approach the phenomenon that originate in the interaction of nuclear spin and mechanical motion using spectroscopy methods including Nuclear Magnetic Resonance. Our goal is to esablish a experimental method of the noble cocept of spin current generation / manipuration decrived above.
   J19	Interdisciplinary study on emergent properties of nanoscale structures by using advanced beams
   	Advanced Science Research Center	Research Group for Nanoscale Structure and Function of Advanced Materials	Nuclear Science Research Institute	Shin-ichi Shamoto Tel: +81-29-284-3521 E-mail: shamoto.shinichi@jaea.go.jp	Radiation Worker	Physics, Chemistry, Material, Applied Physics, Applied Chemistry, Measurements and Instruments
   	Structures and physical properties of materials from single-layer to bulk will be studied by using the advanced beams (neutron, positron and muon) produced at accelerator and reactor based facilities such as J-PARC. Those experiences are not required but high motivation for the researches are preferred.
   J22	Study on Accurate Nuclear Data Measurement
   	Nuclear Science and Engineering Center	Nuclear Data Center	Nuclear Science Research Institute	Atsushi Kimura Tel: +81-29-282-5796 E-mail: kimura.atsushi04@jaea.go.jp	Radiation Worker	Physics, Measurements and Instruments, Radiation
   	Accurate neutron cross sections for minor actinides (MAs) and long-lived fission products (LLFPs) are required for development of nuclear transmutation system. However, there are large gaps between current uncertainties and required uncertainties on these nuclear data. In order to decrease the uncertainties of the cross sections, we are carrying out neutron-TOF experiments using the high intensity pulsed neutron source at J-PARC. Since the increase of the neutron flux is in progress, it is essential to develop technologies related to data acquisition and data analysis especially designed for high count rate due to high neutron flux. In this theme, the assigned post doc fellow is requested to develop a fast data acquisition system and/or analysis methods (e.g. background evaluation due to scattering neutrons) in order to improve the accuracy of the nuclear data for MAs and LLFPs in wide neutron energy range. （http://wwwndc.jaea.go.jp/Labo/）
   J24	Fission product behavior in the Primary Containment Vessel of Light Water Reactor
   	Nuclear Science and Engineering Center	Development Group for LWR Advanced Technology	Nuclear Science Research Institute	Masahiko Osaka Tel: +81-29-282-5922 E-mail: ohsaka.masahiko@jaea.go.jp	Radiation Worker	Chemistry, Physics, Material, Chemical Engineering, Measurements and Instruments
   	Fission product (FP) behavior in the Primary Containment Vessel (PCV) of Light Water Reactor (LWR) should be known for the estimation of FP amounts released into environment (source term estimation) in the case of severe accident. Simulant FP aerosol behavior is directly viewed and deposited aerosol is characterized by experiments in a small-sized model PCV. Results are analyzed by thermal-hydraulic and chemical analysis codes to interpret the aerosol behavior in PCV. Complementary experiment/analysis on the FP aerosol formation and deposit revaporization/resuspention behaviors would be conducted, for the comprehensive understanding of FP behavior in the PCV under various conditions of such as hydraulics, moisture content, surface status and so on. The research is conducted in collaboration with researchers in the group.
   J27	Development of new separation reagents for radioactive nuclides based on the coodination chemistry of the transition metal complexes
   	Nuclear Science and Engineering Center	Research Group for Radiochemistry	Nuclear Science Research Institute	Masayuki Watanabe Tel: +81-29-282-5167 E-mail: watanabe.masayuki@jaea.go.jp	Radiation Worker	Chemistry, Physics, Geo and Environemtal Sciences
   	Radioactive wastes resulting from spent nuclear fuel contain numerous d-block or f-block transition metals such as platinum group or rare earths metals, as fission products. In this project, the coordination chemistry and physical properties of d-block and f-block elements are identified by various types of spectroscopy in order to develop effective separation reagents for these transition metal cations. The applicant should have profound scholarly knowledge about the redox reaction and complexation of the metal cations in radioactive wastes.
   J28	Electronic structure research of actinide and the related materials with synchrotron radiation X-ray spectroscopy
   	Materials Sciences Research Center	Electronic Structure Research Group	Energy and Environment Materials Science Division	Hiroshi Yamagami Tel: +81-791-58-2607 E-mail: yamagami@cc.kyoto-su.ac.jp	Radiation Worker	Physics, Applied Physics, Material, Measurements and Instruments
   	Our group is carrying out a research on electronic structure by synchotron radiation X-ray spectroscopies (soft x-ray angular-resolved photoemission, soft x-ray magnetic circular dichroism, and hard x-ray photoemission) at SPring-8 in order to elucidate a mechanism holding physical properties of actinides and the related materials including uranium compounds. Furthermore, we are engaged on Fukushima environmental recovery research and reactor decommissioning research. For going ahead with the above-mentioned research, our group will hope a researcher who can take part in a technical development on x-ray spectroscopy at beam lines of synchrotron radiation facility.
   J29	Research for controlling chemical reaction by laser
   	Materials Sciences Research Center	Actinide Chemistry Group	Energy and Environment Materials Science Division	Keiichi Yokoyama Tel: +81-791-58-0971 E-mail: yokoyama.keiichi@jaea.go.jp	Radiation Worker	Physics, Chemistry, Applied Physics
   	Fundamental studies to explore controllability of valence states of metal ions in solution are to be conducted using ultrafast lasers, aiming at developing new schemes in the nuclear fuel reprocessing. With respect to the f-electron elements such as lanthanides, through monitoring their valency after multi-photon excitations mediated by f-f transitions, you are expected to integrate the fundamental knowledge relevant to photo-induced element-selective valence control techniques. Development and application of ultrafast lasers and some spectroscopic techniques are to be included.
   J30	In situ studies of metallic materials using time-of-flight neutron diffraction
   	J-PARC Center	Materials and Life Science Directorate Neutron Science Section	J-PARC Center	Stefanus Harjo Tel: +81-29-284-3266 E-mail: stefanus.harjo@j-parc.jp	Radiation Worker	Material, Mechanics, Applied Physics, Physics, Measurements and Instruments
   	A high-resolution & high-intensity time-of-flight neutron diffractometer (TAKUMI) was constructed and now is operated for researches on various engineering materials at the Material & Life Science Experimental Facility of J-PARC. In this theme, the following studies using TAKUMI for the advanced steels and advanced light metals are planned. (1) The relationship between the microstructure evolution during deformation and the mechanical & functional properties, (2) the relationship between microstructural evolution during thermo-mechanical treatment and the mechanical properties, and (3) development of in situ hybrid neutron diffraction measurement technique (concurrent measurements of digital image correlation method and infrared thermography) for various deformation tests. Supporting researches at TAKUMI are also required.
   J31	Study of Performance Improvement for the J-PARC linac
   	J-PARC Center	Accelerator Division	J-PARC Center	Hidetomo　Oguri Tel: +81-29-284-3132 E-mail: oguri.hidetomo@jaea.go.jp	Radiation Worker	Physics, Applied Physics, Radiation, Electricity and Electronics, Measurements and Instruments
   	The goal of the J-PARC proton accelerators is to achieve stable beam operation at 1 MW. The linac is a beam injector for the J-PARC accelerator. Beam loss reduction is crucial to increase beam power and to achieve stable operation. And also, long-lasting component and failure prediction diagnosis are important for reliable operation. The subject of this theme is to study of performance improvement for the J-PARC linac. He/she will perform a study of beam loss reduction theoretically or experimentally, or a development of long-lasting component or failure prediction diagnosis for stabler operation of the linac.
   J33	Development of scanning neutron microscope system
   	J-PARC Center	Technology Development Section	J-PARC Center	Kazuya　Aizawa Tel: +81-29-284-3703 E-mail: aizawa.kazuya@jaea.go.jp	Radiation Worker	Measurements and Instruments, Radiation, Electricity and Electronics, Applied Physics, Physics
   	The employee will develop a neutron detector by new detection principle with fast readout and super-high spatial resolution based on superconducting detector in Materials and Life Science Experimental Facility at J-PARC. The goals of the theme are an establishment of an energy-dispersive scanning neutron-microscope system and its application to materials and life science research.
   J34	Development of a He-3 neutron spin filter and promotion of research using pulsed polarized neutrons.
   	J-PARC Center	Technology Development Section	J-PARC Center	Takayuki Oku Tel: +81-29-284-3196 E-mail: takayuki.oku@j-parc.jp	Radiation Worker	Physics, Radiation, Material, Applied Physics, Measurements and Instruments
   	At J-PARC MLF, a He-3 neutron spin filter (NSF) based on spin-exchange optical pumping method has been developed for the efficient utilization of pulsed neutrons. The employee will improve the He-3 NSF performance and adapt it to various kinds of experiments at J-PARC MLF. The employee will also develop sample environment which is optimized for use of the He-3 NSF, and will promote research using pulsed polarized neutrons.
   J35	Research on advanced nuclear characterization method of accelerator driven transmutation system using J-PARC facility
   	J-PARC Center	Facility and Application Development Section	J-PARC Center	Shin-ichiro Meigo Tel: +81-29-284-3207 E-mail: meigo.shinichiro@jaea.go.jp	Radiation Worker	Physics, Radiation, Material
   	For R&D to reduce of long-life radioactive waste with an accelerator-driven system (ADS), "ADS target test facility" is planned to be built as a part of nuclear transformation experiment facility (TEF) in J-PARC, which utilize spallation neutron produced at a lead-bismuth target irradiated with a 400-MeV proton beam. In this theme, basic nuclear data such as hydrogen and helium generation and DPA cross-sections will be measured by using J-PARC accelerator. The obtained data will be compared with model calculation such as a nucleon and meson transport calculation code (PHITS) to improve the nuclear reaction model, which is aimed to contribute to the optimization of the neutronics of the ADS. R&D on the partitioning and transmutation technology: http://snsr.jaea.go.jp/en/topics/pt.html"
   J37	Study of aging deterioration mechanism and preservation technology by using the material of Fugen NPP
   	Fugen Decomissionning Engineering Center	Plant Material Examination Section	Tsuruga headquarters	Yoshiaki Katano Tel: +81-770-26-1221 E-mail: katano.yoshiaki@jaea.go.jp	Radiation Worker	Material, Measurements and Instruments, Physics, Chemistry, Chemical Engineering, Computer and Information
   	The operation period of a nuclear power plant is limited to 40 years by law in Japan. The Nuclear Regulation Authority (NRA) can extend the period by 20 years more when the plant passed the review of the NRA. By using the real used material of the “Fugen” NPP after 25 years operation, the research of the deterioration and preservation mechanism is carried out for the long-term integrity of nuclear facilities. The main study programs are aging mechanism related to embrittlement by corrosion, thermal and radiation characteristics, by using data obtained from the three-dimensional atom probe (3DAP), the electron beam backscattering diffraction (EBSD) and focused ion beam scanning electron microscope (FIB-SEM) in the laboratory of the Fugen site. Moreover, the study of mechanism theory is implemented by simulation technology of the microscopic stress analysis by ABAQUS and phase field method. In this way, it will contribute to the long-term integrity of the nuclear power plant, by investigating the aging deterioration mechanism and improving the preservation technology.
   J38	Study on methodogies for modelling and analysis of geological environment
   	Horonobe Underground Research Center	Sedimentary Environment Research Group	Horonobe Underground Research Center	Toshinori SATO Tel: +81-1632-5-2022 E-mail: sato.toshinori@jaea.go.jp	Non-Radiation Worker	Physics, Geo and Environemtal Sciences, Architectural and Civil Engineering, Measurements and Instruments
   	The Horonobe Underground Research Laboratory (URL) Project is being pursued to enhance the reliability of relevant disposal technologies through investigations of the deep geological environment within the host sedimentary formations at Horonobe, northern Hokkaido. The project consists of two major research areas, geoscientific research and R&D on geological disposal. One of theses, study on methodogies for modelling and analysis of geological environment, such as, geology, groundwater flow, geochemistry for long period have been performed. Modelling study for excavation disturbed zone and permeability of faults based on the results of in-situ and laboratory test also have been developed. （）
   J41	Ra which exists in the mineral Study about the physico-chemistry-like special quality of the isotope
   	Ningyo-toge environmental engineering center	Environmental engineering Material R&D Division	Ningyo-toge Environmental Engineering Center	Yoshiyuki　Ohara Tel: +81-868-44-2211 E-mail: ohara,yoshiyuki@jaea.go.jp	Non-Radiation Worker	Physics, Geo and Environemtal Sciences, Measurements and Instruments
   	We are working on environmental restoration business of uranium mine which had ended mine activity at Ningyo-toge Environmental Engineering Center at present. It’s a very important problem for safe and efficient environmental restoration business to make clear the factor which ruled behavior of radioactive materials in the water conservation area in Ningyo-toge basin. Minerals containing naturally occurring uranium and thorium have isotopes of radium produced as progeny nuclides within their decay series. Isotopes of radium present in minerals are considered to have different physicochemical properties, reflecting the history (such as the mode of disintegration and the number of disintegration etc.) until they are produced. Therefore, in this study, by investigating the existence state of radium isotope in minerals, it contributes to making clear of the difference in elution behavior between radium isotopes. Also, a research of the difference in the existence state of radium isotopes between different kinds of minerals gives important knowledge when choosing matrix of solidified body of radioactive waste, and is important for promoting uranium mine environmental restoration project.
   F8	Development of volume reduction of Cs-contaminated soil and elucidation of Cs sorption-desorption mechanism.
   	Materials Sciences Research Center	Actinide Chemistry Group	Energy and Environment Materials Science Division	Hideaki Shiwaku Tel: +81-791-58-2615 E-mail: shiwaku@spring8.or.jp	Radiation Worker	Chemistry, Physics, Geo and Environemtal Sciences, Chemical Engineering, Measurements and Instruments
   	Radioactive cesium (Cs-134 and Cs-137) released to environment by the accident of TEPCO Fukushima Daiichi Nuclear Power Plant. Radioactive cesium was taken into soil in the environment after the accident immediately and produced enormous contaminated soil. Contaminated soil is planned to be exported outside Fukushima after 30 years. Therefore, the development study of the volume reduction of this contaminated soil is very important from the viewpoint of economic efficiency, environmental impact, radiation exposure, etc. In this study, structural analysis will be performed using synchrotron radiation (SPring-8) on the elucidation of radioactive cesium adsorption mechanism for farmland soil, including many clay minerals such as weathered biotite. We will contribute to environmental recovery of Fukushima.
   F9	Research on cesium removal from contaminated soils and selective formation of the product by heat treatment
   	Materials Sciences Research Center	Analytical Sciences Development Research Group	Nuclear Science Research Institute	Mitsunori Honda Tel: +81-29-284-3928 E-mail: honda.mitsunori@jaea.go.jp	Radiation Worker	Geo and Environemtal Sciences, Radiation, Physics, Chemistry, Material
   	Decontamination of a large quantity of radioactive cesium (Cs) released with The Fukushima Daiichi Nuclear Power Plant Accident is an urgent problem that should be solved. However, the decontamination method of the radioactive contamination soil is not established yet. We study Cs desorption mechanism of clay minerals to develop Cs-free mineralization for volume reduction and reuse of the treated soil in Fukushima. Weathered biotite (WB) is adopted as a model soil to sorb non-radioactive Cs. WB is heated with some alkaline salt reagents in ambient atmosphere or low-pressure conditions and the products formed after the heating treatment are analyzed using X-ray diffraction, X-ray fluorescence and X-ray absorption spectroscopy techniques. We focus on the dependences of reagents and pressure on Cs desorption ratio and structural change of WB.