A5084765813- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Nuclear Materials and Properties
- Radiation Detection and Scintillator Technologies
- Laser-induced spectroscopy and plasma
- Radioactive contamination and transfer
- Mass Spectrometry Techniques and Applications
- Photonic and Optical Devices
- Neutrino Physics Research
- Isotope Analysis in Ecology
- Laser Design and Applications
- Semiconductor Lasers and Optical Devices
- Fusion materials and technologies
- Ion-surface interactions and analysis
- Astrophysics and Cosmic Phenomena
- Graphite, nuclear technology, radiation studies
- Atomic and Subatomic Physics Research
- Engineering Applied Research
- Advanced X-ray and CT Imaging
- Nuclear and radioactivity studies
- Optical Systems and Laser Technology
- Antibiotic Use and Resistance
- Nuclear Engineering Thermal-Hydraulics
- Pneumonia and Respiratory Infections
- Astrophysical Phenomena and Observations
Japan Atomic Energy Agency
2012-2023
Federico Santa María Technical University
2023
The University of Tokyo
2020
Institute for Laser Technology
2020
National Institute of Advanced Industrial Science and Technology
2003-2011
University of Fukui
2011
Kyoto Institute of Technology
2007-2010
Nagoya University
2002-2009
Kyushu University
2002
Niigata University
1999
To inspect the post-accident nuclear core reactor of TEPCO Fukushima Daiichi power plant (F1-NPP), a transportable fiber-coupled laser-induced breakdown spectroscopy (LIBS) instrument has been developed. The developed LIBS was designed to analyze underwater samples in high-radiation field by single-pulse with gas flow or double-pulse breakdown. check feasibility assembled for analysis debris material (mixture fuel core, cladding, construction and so on) F1-NPP, we investigated influence...
We observed three γ-ray bursts related to thunderclouds in winter using the prototype of anti-neutrino detector PANDA made 360-kg plastic scintillator deployed at Ohi Power Station coastal area Japan Sea. The maximum rate events which deposited energy higher than 3 MeV was (5.5±0.1)×102/s. Monte Carlo simulation showed that electrons with approximately monochromatic falling downwards from altitudes order 100 m roughly produced total spectra bursts. It is supposed secondary cosmic-ray...
In the Fukushima Daiichi Nuclear Power Station, it is necessary to survey locations and conditions of fuel debris inside reactor pressure vessels or primary containment under water radiation environment in preparation for removing debris. An optical fiber well known features such as signal transmission, light weight, superior insulation performance, resistance electromagnetic noise resistance. These allow simplify instrumentation systems in-vessel inspection, long provide that can be used...
ABSTRACT SDSS-V is carrying out a dedicated survey for white dwarfs, single, and in binaries, we report the analysis of spectroscopy 118 cataclysmic variables (CVs) CV candidates obtained during final plug plate observations SDSS. We identify eight new CVs, spectroscopically confirm 53 refute 11 published candidates, 21 or improved orbital periods. The period distribution CVs does not clearly exhibit gap. In common with previous studies, shows that identified have larger proportion...
A newly designed piezoelectrically driven XYθ table has been developed for submicron lithography systems. The was fabricated using a monolithic plate structure, joined together with flexure hinges and by an inchworm function. This function involves the periodic clamping unclamping of four blocks expansion contraction piezoelectric actuators. can travel long distance fine positioning in X, Y, θ directions. velocities be controlled up to 0.5 mm/s X Y directions, 0.3×10 −2 rad/s direction...
The present study presents the Hiroshima University Registry of atomic bomb survivors, which total number is about 270,000, and application absorbed doses. From this registry, we picked up 49,102 survivors applied organ doses based on dosimetry system 1986 (DS86), named Atomic Bomb Survivor 1993 Dose (ABS93D). dose data are tables listed in DS86 final report such as free-in-air kermas, house shielding factors, factors for active bone marrow breast. Calculations 13 other organs provided...
Superconducting Transition edge sensor (TES) coupled with a heavy metal absorber is promising microcalorimeter for Gamma-ray (γ-ray) spectroscopy ultra-high energy resolution and high detection efficiency. It very useful the non-destructed inspection of nuclide materials. High resolving power γ-ray peaks can precisely identify multiple nuclides such as Plutonium (Pu) Actinides efficiency safety. For this purpose, we have developed TES tin absorber. We suggest new device structure using gold...
To prevent a fuel failure event from becoming serious radiation accident, sodium-cooled fast reactors are equipped with system for failed detection and location (FFDL). The FFDL instrument employed in the prototype breeder reactor Monju is based on gas tagging method, which precise accurate measurements of krypton xenon isotope ratios (78Kr/80Kr, 82Kr/80Kr 126Xe/129Xe) must be performed short time. Burnup also contribute to determination 82Kr/80Kr. We have developed highly sensitive...
A wavelength-division-multiplexing (WDM) optical interconnect board providing broad-band transmission from a two-dimensional (2D) array of vertical-cavity surface-emitting lasers (VCSELs) to 2D photodetectors is one the attractive candidates for constructing future ultrahigh performance signal processing systems. Focusing grating couplers and distributed Bragg reflectors were integrated into thin-film glass waveguide form free-space-wave add/drop multi/demultiplexers required WDM board....
Isotopic analysis of krypton (Kr) and xenon (Xe) by resonance ionization mass spectrometry (RIMS) is an effective tool for identification failed fuel in fast reactors to achieve their safety operation high plant availability. Reliability the detection location (FFDL) system depends on precise determination 78Kr/80Kr, 82Kr/80Kr 126Xe/129Xe isotopic ratios, which mainly hampered statistical errors corresponding isotopes except 82Kr generated large amounts during reactors. In this paper, we...
A high-radiation resistant optical fiber has been developed in order to investigate the interiors of reactor pressure vessels and primary containment Fukushima Daiichi Nuclear Power Station. The radiation resistance an was improved by increasing amount hydroxyl up 1000 ppm pure silica fiber. We have tried apply for remote imaging technique means fiberscope. image consists common cladding a large number cores made from that contains hydroxyl. transmissive rate infrared not affected after...
An in-pile creep rupture experiment was conducted in the experimental fast reactor Joyo to evaluate strength of oxide dispersion strengthened (ODS) ferritic steel under neutron irradiation. ODS has been developed as a most promising fuel cladding material for next generation because its high temperature resistance and low swelling properties. The irradiation test device MAterial testing RIg with COntrol (MARICO) control precision ±4°C. Twenty four specimens no were pressurized by helium gas...
We have proposed an advanced technique to measure the 93mNb yield precisely by Resonance Ionization Mass Spectrometry, instead of conventional characteristic X-ray spectroscopy. 93mNb-selective resonance ionization is achievable distinguishing hyperfine splitting atomic energy levels between 93Nb and at high resolution. In advance detection, we could successfully demonstrate resolution resonant spectroscopy stable using all solid-state, narrow-band tunable Ti:Sapphire laser system operated 1...