A5103367992- Nuclear Physics and Applications
- Radiation Therapy and Dosimetry
- Radiation Detection and Scintillator Technologies
- Boron Compounds in Chemistry
- Radiation Effects and Dosimetry
- Superconducting Materials and Applications
- Advanced Radiotherapy Techniques
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Radiation Dose and Imaging
- Medical Imaging Techniques and Applications
- Radioactivity and Radon Measurements
- Facility Location and Emergency Management
- Plasma Diagnostics and Applications
- Radioactive contamination and transfer
- Radiation Shielding Materials Analysis
- Nuclear reactor physics and engineering
- Advanced X-ray and CT Imaging
- Vehicle Routing Optimization Methods
- Immunotherapy and Immune Responses
- Nuclear and radioactivity studies
- Manufacturing Process and Optimization
- Evacuation and Crowd Dynamics
- Virus-based gene therapy research
- Transportation Planning and Optimization
Hiroshima University
2010-2024
Kyoto Pharmaceutical University
2023-2024
High Energy Accelerator Research Organization
1994-2020
Mitsubishi Electric (United States)
2018
Sapporo Medical University
2009-2015
Nagaoka University
2014
Nagaoka University of Technology
2014
University of Electro-Communications
2009-2013
Physikalisch-Technische Bundesanstalt
2012
Tokyo University of Science
2006-2008
Growth processes of clusters in low-pressure and low-power silane radio frequency discharges are studied by using the newly developed double-pulse-discharge method which realizes situ measurement their size density a range 0.5–4 nm. The begin to be composed two groups at about 10 ms after discharge initiation: small group have an almost constant average 0.5 nm through period, while those large one grow 4 nm/s monodisperse way. Time evolution measured sizes densities is transformed into that...
The method of electron paramagnetic resonance (EPR) dosimetry was applied to the enamel teeth extracted from residents Dolon and Bodene settlements Beskaragay district, which is area adjacent radioactive fallout most contaminating nuclear test 1949. individual accidental radiation doses due were obtained amplitude induced EPR signal CO2- radical using calibration method, after determining parameters measurements obtain best reproducibility intensities. It shown that subtracting natural...
The method of electron paramagnetic resonance (EPR) spectroscopy for tooth enamel is applied to individual radiation dose determination residents two villages (Dolon and Mostik) in the vicinity Semipalatinsk nuclear test site Kazakhstan. These are located near central axis radioactive fallout trace most contaminating surface conducted 1949. It found that excess doses obtained by subtraction natural background from absorbed range up 440 mGy Dolon, whose was formed before 1949, do not exceed...
The major histocompatibility complex class I genes play an essential role in the immune presentation of aberrant cells. To gain further insight into regulation expression these and to better define functions their protein products, we made use technique gene transfer germ line inbred mice. With locus-specific DNA probes, observed that a transgenic was expressed tissue-dependent fashion analogous endogenous gene. In addition, level substantially higher availability mice properly expressing...
In this study, the authors evaluated accuracy of dose calculations performed by convolution/superposition based anisotropic analytical algorithm (AAA) in lung equivalent heterogeneities with and without bone heterogeneities.Calculations PDDs using AAA Monte Carlo simulations (MCNP4C) were compared to ionization chamber measurements a heterogeneous phantom consisting materials. Both 6 10 MV photon beams 4 x cm(2) field sizes used for simulations. Furthermore, changes energy spectrum depth...
A calculation method for the dosage of neutrons by near-threshold 7Li(p, n)7Be and gamma rays p'gamma)7Li was validated through experiments with variable distance between Li target phantom, focusing on large angular dependence. The production in calculated Lee's their transport phantom using MCNP-4B code. intra-operative boron neutron capture therapy (BNCT) direct evaluated method. effectiveness usage confirmed from existence region satisfying requirements protocol utilized BNCT brain...
In order to improve the accuracy of tooth enamel EPR dosimetry method, spectra recording conditions were optimized. The uncertainty dose determination was obtained as mean square deviation doses, determined with use a deconvolution program, from nominal doses for ten samples irradiated in range 0 500 mGy. recorded at different microwave powers and accumulation times. It shown that minimal is achieved power about 2 mW used spectrometer JEOL JES-FA100. found limit time exists beyond which...
Spatial distributions of soil contamination by 137Cs (89 sampling points) and 239+240Pu (76 near within Dolon village were analyzed. An essential exponential decrease was found in village: the distance a half reduction is about 0.87-1.25 km (in northwest-southeast direction from supposed centerline radioactive trace). This fact agreement with available exposure rate measurements (September 1949 archive data): on basis few pattern trace estimated to comprise narrow 2 corridor maximum rate. To...
Microdosimetric single event spectra as a function of depth in phantom for the 290 MeV/nucleon therapeutic carbon beam at HIMAC were measured by using tissue equivalent proportional counter (TEPC). Two types geometries used: one is fragment particle identification measurement (PID-mode) with time flight (TOF) method without backward phantom, and other an in-phantom (IPM-mode) phantom.
Downward migration of 137Cs in soils was studied three mixed deciduous forests c.a. 40 km northwest the Fukushima Daiichi Nuclear power plant (FDNPP), Japan. We selected different types forest regarding to environmental condition such as slope inclinations and snow coverage conditions at time deposition. examined temporal changes vertical distribution from litter layers 10 cm soil depth for two years (2.3 4.3 after FDNPP accident 2011). At all study sites, layer had largely migrated surface...
Abstract Background Boron neutron capture therapy (BNCT) is a next‐generation radiotherapy, utilizing both an external beam and ‐containing pharmaceutical. A compact accelerator for high intensity source was installed to conduct BNCT in hospital. The dose administered patient evaluated by measuring the proton current. Purpose Neutron should be monitored real‐time neutrons emitted from target during irradiation. This crucial due potential degradation. Online monitoring systems are required...
The purpose of this study was to estimate the internal dose radiation in Japanese macaques (aka Nihonzaru or snow monkey) due Fukushima nuclear power plant accident. Images a male macaque weighing ~10 kg were acquired using multi-slice computed tomography (CT) scan with 64-row segment detector. CT images used create voxel phantoms bones, bone marrow, brain, eyes, heart, lungs, stomach, liver, spleen, pancreas, kidneys, intestines, bladder, testes, thyroid and miscellaneous tissue. Particle...
The regulated expression of major histocompatibility complex class I antigens is essential for assuring proper cellular immune responses. To study H-2 gene regulation, we have transferred a foreign to inbred mice and previously shown that the heterologous was expressed in tissue-dependent manner. In this report, demonstrate these transgenic molecule on cell surface without any alteration level endogenous antigens. Skin grafts from were rapidly rejected by background strain, indicating...
The effects of solar radiation on the ESR signals in human tooth enamel were investigated. Enamel samples exposed to sunlight Hiroshima, Japan, sunny days for a total about 228 hours over one year. intensity illuminating was measured with light meter, which then converted radiation. Three types caused by identified. signal named S1 is identical gamma ray radiation-induced axially symmetrical and contains two S1( perpendicular) S1(//) corresponding perpendicular parallel components g-tensor...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> Superconducting combined function magnets for the J-PARC (Japan Proton Accelerator Research Complex) neutrino experiment have been successfully developed at High Energy Organization, KEK. The first prototype magnet reassembled quench protection studies, and cold test result indicated that eight heaters are effective safe of magnet. Three production fabricated tested 4.5 K, 1 atm, in a vertical...
The large aperture superconducting beam separation dipole (D1) must be developed as part of the high luminosity upgrade Large Hadron Collider (HL-LHC) at CERN. most important specifications D1 are a coil 150 mm and field integral 35 T·m 12.0 kA 1.9 K. technical challenges this magnet include predicting changes in size coils during fabrication, achieving radiation resistance, management iron saturation. KEK is charge developing D1. After conducting series design studies, consisting...
The characteristics of moderator assembly dimension are investigated for the usage 7Li(p,n) neutrons by 2.5 MeV protons in boron newtron capture therapy (BNCT) brain tumors present study. indexes checked treatable protocol depth (TPD), which is greatest region satisfying dose requirements BNCT protocol, proton current necessary to complete 1 h irradiation, and heat flux deposited Li target should be removed. Assumed materials D2O moderator, mixture polyethylene LiF with 50 wt % collimator....