A5075082001- Nuclear Physics and Applications
- Advanced Radiotherapy Techniques
- Radiation Therapy and Dosimetry
- Medical Imaging Techniques and Applications
- Radiation Dose and Imaging
- Advanced X-ray and CT Imaging
- Radiation Effects and Dosimetry
- Spaceflight effects on biology
- Nuclear reactor physics and engineering
- Advanced MRI Techniques and Applications
- Planetary Science and Exploration
- Radiation Detection and Scintillator Technologies
- Molecular Biology Techniques and Applications
- Effects of Radiation Exposure
- Geophysics and Gravity Measurements
- Magnetic confinement fusion research
- Biochemical effects in animals
- Educational Robotics and Engineering
- Spacecraft and Cryogenic Technologies
- Fusion materials and technologies
- Atomic and Subatomic Physics Research
- Advanced X-ray Imaging Techniques
- Superconducting Materials and Applications
- Radiomics and Machine Learning in Medical Imaging
- High-pressure geophysics and materials
RIKEN Center for Advanced Photonics
2017-2023
RIKEN
2019-2022
Utsunomiya University
2022
High Energy Accelerator Research Organization
2022
Ibaraki National College of Technology
2022
National Institute of Technology, Nagano College
2022
Nagaoka University
2022
National Institute of Technology, Kagoshima College
2022
Hitachi (Japan)
2022
Ibaraki Prefectural University of Health Sciences
2017
Abstract The impact of deep space cosmic rays on food resources is as important the risks to human body. This study demonstrates potential for neutrons secondary radiation in spacecraft cause meat activation and oxidative modification proteins lipids. We conducted a series experiments such neutron irradiation experiment, radioactivation analysis biochemical analysis. Neutrons with energies from 1 5 MeV doses 0.01 Gy 4 were irradiated by RIKEN accelerated-driven source (RANS). Radioactive...
Abstract Rhodamine 6G (R6G) and 7-diethylamino-4-methylcoumarin (7D4MC) were applied to a nanoclay gel dosimeter based on radiation-induced degradation. The radiological properties evaluated under X-ray irradiation. fluorescent dyes showed linear degradation with an increase in dose. In addition, the distribution of fluorescence induced by inhomogeneous irradiation was maintained for two months suppressed diffusion matrix observed.
A fast response calorimeter has been developed for the neutral-beam (NB) shine-through measurement. This following advantages. (1) Temporal variation of heat load onto can be measured. (2) Measurement under relatively high flux environment is possible. (3) The calorimetric measurement continuous and steady-state also verification principle was done using an NB-injection system on compact helical (CHS) at National Institute Fusion Science (NIFS). measured NB power densities are compared to...
With the international trend of lunar exploration including ARTTEMIS Plan, we are focusing on water resource and neutron lifetime measurement around Moon by radiation neutrons. We developing a monitor for neutrons gamma rays, Moisture Targeting Observatory (MoMoTarO), which is mounted rover or orbiter. The non-contact without excavation can be realized measuring difference in number thermal epi-thermal depending content. MoMoTarO also challenge gamma-ray bursts Moon. process laboratory model...
Absorbed dose–response characteristics of AQUAJOINT®-based polymer gel and PAGAT dosimeters were compared using Optical CT MRI. AQUAJOINT® exhibited a relatively good linear relationship in the radiation dose range 0–5 Gy.
Abstract We built a clear micelle gel dosimeter with nanoclay. Jordan et al. reported that Laponite RD clay nanoparticles when added to radiochromic leucomalachite green gels eliminate diffusion and increase the dose sensitivity by roughly ten folds. However, owing cloudiness of sample, there was problem in reading optical computed tomography (CT). In this study, we constructed nanoclay-added changing type gelatin. As result, addition yielding making CT readable, temporal stability were...
To characterize the dose rate distribution in an experimental hall of a RIKEN accelerator-driven compact neutron source (RANS) based on 9 Be(p, n) reaction with 7 MeV proton injection, systematical measurements and calculations for gamma-ray rates by GEometry ANd Tracking (GEANT), Particle Heavy Ion Transport code System (PHITS), Monte Carlo N-Particle (MCNP) codes were performed.Calculations always underestimated when beam loss effect was not considered.Relatively good agreements observed...
One of the major challenges in deep space exploration are effects cosmic rays on human body and soft error, but equally important their food resources. In this study, we focused neutrons as secondary particle environment investigated how they affect Fast neutron was irradiated by RIKEN Accelerator-driven compact Neutron Source (RANS) meat sample. Biochemical analysis conducted to present concrete environment. Oxidative nitrative modifications proteins were detected electrophoresis Western...
Polymer gels are three-dimensional dosimetric tools. The purpose of the present study was to investigate temperature dependence polymer during scanning Magnetic Resonance Imaging. Prepared were irradiated with a 6MV X-ray beam at intensities ranging from 0 20 Gy in order their dose-R2 and dose-R1 responses. Irradiated evaluated 1.5-T magnetic resonance R2 R1 images for each 5°C change 41°C, then four-field box technique irradiation plan used deliver total dose 4 using same weight direction...
When a radiochromic micelle gel dosimeter is employed for optical computed tomography (CT) measurement, cupping (or dishing) artifacts appear at areas irradiated with high dose. Anti-scatter polarizer correction to remove scatter signals from CT data, but remains. Here, measurement conditions reducing are investigated. A change in observation wavelength found suppress the influence. Measurements involving aqueous dye solutions varying jar sizes and concentrations reveal artifact behavior...
This article describes an optical computed tomography (OCT) for polymer gel dosimetry, focusing on two systems recently constructed by us. The first OCT system, which is categorized as a first-generation comprised single He-Ne laser, photodiode, and mechanical stages moving turning dosimeter. Projection data per angle are acquired from turned In this the reconstructed image obtained using filtered back-projection (FBP) method projection data. second system 2D-OCT scanner that utilizes light...
The RANS (RIKEN Accelerator driven Neutron Source), one of compact accelerator neutron sources (CANS), tries to expand its performance by installing a cold which may provide new opportunities in many applications. is low power CANS with proton beam 7 MeV and 100 µA at maximum. A moderator system was constructed based on results optimization design study mesitylene. Recently, we have done tests aiming showing characteristics as source. Cryogenic mesitylene installed plug target reflector...
理化学研究所では，産業利用の現場における評価解析装置システムとして，さらに社会インフラを検査する屋外利用可能な可搬型計測システムとして広く利用されることを目標とし，小型中性子源システムRANS, RANS-II, RANS-III, RANS-µを開発している。多様なニーズに的確に対応するため，中性子源をさらに小型化，軽量化しながらも，中性子線の高い透過能と分解能を活かした高度な計測が実現しつつある。
Concrete structure has been widely used in bridges and highways, however, its performance will be deteriorated after long term serving or suffering disaster. Since fast neutron strong transmission ability is sensitive to water content the concrete structure, it can provide an effective probe inspect inner of with non-destructive way. Thus, we propose a imaging reconstruction system 3D CT for inspection Riken accelerator-driven compact source (RANS) using pixel-type detector, which 8×8...
Neutron imaging based on a compact Talbot–Lau interferometer was demonstrated using the RIKEN accelerator-driven neutron source (RANS). A consisting of gadolinium absorption gratings and silicon phase grating constructed connected to RANS. Because pulsed thermal neutrons from RANS position-sensitive detector equipped with time-of-flight (TOF) analysis, moiré interference patterns generated were extracted at TOF range around design wavelength (2.37 Å) optimal for interferometer. Differential...
A sample-motion-synchronized neutron stroboscope is developed using the RIKEN accelerator-based compact source (RANS). When a sample reaches specified rotation phase, phase timing signal generated, triggering proton pulse at accelerator. exposes imaging detector through sample. By controlling delay time between and timing, exposure always synchronized with specific phase. rotating speed of 1800 RPM prepared, clear still images neutrons are taken.
High Energy Accelerator Research Organization (KEK) launched an education project for the fabrication of accelerator named "AxeLatoon" in 2020 together with National Institute Technology (KOSEN). This aims to improve engineering skills students and foster next generation researchers by providing hands-on training field science. In first year, we collaborated NIT (KOSEN), Ibaraki College build accelerator. Students took initiative this extracurricular activity challenged building From 2021,...