A5081303295- Nuclear Physics and Applications
- Graphite, nuclear technology, radiation studies
- Radiation Detection and Scintillator Technologies
- Radiation Therapy and Dosimetry
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Nuclear reactor physics and engineering
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Wireless Communication Networks Research
- Nuclear and radioactivity studies
- EEG and Brain-Computer Interfaces
- Hearing Loss and Rehabilitation
- Ear Surgery and Otitis Media
- ECG Monitoring and Analysis
- Advanced Wireless Communication Techniques
- Facial Nerve Paralysis Treatment and Research
- Non-Invasive Vital Sign Monitoring
- Heart Rate Variability and Autonomic Control
- Vagus Nerve Stimulation Research
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Advanced X-ray and CT Imaging
- Head and Neck Surgical Oncology
- IPv6, Mobility, Handover, Networks, Security
High Energy Accelerator Research Organization
2002-2024
Institute of Electrical and Electronics Engineers
2023
Japan Proton Accelerator Research Complex
2018-2021
Funabashi Municipal Medical Center
2021
Tokyo Denki University
2018-2020
Planta
2014
Kyoto Institute of Technology
2013
Kitano Hospital
2004
Osaka International Cancer Institute
2003
Osaka City University
1991-1998
In a nuclear power plant accident, radioactive nuclides may be released which are distributed uniformly on the ground. If estimation of dose rate from such source by Monte Carlo calculation is attempted, some difficulty encountered because efficiency very low. To solve this low problem, we show that plane isotropic can transformed into point changing detector shape unit sphere to plane. We verified validity transformation numerical comparison unscattered photon fluence. As an example...
A series of diamidine dihydrochlorides was prepared utilizing a spacer unit to control the distance between two amidinium groups. The introduction groups 1,8-position each (i.e., 9,10-dihydroanthracene, anthracene, biphenylene) can direction formation self-assembled structure. fine-tuning distances in units help stabilizing interactions carboxylic acid (intermolecular attraction) after four-component assembly (see ). Based on this concept, we succeeded box-like assembled structure using...
This paper proposes a novel analogue front end (AFE) that has three features: voltage-dependent input impedance, bandpass amplification, and stray capacitance reduction. With view to applying the AFE capacitive biopotential measurements (CBMs), features were investigated separately in schematic mathematical manner. Capacitive electrocardiogram (cECG) or electromyogram (cEMG) using performed low-humidity conditions (below 35% relative humidity) for total of seven human subjects. Performance...
Background: This study aimed to investigate the activation characteristics of concrete in synchrotron-type proton therapy facilities for future decommissioning.The larger synchrotrontype have a greater potential impact on decontamination than cyclotron investigated our previous study.Specific activity levels after 30 years operation were predicted from measured thermal neutron fluence rates during compare them with clearance level. Materials and Methods:The investigations conducted at...
Case Reports| September 04 2003 Spinal Dermal Sinus Associated with Intramedullary Abscess and Dermoid Subject Area: Neurology Neuroscience , Surgery Women's Children's Health Kazuyoshi Morimoto; Morimoto Osaka Medical Center Research Institute for Maternal Child Health, Izumi, Osaka, Japan Search other works by this author on: This Site PubMed Google Scholar Osamu Takemoto; Takemoto Hajime Nakamura; Nakamura Makoto Takeuchi Pediatr Neurosurg (2003) 39 (4): 225–226....
The number of positron emission tomography (PET) examinations has greatly increased world-wide. Since nuclides for the PET have short half-lives, they are mainly produced using on-site cyclotrons. During production nuclides, significant quantities neutrons generated from Neutrons potential to activate materials around cyclotrons and cause exposure staff. To investigate distribution thermal neutrons, neutron fluxes were measured a cyclotron in laboratory associating with hospital. accelerates...
Front-end amplifier for capacitive electrocardiogram (cECG) measurement requires high input impedance only in the corresponding frequency band. To achieve around ECG band, a bootstrapping technique was applied to non-inverting (NiA), then combined with stray capacitance canceller (SCC). Theoretical formulas were derived design band and skirt unfavorable resonances. Validities of confirmed respectively experiments using physical model. Bootstrapped NiA SCC suppressed attenuation most cECG measurement.
We recently reported the possibility of simultaneous measurement capacitive electrocardiogram (cEGC) and ballistocardiogram (cBCG) using non-contact coupling systems in bed. However, relations two measurements with blood pressure (BP) have not been elucidated cBCG were unstable. Therefore, this study, electrodes for cEGC excluded, concerning potential influence interference. Electrode size was changed to stabilize measurements. The Valsalva test (VT) performed on five subjects, correlations...
To establish a systematic guideline for accelerator decommissioning, as case study, beamline activation of 12 MeV-proton electrostatic was investigated employing survey meter and γ-ray spectrometers. Beam loss points where reflected high dose-rate area were identified, generated nuclides their activities determined. Almost components are made from stainless steel 52Mn 56Co detected principal induced activities. It found that the activity significantly contribute to dose rate value denoted on...
Journal Article Neutron Energy Response of a Modified Andersson-Braun REM Counter Get access J. Li, Li Search for other works by this author on: Oxford Academic PubMed Google Scholar Y. Tang, Tang S. Liu, Liu Ban, Ban T. Suzuki, Suzuki K. Iijima, Iijima H. Nakamura Radiation Protection Dosimetry, Volume 67, Issue 3, 1 September 1996, Pages 179–185, https://doi.org/10.1093/oxfordjournals.rpd.a031814 Published: 01 1996
We addressed design of bootstrapped voltage follower (BVF) in analytical approach from a perspective capacitive electrocardiogram (cECG) measurement. Theoretical formulas transfer function, resonant frequency and damping ratio for BVF were derived experimentally validated. The function beneficial predicting cutoff frequency-gain characteristics attenuation band the low-frequency region. was foreseeing occurrences resonance distortion cECG recording. Next challenge is to derive an index...
In order to evaluate the state of activation in a cyclotron facility used for radioisotope production PET diagnostics, we measured neutron flux by using gold foils and TLDs. Then, spatial distribution neutrons induced activity inside vault were simulated with Monte Calro calculation code transport DCHAIN-SP calculation. The calculated results are good agreement values within factor 3. Therefore, adaption advanced evaluation procedure level is proved be important planning decommissioning...
To manage the equivalent doses for radiation workers, exposure inhomogeneity is an important factor in decision-making process related to protection measures and additional monitoring. Our previous study proposed methodology evaluate of quantitatively. In this study, we applied method five different types actual situations encountered nuclear industry. Two them were conventionally characterized as homogeneous exposure, other three inhomogeneous exposure. The evaluation homogeneity was...
Cyclotrons of the self-shielding type have recently been employed for use in medical applications.Herein, we investigated shielding power five types self-shields by measuring neutron flux from inside to outside self-shield.Measurements were performed through activation Au foils, TLD, and dosimeter with CR-39 as track detector.During production 18 F, thermal near target box was found be 10 7 cm -2 •s -1 .The cyclotron vault 1-2 cyclotrons reduced flux, which became orders magnitude lower than...
The clinical usefulness of Tsumura-Saireito, which was judged by tympanoaudiometric tests, compared with that cepharanthin in 64 ears 42 children otitis media effusion. trial a randomized controlled study.The efficacy rate for the 32 treated Tsumura-Saireito 43.8% and Cepharanthin 18.8%; difference significant (p<0.05). No side effects were observed either group.These results indicate is more effective effusion than Cepharanthin.
To establish systematic guidelines for accelerator decommissioning, a large-scale activation survey was conducted at representative synchrotron radiation facilities in Japan. The neutron flux during operation measured with various dosimeters. A Monte Carlo simulation some to verify the special distribution and their spectra. Beam loss points, reflected as high-dose-rate areas, were identified by whole-beamline meter, generated radionuclides activity determined lanthanum bromide (LaBr3)...
Abstract Short-lived radionuclides for positron emission tomography (PET) examinations in medicine are produced mainly using on site small cyclotrons. The operation of the cyclotron generates a significant quantity neutrons, which will activate and surrounding materials. A new technique is proposed to estimate neutron fluxes rooms, bolts rooms were used as surrogates detectors. measurements carried out at four PET induced radioactivity was analyzed by gamma-ray spectroscopy elemental...
The activation level of the JAEA-Tokai tandem accelerator facility was investigated experimentally in advance future decommissioning. has a higher terminal voltage 18 MV and larger total floor area, Compared to other electrostatic accelerators with 1 6 MV. Therefore, determination for 'where,' 'what,' 'how many' nuclides are produced is crucial. Thermal neutrons generated by beam losses associated operations contribute significantly equipment facilities. accumulated activities of60Co...
Journal Article Radiation streaming experiment through a labyrinth of the 12 GeV proton accelerator facility at KEK(2)—TLD rem-counter method Get access H. Nakamura, Nakamura *Corresponding author: hajime.nakamura@kek.jp Search for other works by this author on: Oxford Academic PubMed Google Scholar T. Miura, Miura M. Numajiri, Numajiri N. Nakao, Nakao Nakashima, Nakashima Matsuda, Matsuda S. Watanabe Protection Dosimetry, Volume 116, Issue 1-4, 20 December 2005, Pages 252–255,...