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- 저자 : (Shirai K) (검색결과 12 건)
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Beam Spot Imaging System Using a Fluorescent Screen for Carbon-ion Radiotherapy
K. Mizushima,E. Takeshita,T. Furukawa,Y. Hara,T. Shirai,K. Katagiri,K. Noda 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.7
A two-dimensional (2D) beam imaging system with a fluorescent intensifying screen and highspeedcharge-coupled device (CCD) camera was developed to observe the fluctuations of the beamposition and size. This system can perform imaging of the beam spot and the calculation of bothits position and size from the obtained image with a cycle-time of 20 ms. For quality assurance ofscanned carbon-ion therapy, we measured the stability of the unscanned-beam position and size byusing this system at the isocenter in a treatment room. We confirmed that the fluctuation rangesof its position and size were less than the tolerance for scanning irradiation.
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REVIEW AND FUTURE ISSUES ON SPENT NUCLEAR FUEL STORAGE
Saegusa, T.,Shirai, K.,Arai, T.,Tani, J.,Takeda, H.,Wataru, M.,Sasahara, A.,Winston, P.L. Korean Nuclear Society 2010 Nuclear Engineering and Technology Vol.42 No.3
The safety of metal cask and concrete cask storage technology has been verified by CRIEPI through several research programs on demonstrative testing for the interim storage of spent fuel. The results have been reflected in the safety requirements for dry casks issued by NISA/METI (Nuclear and Industrial Safety Agency, Ministry of Economy, Trade and Industry) of the Japanese government. On top of that, spent fuel integrity has been studied by the Japan Nuclear Energy Safety Organization (JNES). This paper reviews these research programs. Future issues include the long-term integrity of cask components and high burn-up spent fuel.
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REVIEW AND FUTURE ISSUES ON SPENT NUCLEAR FUEL STORAGE
T. SAEGUSA,K. SHIRAI,T. ARAI,J. TANI,H. TAKEDA,M. WATARU,A. SASAHARA,P. L. WINSTON 한국원자력학회 2010 Nuclear Engineering and Technology Vol.42 No.3
The safety of metal cask and concrete cask storage technology has been verified by CRIEPI through several research programs on demonstrative testing for the interim storage of spent fuel. The results have been reflected in the safety requirements for dry casks issued by NISA/METI (Nuclear and Industrial Safety Agency, Ministry of Economy, Trade and Industry) of the Japanese government. On top of that, spent fuel integrity has been studied by the Japan Nuclear Energy Safety Organization (JNES). This paper reviews these research programs. Future issues include the long-term integrity of cask components and high burn-up spent fuel.
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T. Ahmed,H Shirai,L. Gamage,K. Soshin,M Nakoaka 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
This paper presents the voltage source type half bridge lossless auxiliary inductor snubber assisted series capacitor compensated resonant high frequency inverter for induction heated fixing roller in copy machines This high-frequency inverter treated here can completely achieve zero current soft switching (ZCS) commutation for wide power regulation range under its constant frequency pulse density modulation (PDM) scheme Its transient and steady-state operating principle is originally presented for a constant frequency PDM control strategy under a ZCS operation commutation, together with its output effective power regulation characteristics-based on the PDM strategy The experimental operating performances of this ZCS-PDM high frequency inverter using IGBTs are illustrated as compared with computer Simulation ones Its power losses and actual efficiency are evaluated and discussed on the basis of Simulation and experimental results.<br/>
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Y. Hara,T. Furukawa,K. Mizushima,S. Sato,T. Shirai,K. Noda,E. Takeshita 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.7
A two-dimensional dosimetry system was developed for the quality assurance (QA) of therapeuticscanned ion beams at Heavy Ion Medical Accelerator in Chiba (HIMAC). This system consists of afluorescent screen and a charge-coupled device (CCD) camera. To evaluate the performance of thissystem, we carried out a few experiments concerning QA procedures. A verification of this systemwas also carried out by comparing the film dosimetry and the ionization chamber array. Also, weverified several types of corrections for errors, e.g., background and vignetting, that distort themeasurement results. As a result, we confirmed that this system could be used for QA proceduresof the therapeutic scanned ion beams.
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T. Charinpanitkul,W. Suthabanditpong,H. Watanabe,T. Shirai,K. Faungnawakij,N. Viriya-empikul,M. Fuji 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.4
ZnO nanoparticles suspended in poly(acrylic acid) (PAA) were deposited onto layer-by-layer (LBL)polyelectrolyte (PET) films fabricated from poly(allylamine hydrochloride) (PAH) and PAA by dip coating method. Effect of etching time and concentration of ZnO suspension on hydrophilicity of the LBL-PET films before and after UV irradiation was examined using water contact angle measurement. 2.0 M PAH/PAA solutions with a dipping speed of 3.0 cm/min provided stable LBL-PET films with thickness sufficient for HCl etching. Glass substrates with the etched LBL-PET film dipped into 0.2 wt.% ZnO suspension exhibited the contact angle of 108 after irradiated by UV for 60 min.
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Adjustment Procedure for Beam Alignment in Scanned Ion-Beam Therapy
Y. Saraya,E. Takeshita,T. Furukawa,Y. Hara,K. Mizushima,N. Saotome,R. Tansho,T. Shirai,K. Noda 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.6
Control of the beam position for three-dimensional pencil-beam scanning is important because the position accuracy of the beam significantly impacts the alignment of the irradiation field. To suppress this effect, we have developed a simple procedure for beamline tuning. At first, beamline tuning is performed with steering magnets and fluorescent screen monitors to converge the beam’s trajectory to a central orbit. Misalignment between the beam’s position and the reference axis is checked by using the verification system, which consists of a screen monitor and an acrylic phantom. If the beam position deviates from the reference axis, two pairs of steering magnets, which are placed on downstream of the beam transport line, will be corrected. These adjustments are iterated until the deviations for eleven energies of the beam are within 0.5 mm of the reference axis. To demonstrate the success of our procedure, we used our procedure to perform beam commissioning at the Kanagawa Cancer Center.
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