研究者詳細 - 瓜谷　章

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Conceptual Design of Compact Neutron Camera with Directional Neutron Detector for Nuclear Fusion Experimnt 査読有り

T. Iguchi, T. Iizuka, A. Uritani and J. Kawarabayashi

Fusion Technol. 39 巻 ( 2 ) 頁： 1147-1151 2001年3月

Pulse Shape Analysis on Mixed Beta Particle and Gamma-ray Source Measured by CdZnTe Semiconductor Detector by Means of Digital-Analog Hybrid Signal Processing Method 査読有り

M. Panitra Mardiyanto, A. Uritani, J. Kawarabayashi, T. Iguchi, H. Sakai

Journal of Nuclear Science and Technology 38 巻 ( 5 ) 頁： 306-311 2001年3月

Database for WWER-1000 Reactor Pressure Vessel IAEA Regional Project RER4/017

B. Osmera, V. Lyssakov, F. Cvachvec, F. Hudec, B. Jansky, J. Mikus, E. Novak, S. Posta, Z. Turzik, M. Hort, V. Krysl||SKODA, V. Smutny, S. Zaritsky, N. Alekseev, M. Gurevitch, A. Egorov, E. Brodkin, K. Ilieva, S. Belousov, J. Kovbasenko, A. Uritani, T. Misawa, C. Mori

ASTM/STP 1398 巻頁： 312-319 2001年2月

A Novel Neutron Spectrometer with Response of Wide Energy Range

ASTM/STP 1398 巻頁： 698-705 2001年2月

Development of Neutron and Gamma-Ray Flux Distribution Measurement System with Scintillator and Optical Fiber Combination

C. Mori, A. Uritani, T. Iguchi, S. Hayashi, Y. Takami, I. Kimura, M. Katagiri

ASTM/STP 1398 巻頁： 769-774 2001年2月

Simultaneous Measurement of Neutron Pulse Series in Time and Space by Using Position Sensitive Proportional Counter

ASTM/STP 1398 巻頁： 811-818 2001年2月

JT60Uにおける飛行時間型中性子スペクトロメータ

柴田康成，井口哲夫，瓜谷章，河原林順，Magnus Hoek，西谷建夫，森岡篤彦

放射線 27 巻 ( 1 ) 頁： 27-29 2001年1月

Neutron Energy Spectrum Estimation Method with Information on Direction of Neutron Incidence at Spaceborne Neutron Monitor

Y. Makihara, A. Uritani, T. Iguchi, J. Kawarabayashi, H. Toyokawa, N.Takeda, K. Kudo, S. Sato, S. Takagi, S. Iwai and C. Mori

Proc. of 15th Workshop on Rsdistion Detectord and Their Uses 2001 巻 ( 20 ) 頁： 140-149 2001年

Digital Waveform Analysis for ³He Ionization Chamber

J. Kawarabayashi, M. P. Mardiyanto, A. Uritani, T. Iguchi, J. Kaneko, H. Takeuchi

Nuclear Science Symposium Conference Record, 2000 IEEE 2 巻頁： 9/193 - 9/195 2000年10月

記述言語：英語

Numerical analyses on individual pulses from a cylindrical 3 He gas ionization chamber have been performed. A radial distribution of the electron ion pairs was successfully analyzed by a deconvolution technique combined with a digital waveform analysis. From the charge distribution, clear separation of events of the reactions of 3He(n,p)T and 3He(n,n)3He at the energy range of the 3He recoil edge was observed.

Radiation Distribution Sensing with Normal Optical Fiber

R. Naka, J. Kawarabayashi, A. Uritani, T. Iguchi, J. Kaneko, H. Takeuchi, T. Kakuta

Nuclear Science Symposium Conference Record, 2000 IEEE 1 巻頁： 6/231 - 6/234 2000年10月

記述言語：英語

The purpose of this study is to develop a radiation distribution monitor using a normal plastic optical fiber. The monitor has a long operating length and can obtain continuous radiation distributions. A principle of;the position sensing is based on a time-of-flight technique. The monitor is sensitive to beta rays or charged particles, gamma rays, and fast neutrons. The spatial resolutions for beta rays ( 90Sr-90Y), gamma rays (137Cs) and D-T neutrons are 30 cm, 37 cm and 13 cm, respectively. The detection efficiencies for the beta rays, the gamma rays and D-T neutrons are 0.11%, 1.6×10-5% and 1.2×10-4%, respectively. The effective attenuation length of the detection efficiency is 18 m. In this paper, we describe the basic characteristics of this monitor.

Development of Directional Neutron Detector for Compact Fast Neutron Camera

T. Iguchi, S. Iizuka, A. Uritani, J. Kawarabayashi

Nuclear Science Symposium Conference Record, 2000 IEEE 1 巻頁： 6/207 - 6/210 2000年10月

記述言語：英語

A new concept of compact neutron camera with directional neutron detector arrays is proposed for nuclear fusion experiment. The basic performance of the directional neutron detector is made clear through experiment for a prototype detector with 14 MeV neutrons and design consideration of the detector specification to optimize its directionality. The results show that the angle resolution defined as a full width of neutron incident angles at a half maximum of detector counts would reach up to around 4 degrees at minimum around 45 degrees neutron incidence to the detector axis. The concept for a compact neutron camera is also given by making good use of an array of the optimized directional neutron detectors.

Evaluation of Response Functions of 16"x16"x4" NaI Scintillation Detector for Environmental Gamma-ray Survey

H. Itadzu, T. Iguchi, A. Uritani and J. Kawarabayashi

Proceedings of the Second International Workshop on EGS 頁： 250-254 2000年8月

円錐状突起電極型放射線画像検出器の開発

寿山大介、河原林順、瓜谷章、井口哲夫

放射線 26 巻 ( 2 ) 頁： 77-80 2000年4月

通常光ファイバーを用いた放射線分布センシングに関する基礎研究

中亮太郎、河原林順、瓜谷章、井口哲夫、金子純一、竹内浩、角田恒巳

放射線 26 巻 ( 2 ) 頁： 71-75 2000年4月

Improvement of Energy Spectrum Characteristics of CdZnTe Semiconductor Detector with a Digital-analog Fusion Method 査読有り

M.P. Mardiyanto, A. Uritani, H. Sakai, J. Kawarabayashi, and T. Iguchi

Nucl. Instr. and Methods A441 巻 ( 3 ) 頁： 483-488 2000年3月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

We present a new application of a `Fusion Method' to improve gamma-ray energy spectrum characteristics of a CdZnTe semiconductor detector. A digital and an analog system are simultaneously applied for the detector output; The digital system digitizes the signal pulse shapes for pattern recognition based on a neural network algorithm. The analog measures the signal pulse heights with a conventional analog system. The digital and the analog output data are fused and then used for improvement of the energy spectrum characteristics, i.e. the photopeak area, the peak-to-valley ratio, and the FWHM of photopeaks.

Pulse Shape Analysis Based on Similarity and Neural Network with Digital-Analog Fusion Method

M.P. Mardiyanto, A. Uritani, H. Sakai, J. Kawarabayashi, and T. Iguchi

Proc. 14th W. S. on Radiation Detectors and Their Uses, KEK Proc. 2000 巻頁： 132-141 2000年

Development of Failed Fuel Detection and Location Technique Using Resonance Ionization Mass Spectrometry: Improvement of the Detection Limit with Pulsed Supersonic Valve

Kenichi Watanabe, Tetsuo Iguchi, Toshiyuki Ogita, Takeshi Watanabe, Akira Uritani, Jun Kawarabayashi, Hideki Harano and Shoichi Nose

Proc. 14th W. S. on Radiation Detectors and Their Uses, KEK Proc. 2000 巻 ( 14 ) 頁： 183-190 2000年

Neutron/Proton Discrimination Characteristics of Spaceborne Neutron Monitors,

Y. Makihara, A. Uritani, T. Iguchi, J. Kawarabayashi, H. Toyokawa, Y. Uwamino, O. Sato, S. Takagi, S. Iwai and C. Mori

Proc. 14th W. S. on Radiation Detectors and Their Uses, KEK Proc 2000 巻 ( 14 ) 頁： 155-162 2000年

Pulse Shape Recognition for CdZnTe Semiconductor Detector by using Multi-shaping Amplifiers Method with Neural Network Algorithm 査読有り

H. Sakai, A. Uritani, C. Mori and T. Iguchi

IEEE Trans. Nuclear Science NS-46 巻 ( 4 ) 頁： 806-809 1999年8月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

A new pulse shape recognition method with multi-shaping amplifiers, combined with a neural network algorithm, has been developed, where four pulse heights are sampled from one signal pulse through four linear amplifiers with different shaping time constants. The four pulse heights are used as characteristic parameters to recognize the pulse shape with a neural network. This method has been applied to signal processing for a CdZnTe semiconductor detector to improve the deteriorated energy spectra caused by pulse height deficits due to the different mobilities of electrons and holes in the detector. The neural network recognizes the pulse shape patterns and provides the corrective magnification factors of the pulse heights. After the corrective procedure, the energy spectrum for 137Cs gamma-rays is improved from 9.3 keV to 7.4 keV in the energy resolution (FWHM) of the 662 keV gamma rays photopeak. The photopeak becomes a considerably symmetrical shape without a low-energy tail. It has been verified that this method is simple and useful for pulse shape analyses, which can be used for many other applications.

Measurement of the Thermal and Fast Neutron Flux in a Research Reactor with a Li and Th Loaded Optical Fibre Detector 査読有り

Y. Yamane, A. Uritani, T. Misawa, J. K-H. Karlsson and I. Pazsit

Nucl. Inst. and Methods A432 巻 ( 2-3 ) 頁： 403-409 1999年8月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

The spatial dependence of thermal and fast neutron flux was measured axially in the core of a 1 MW research reactor. The measurements were made by a thin optical fibre detector with a neutron sensitive ZnS(Ag) scintillation tip. For thermal neutrons 6Li was used, whereas for fast neutrons 232Th was used as neutron converter. The spatial dependence was measured by moving the fibre axially with a uniform speed. The measurement takes a few minutes, compared to up to 10 h with the conventional wire activation method. Comparison with traditional measurements shows a good agreement.

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