研究者データベース

金子 純一(カネコ ジユンイチ)
工学研究院 応用量子科学部門 物質量子工学
准教授

基本情報

所属

  • 工学研究院 応用量子科学部門 物質量子工学

職名

  • 准教授

学位

  • 博士(工学)(東京大学)
  • 経営管理修士(専門職)(小樽商科大学)

J-Global ID

研究キーワード

  • ダイヤモンド・cBN等の評価と開発   放射線医用・医療工学   放射線計測   Development of radiation detectors   

研究分野

  • ものづくり技術(機械・電気電子・化学工学) / 電子デバイス、電子機器
  • ライフサイエンス / 医用システム
  • エネルギー / 原子力工学

所属学協会

  • 医療物理学会   日本中性子科学会   応用物理学会   ニューダイヤモンドフォーラム   日本原子力学会   

研究活動情報

書籍

  • ダイヤモンドエレクトロニクスの最前線
    シーエムシー出版 2008年
  • Frontier of Diamond for Electronics Applications
    CMC books 2008年

その他活動・業績

  • Junichi H. Kaneko, Fumiyuki Fujita, Yuta Konno, Takuto Gotoh, Norihiko Nishi, Hideyuki Watanabe, Akiyoshi Chayahara, Hitoshi Umezawa, Nobuteru Tsubouchi, Shinichi Shikata, Mitsutaka Isobe DIAMOND AND RELATED MATERIALS 26 45 -49 2012年07月 [査読無し][通常論文]
     
    As part of the development of diamond radiation detectors for energy spectrometry, quality improvement of CVD diamond single crystals was conducted mainly by measures of single diamond substrates. To suppress stress resulting from unconformity of lattice spacing between a substrate and a grown layer, which sometimes causes breakage, HP/HT type IIa diamond single-crystal substrates were adopted, and it resulted successfully. In addition an off-axis (001) surface was fabricated on the substrate to reduce abnormal growth. A lift-off method was adopted to reuse the HP/HT type IIa substrate with an off-axis (001) surface. Judging from peaks caused by free exciton recombination in cathode luminescence spectra, growth conditions more strongly affected the diamond crystal quality than substrates of any kind. Energy resolution of 0.6% for alpha particles was obtained by one CVD diamond single crystal. Charge collection efficiency of approximately 100% and 95% for holes and electrons was achieved. Step bunching caused by residual gas was observed on the grown CVD diamond surface. From the perspective of charge carriers' transportation measurement, the reduction of residual gas and optimization of growth conditions are indispensable. (c) 2012 Elsevier B.V. All rights reserved.
  • Hiroki Shirato, Rikiya Onimaru, Masayori Ishikawa, Jun-ichi Kaneko, Tsuguhide Takeshima, Kenta Mochizuki, Shinichi Shimizu, Kikuo Umegaki CANCER SCIENCE 103 (1) 1 -6 2012年01月 [査読無し][通常論文]
     
    Respiratory motion considerably influences dose distribution, and thus clinical outcomes in radiotherapy for lung cancer. Breath holding, breath coaching, respiratory gating with external surrogates, and mathematical predicting models all have inevitable uncertainty due to the unpredictable variations of internal tumor motion. The amplitude of the same tumor can vary with standard deviations >5 mm occurring in 23% of T12N0M0 non-small cell lung cancers. Residual motion varied 16 mm (95th percentile) for the 40% duty cycle of respiratory gating with external surrogates. The 4-D computed tomography is vulnerable to problems relating to the external surrogates. Real-time 4-D radiotherapy (4DRT), where the temporal changes in anatomy during the delivery of radiotherapy are explicitly considered in real time, is emerging as a new method to reduce these known sources of uncertainty. Fluoroscopic, real-time tumor-tracking technology using internal fiducial markers near the tumor has +/- 2 mm accuracy, and has achieved promising clinical results when used with X-ray therapy. Instantaneous irradiation based on real-time verification of internal fiducial markers is considered the minimal requisite for real-time 4DRT of lung cancers at present. Real-time tracking radiotherapy using gamma rays from positron emitters in tumors is in the preclinical research stage, but has been successful in experiments in small animals. Real-time tumor tracking via spot-scanning proton beam therapy has the capability to cure large lung cancers in motion, and is expected to be the next-generation real-time 4DRT. (Cancer Sci 2012; 103: 16)
  • Improvement of crystal quality of a homoepitaxially grown diamond layer by a plasma etching treatment for a diamond substrate
    PROGRESS IN NUCLEAR SCIENCE AND TECHNOLOGY 1 255 -258 2011年 [査読無し][通常論文]
  • Luminescence properties and Crystal structures of Pr-doped gadolinium pyrosilicate
    PROGRESS IN NUCLEAR SCIENCE AND TECHNOLOGY 288 -291 2011年 [査読無し][通常論文]
  • Improvmement of scintillation characteristics of FZ growth Ce:GPS crystals by annealing in air
    PROGRESS IN NUCLEAR SCIENCE AND TECHNOLOGY 1 279 -281 2011年 [査読無し][通常論文]
  • M. Isobe, H. Yamanishi, M. Osakabe, H. Miyake, H. Tomita, K. Watanabe, H. Iwai, Y. Nomura, N. Nishio, K. Ishii, J. H. Kaneko, J. Kawarabayashi, E. Takada, A. Uritani, M. Sasao, T. Iguchi, Y. Takeiri, H. Yamada REVIEW OF SCIENTIFIC INSTRUMENTS 81 (10) 10D310-1-10D310-5 2010年10月 [査読無し][通常論文]
     
    Deuterium experiment on the Large Helical Device (LHD) is now being planned at the National Institute for Fusion Science. The fusion product diagnostics systems currently considered for installation on LHD are described in this paper. The systems will include a time-resolved neutron yield monitor based on neutron gas counters, a time-integrated neutron yield monitor based on activation techniques, a multicollimator scintillation detector array for diagnosing spatial distribution of neutron emission rate, 2.5 MeV neutron spectrometer, 14 MeV neutron counter, and prompt gamma-ray diagnostics. (C) 2010 American Institute of Physics. [doi:10.1063/1.3492383]
  • F. Fujita, A. Kakimoto, J. H. Kaneko, N. Tsubouchi, Y. Mokuno, A. Chayahara, K. Sato, Y. Konno, A. Homma, S. Shikata, M. Furusaka DIAMOND AND RELATED MATERIALS 19 (2-3) 162 -165 2010年02月 [査読無し][通常論文]
     
    Using lift-off method, we synthesized large self-standing plasma CVD diamond films on various substrates. Charge carrier transportation in diamond was measured using alpha particle measurements and TOF methods with a short-pulsed UV laser. The high-quality films were synthesized rapidly. We observed the maximum transit time of holes and electrons shorter than 5 ns. The lift-off method is useful to fabricate the high-quality diamond with excellent drift velocities of the charge carrier. The charge transport characteristics of our diamond films are comparable to those of a commercially available (Element Six Ltd.) electronics grade Ila diamond single crystal. (C) 2009 Elsevier B.V. All rights reserved.
  • Sohan Kawamura, Mikio Higuchi, Junichi H. Kaneko, Shusuke Nishiyama, Jun Haruna, Shohei Saeki, Shunsuke Ueda, Kazuhisa Kurashige, Hiroyuki Ishibashi, Michihiro Furusaka CRYSTAL GROWTH & DESIGN 9 (3) 1470 -1473 2009年03月 [査読無し][通常論文]
     
    The melting and solidification behavior of the (Gd0.9Ce0.1)(2)Si2O7 (Ce:GPS) which shows attractive scintillation performance was investigated by means of the slow cooling floating zone (SCFZ) method. Although Ce:GPS melts incongruently, the peritectic composition is estimated to be very close to the GPS composition, less than 67.0 mol % of SiO2 in the (Gd,Ce)(2)O-3-SiO2 system. Constitutional supercooling occurred when approximately 70% volume of the melt was solidified, consequently, the lamellar structure consists of Ce:GPS and the amorphous phase was obtained. On the basis of our study, it is estimated that a volume of 70% of the starting material, whose composition is SiO2 = 67 mol % in the (Gd,Ce)(2)O-3-SiO2 system at Ce 10 mol %, can be solidified as the GPS phase using top-seeded solution growth (TSSG) with the self-flux of SiO2.
  • S. Fukumoto, A. Homma, J. H. Kaneko, Y. Nishibayashi, Y. Yamamoto, A. Ueda, F. Fujita, S. Kawamura, K. Sato, T. Imai, M. Furusaka DIAMOND AND RELATED MATERIALS 18 (2-3) 287 -291 2009年02月 [査読無し][通常論文]
     
    Electron emission characteristics of needle-type semiconductor diamond electron emitters with pulsed bias operation were evaluated. An X-ray generation experiment was performed. Fowler-Nordheim plotting confirmed that field emission completely governed the electron emission. Maximum emission current of 4.2 mA was achieved using an n-type diamond needle. The needle tip, with area smaller than 1 mu m(2), had estimated electron emission density greater than 4.2 x 10(5) A/cm(2). The effective emission area obtained from the Fowler-Nordheim plot was several 10(-13) cm(2). For adopting and emission area of 1 X 10(-12) cm(2), the estimated electron emission density was higher than 4.2 x 10(9) A/cm(2). Furthermore, the average emission current was 0.5-0.6 mA. This large electron emission was continued for several seconds and repeatable. A threshold electric field existed for electron emission higher than 50 kV/mm; pulsed electron emissions of less than 30 ms were created by slow triangular waveform shaped bias voltage supplied at frequencies of 5-10 Hz. An improved vacuum level and pulsed bias operation prevented damage to diamond electron emitters and steady electron emission better than with thermoelectronic emission and high bias voltage supply in DC mode; continuous X-ray generation of 1 h was achieved. (C) 2008 Elsevier B.V. All rights reserved.
  • Scintillation characteristics of (Gd1-xCex)2Si2O7(x=0.025-0.25) single crystals fabricated by floating zone method
    IEEE Trans. NS 56 (1) 328 -330 2009年 [査読無し][通常論文]
  • Measurement of charge carriers' transportation in large size self-standing CVD single crystal diamonds fabricated by a lift-off method
    Diamond and Related materials In Press 2009年 [査読無し][通常論文]
  • J. Nucl. Sci. Tech. Supplement 5 391 -394 2008年 [査読無し][通常論文]
  • OSHIKI Y, KANEKO J.h, FUJITA F, HOMMA A, WATANABE H, MEGURO K, YAMAMOTO Y, IMAI T, SATO K, TSUJI K, KAWAMURA S, FURUSAKA M Diamond and Related Materials 17 (4-5) 833 -837 2008年 [査読無し][通常論文]
  • FUKUMOTO S, HONMA A, KANEKO J.h, NISHIBAYASHI Y, UEDA A, YAMAMOTO Y, IMAI T, FUJITA F, KAWAMURA S, FURUSAKA M Diamond and Related materials 17 (4-5) 764 -767 2008年 [査読無し][通常論文]
  • OHSHITA H, IWASAKI H, KANEKO J, KIYAMURA H, NAKAO M, OCHI A, OCHIAI K, TAKESHITA T, TANAKA S Nucl. Instrum. Meth. A 587 (2-3) 259 -265 2008年 [査読無し][通常論文]
  • Sohan Kawamura, Junichi H. Kaneko, Mikio Higuchi, Fumiyuki Fujita, Akira Homma, Jun Haruna, Shohei Saeki, Kazuhisa Kurashige, Hiroyuki Ishibashi, Michihiro Furusaka NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 583 (2-3) 356 -359 2007年12月 [査読無し][通常論文]
     
    As a novel scintillation material, the use of Ce-doped Gd(2)Si(2)O(7) was investigated. In fact, (Gd(0.9)Ce(0.1))(2)Si(6)O(7) powder showed about 1.2 times greater light output than Gd(2)SiO(5) (GSO) single crystals for alpha particles of (241)Am. Furthermore, a fast decay constant of 52 ns was obtained for alpha-particles of (241)Am. Relations between the Ce concentration, crystal structure, and luminescence characteristics were also elucidated. Results of these studies show that heavy Ce doping alters the Gd(2)Si(2)O(7) crystal structure and that the luminescence intensity is dependent not on Cc concentration, but on the triclinic structure formed by heavy Cc doping. (c) 2007 Elsevier B.V. All rights reserved.
  • Sohan Kawamura, Junichi H. Kaneko, Mikio Higuchi, Fumiyuki Fujita, Akira Homma, Jun Haruna, Shohei Saeki, Kazuhisa Kurashige, Hiroyuki Ishibashi, Michihiro Furusaka NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 583 (2-3) 356 -359 2007年12月 [査読無し][通常論文]
     
    As a novel scintillation material, the use of Ce-doped Gd(2)Si(2)O(7) was investigated. In fact, (Gd(0.9)Ce(0.1))(2)Si(6)O(7) powder showed about 1.2 times greater light output than Gd(2)SiO(5) (GSO) single crystals for alpha particles of (241)Am. Furthermore, a fast decay constant of 52 ns was obtained for alpha-particles of (241)Am. Relations between the Ce concentration, crystal structure, and luminescence characteristics were also elucidated. Results of these studies show that heavy Ce doping alters the Gd(2)Si(2)O(7) crystal structure and that the luminescence intensity is dependent not on Cc concentration, but on the triclinic structure formed by heavy Cc doping. (c) 2007 Elsevier B.V. All rights reserved.
  • S. Kawamura, J. H. Kaneko, M. Higuchi, T. Yamaguchi, J. Haruna, Y. Yagi, K. Susa, F. Fujita, A. Homma, S. Nishiyama, K. Kurashige, H. Ishibashi, M. Furusaka IEEE TRANSACTIONS ON NUCLEAR SCIENCE 54 (4) 1383 -1386 2007年08月 [査読無し][通常論文]
     
    Growth of cerium-doped gadolinium pyrosilicate (Ce:Gd2Si2O7) single crystals, which show 2.5 times greater light output for gamma-rays and five times greater light output for alpha-particles than GSO single crystals, is accomplished using the floating zone growth method (FZ method). Although growth of Gd2Si2O7 (GPS) single crystal is considered to be difficult because it melts incongruently according to the phase diagram of Gd2O3-SiO2 system, we attempted crystal growth of Ce:GPS because of the possibility that heavy Ce doping would change the phase diagram. Transparent single crystals were obtained, although some cracks were observed in the crystals. The crystal structure was triclinic with P/1 space group and density of 5.5 g/cm(3). Two peaks, which were observed using photoluminescence spectrometry at 372 nm and 394 nm, were attributed to 5d-4f transition in Ce3+ ion. Decay times of Ce:GPS scintillation were 46 ns for gamma-ray excitation and 39 ns for alpha-particle excitation. We consider that fabrication of crack free crystals will improve the energy resolution.
  • S. Kawamura, J. H. Kaneko, M. Higuchi, T. Yamaguchi, J. Haruna, Y. Yagi, K. Susa, F. Fujita, A. Homma, S. Nishiyama, K. Kurashige, H. Ishibashi, M. Furusaka IEEE TRANSACTIONS ON NUCLEAR SCIENCE 54 (4) 1383 -1386 2007年08月 [査読無し][通常論文]
     
    Growth of cerium-doped gadolinium pyrosilicate (Ce:Gd2Si2O7) single crystals, which show 2.5 times greater light output for gamma-rays and five times greater light output for alpha-particles than GSO single crystals, is accomplished using the floating zone growth method (FZ method). Although growth of Gd2Si2O7 (GPS) single crystal is considered to be difficult because it melts incongruently according to the phase diagram of Gd2O3-SiO2 system, we attempted crystal growth of Ce:GPS because of the possibility that heavy Ce doping would change the phase diagram. Transparent single crystals were obtained, although some cracks were observed in the crystals. The crystal structure was triclinic with P/1 space group and density of 5.5 g/cm(3). Two peaks, which were observed using photoluminescence spectrometry at 372 nm and 394 nm, were attributed to 5d-4f transition in Ce3+ ion. Decay times of Ce:GPS scintillation were 46 ns for gamma-ray excitation and 39 ns for alpha-particle excitation. We consider that fabrication of crack free crystals will improve the energy resolution.
  • J. H. Kaneko, T. Taniguchi, S. Kawamura, K. Satou, F. Fujita, A. Homma, M. Furusaka NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 576 (2-3) 417 -421 2007年06月 [査読無し][通常論文]
     
    Radiation detectors were fabricated using single and polycrystalline cubic boron nitride (cBN) crystals synthesized using a high-pressure and high-temperature (HP/HT) method. Although cBN single crystals obtained using a barium BN solvent system were nearly colorless and displayed high electrical resistance, in contrast to conventional amber-colored crystals, the single crystals exhibit a leakage current that renders them unsuitable for use in a detector. In contrast, a detector made of a cBN polycrystal synthesized by direct transformation had a very low leakage current of 0.2pA with bias voltage of 100V; it functioned as a radiation detector. From an experiment using alpha-particles, holes traversed a longer distance than electrons. It had a fast rise time of approximately 300ns. The detector also showed sensitivity to neutrons. However, output signals were smaller than the expected voltage from the experiment using alpha-particles, probably because of charge accumulation from the high-neutron flux. (C) 2007 Elsevier B.V. All rights reserved.
  • F. Fujita, Y. Oshiki, J. H. Kaneko, A. Homma, K. Tsuji, K. Meguro, Y. Yamamoto, T. Imai, H. Watanabe, T. Teraji, S. Kawamura, M. Furusaka DIAMOND AND RELATED MATERIALS 15 (11-12) 1921 -1925 2006年11月 [査読無し][通常論文]
     
    A fast TOF measurement system with 150 ps time resolution for transport behavior of free charge carriers in an intrinsic diamond film by using a UV pulsed laser was developed. The 213 nm UV laser light narrowed to approximately 80 mu m widths could locally create hole-electron pairs in selected locations on a diamond film between two parallel electrodes on the surface. This system measured accurate charge transport characteristics in a diamond film, because created charge carriers moved in a part of the diamond film where they did not get any influence from the laser irradiation. Diamond samples used for verification of the TOF system were intrinsic CVD diamond films with thickness between 4 and 10 mu m grown on HP/HT diamond substrates. Transit time of holes for one diamond film was 4.7 ns with a traverse distance of 250 mu m. The local irradiation of laser made it possible to measure transport characteristics of electrons and holes separately. In addition, it substantially reduced the influence of photoelectron, because the laser beam did not irradiate electrodes. Through several examinations, excellent reliability of the TOF system was confirmed. (c) 2006 Elsevier B.V. All rights reserved.
  • Atsuhiko Ochi, Hironori Kiyamura, Junichi Kaneko, Hidetoshi Ohshita, Tohru Takeshita, Shuji Tanaka, Hiroyuki Iwasaki, Kentaro Ochiai, Makoto Nakao REVIEW OF SCIENTIFIC INSTRUMENTS 77 (10) 10E709 2006年10月 [査読無し][通常論文]
     
    Thin gap chamber (TGC) is a very thin multiwire proportional chamber of only a few millimeters. It has a quick response (about 20 ns), and its production costs are relatively low. TGCs have been used as large area detectors in high energy physics such as Large Electron-Positron collider (LEP) and will be used in the Large Hadron collider (LHC) experiment. However, the characteristics of TGCs under neutrons are not yet clearly understood. As the energy deposits of several MeV neutrons in TGCs are large, the possible effect of these deposits on the operation of the detector is a concern. We studied TGC performance in relation to efficiency, charge distribution, and operation stability using several gas mixtures (CO2/n-pentane and CF4/n-pentane) with 2.5 and 14 MeV neutron sources at Fusion Neutronics Source (FNS) in Japan Atomic Energy Agency. Operation stability using a CF4 based gas was more than 100 times greater than with CO2 based gas, while the minimum ionizing particle signal gain was almost the same. The detection efficiencies were around 0.1% (14 MeV) and 0.02% (2.5 MeV). These results are consistent with our simulation studies. (c) 2006 American Institute of Physics.
  • Y. Oshiki, J. H. Kaneko, F. Fujita, K. Hayashi, K. Meguro, A. Homma, S. Kawamura, Y. Yokota, Y. Yamamoto, K. Kobashi, T. Imai, T. Sawamura, M. Furusaka DIAMOND AND RELATED MATERIALS 15 (10) 1508 -1512 2006年10月 [査読無し][通常論文]
     
    Drift velocities of charge carriers in polycrystalline diamonds were measured by a self-triggered time-of-flight (TOF) method with alpha particles based on a radiation measurement technique. Based on these measured results, a synthesis method for polycrystalline diamond was verified, and the electric properties of polycrystalline diamonds were improved; drift velocity was increased from 5 x 10(2) to 3 x 10(4) cm/s. The mean free paths (MFPs) of capture of charge carriers in a CVD single crystal diamond was obtained by induced charge distribution measurements with alpha particles, and drift velocity was measured by another TOF method using. a UV pulsed laser. MFPs of capture of electron and hole in a CVD single crystal diamond were determined to be 5.4 and 9.6 mu m, respectively; the hole and electron drift velocities were 5 x 10(5) cm/s and 3 x 10(5) cm/s in an electric field of 24.4 kV/cm, respectively. For diamond, short transit times of several nanoseconds and short MFPs of capture in several micrometers were successfully obtained for the first time by combining of these methods. (c) 2005 Elsevier B.V. All rights reserved.
  • Investigation on possibility of PMN-PT single-crystal as neutron optical device
    Physica B 1277 -1279 2006年 [査読無し][通常論文]
  • Performance tests for Thin Gap Chamber under several MeV neutron sources
    Rev. Sci. Instrum 10E709 2006年 [査読無し][通常論文]
  • M Wakisaka, J Kaneko, F Fujita, K Ochiai, T Nishitani, S Yoshida, T Sawamura NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 554 (1-3) 347 -355 2005年12月 [査読無し][通常論文]
     
    The process of neutron leaking from a 14 MeV neutron source facility was analyzed by calculations and experiments. The experiments were performed at the Fusion Neutron Source (FNS) facility of the Japan Atornic Energy Institute, Tokai-mura, Japan, which has a port on the roof for skyshine experiments, and a 3 He counter surrounded with a polyethylene moderator of different thicknesses was used to estimate the energy spectra and dose distributions. The He-3 counter with a 3-cm-thick moderator was also used for dose measurements, and the doses evaluated by the counter Counts and the calculated count-to-dose conversion factor agreed with the calculations to within similar to 30%. The dose distribution was found to fit a simple analytical expression, D(r) = Q(D) exp(-r/lambda(D))/r and the parameters Q(D) and lambda(D) are discussed. (c) 2005 Published by Elsevier B.V.
  • K Tsuji, K Hayashi, JH Kaneko, F Fujita, A Homma, Y Oshiki, T Sawamura, M Furusaka DIAMOND AND RELATED MATERIALS 14 (11-12) 2035 -2038 2005年11月 [査読無し][通常論文]
     
    UV position-sensitive sensor using a polycrystalline highly-oriented diamond film with a sensitive area of 2 x 4.5 mm(2) developed, and a proof-of-concept Study was conducted. The charge division method was employed to establish the position when the light hits the sensitive area. A fifth higher harmonic of a Nd:YAG laser with pulse width of 100 ps was used as a light source. The position resolution was 0.25 mm, and there was good position linearity throughout the sensitive area. Considering the possibility of light-spot broadening due to diffraction by the slit, the sensor may have a better resolution than that indicated by the result. But the electric-field strength of some parts of the crystal was insufficient, the response time was relatively slow, approximately 0.5 ins. (c) 2005 Elsevier B.V. All rights reserved.
  • JH Kaneko, T Tanaka, S Kawamura, Y Oshiki, K Tsuji, M Katagiri, K Ochiai, T Nishitani, F Fujita, T Sawamura, T Iida, M Furusaka DIAMOND AND RELATED MATERIALS 14 (11-12) 2027 -2030 2005年11月 [査読無し][通常論文]
     
    Radiation detector was made of a high-quality CVD polycrystalline diamond composed of frost column like structure diamond grains, and induced charge distribution spectra and drill velocities were measured by using alpha particles. As a result, the CVD polycrystalline achieved maximum induced charge of 83% of HP/HT type IIa diamond. Moreover, the CVD crystal had lower charge loss on electrons compared with the HP/HT type IIa diamond. Drift velocities of electrons and holes were nu(e)=7.7 x 10(4) and nu(h)=7.3 x 10(4) cm/s at an electric field of 20 kV/cm, respectively. In addition, response function measurement for 14 MeV neutrons was carried Out. (c) 2005 Elsevier B.V. All rights reserved.
  • T Tanaka, JH Kaneko, Y Kasugai, M Katagiri, H Takeuchi, T Nishitani, T Iida DIAMOND AND RELATED MATERIALS 14 (11-12) 2031 -2034 2005年11月 [査読無し][通常論文]
     
    Radiation tolerance of a type IIa synthetic diamond detector was examined from irradiation of mono-energetic 14 MeV neutrons. Measurements of I-V (current-voltage) characteristics and energy spectrum for 5.486 MeV alpha particles were performed after neutron irradiation. In the I-V characteristics measurement, enhancement of rectification was observed after neutron irradiation of up to 2.0 x 10(12) n/cm(2). Concurrently with the enhancement of rectification, significant decrease in signal amplitude was observed in energy spectrum measurement for alpha particles. It is considered that these changes were due to increase in the concentration of defects acting as shallow energy levels in the forbidden band. For neutron irradiation of higher than 1.6 x 10(13) n/cm(2), weakening of the rectification characteristics and recovery of the signal amplitude were observed. These changes imply that deep energy levels, which were also considered to be introduced by defects, were dominant and weakened the effects of the shallow energy levels. Increase in the concentration of the deep trapping levels resulted in gradual decrease of the signal amplitude and degradation in the energy resolution. The peak for the alpha particles was obtained up to 5.5 x 10(13) n/cm(2). (c) 2005 Elsevier B.V. All rights reserved.
  • F Fujita, A Homma, Y Oshiki, JH Kaneko, K Tsuji, K Meguro, Y Yamamoto, T Imai, T Teraji, T Sawamura, M Furusaka DIAMOND AND RELATED MATERIALS 14 (11-12) 1992 -1994 2005年11月 [査読無し][通常論文]
     
    There are continuing efforts of developing faster FETs and diamond is one of the strong candidates as a base semiconductor. Since the upper-limit-frequency of diamond FETs determines saturated drift velocities of charge-carriers, we need to first characterize diamond to develop better FETs. It is, however, not easy to measure the velocities with response time of less than 20 ns. Therefore, we developed a drift velocity measurement system using a time-of-flight (TOF) technique with a UV laser with 100 ps pulse width. In order to realize response times faster than 20 ns, we employed a 50 Omega coaxial cable as a load, with which we could effectively reduce the stray capacitance and inductance, and also, suppress reflections in the signal which gives false signals. As a result, we can measure carrier-transit times shorter than 10 ns. (c) 2005 Elsevier B.V. All rights reserved.
  • M Ishikawa, H Kumada, K Yamamoto, J Kaneko, G Bengua, H Unesaki, Y Sakurai, K Tanaka, T Kosako NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 551 (2-3) 448 -457 2005年10月 [査読無し][通常論文]
     
    A wide range thermal neutron detector was developed based on the Scintillator with Optical Fiber (SOF) detector which has been previously used for thermal neutron monitoring during boron neutron capture therapy irradiation. With this new detector system we intended to address the issues of real-time thermal neutron flux measurement and the simultaneous measurement of a wide range of thermal neutron flux in a BNCT irradiation field which were difficult to implement with the gold wire activation method. The dynamic range of linearity of the SOF detector was expanded by using a plastic scintillator with a rapid decay time. On the other hand, the contribution of gamma rays and fast neutrons in the measured signals were compensated from those obtained by a pair of SOF detectors, one with a (LiF)-Li-6 neutron converter and the other without. The discrimination level for the measured signals was also optimized to further reduce the contribution of gamma rays and fast neutrons signals. A non-paralyzable system model was applied to correct for the dead-time in the detector system. A good agreement between the thermal neutron flux measured by the gold wire activation method and the paired SOF detector system was observed. However, measurements which would normally take a few days to perform with the gold wire activation method were obtained in just about 15 min using the SOF detector system. We also confirmed the dynamic range of linearity for the SOF detector system to be in the order of magnitude of 10(4). (c) 2005 Elsevier B.V. All rights reserved.
  • JH Kaneko, T Teraji, Y Hirai, M Shiraishi, S Kawamura, S Yoshizaki, T Ito, K Ochiai, T Nishitani, T Sawamura REVIEW OF SCIENTIFIC INSTRUMENTS 75 (10) 3581 -3584 2004年10月 [査読無し][通常論文]
     
    Response function measurement of layered-type chemical vapor deposition single crystal diamond radiation detectors for 14 MeV neutrons was carried out. The detector had a layered structure that was composed of a boron-doped diamond layer of 0.5 mum in thickness and a nondoped diamond layer of 20 mum on an inexpensive high pressure and high temperature-type Ib diamond substrate. The detector had energy resolution of 2.6% for 5.5 MeV alpha particles. This experiment was mainly carried out in order to understand the present status of the detector as a 14 MeV neutron spectrometer and an extent of charge trapping. As result, a peak caused by the C-12(n,alpha(0))Be-9 reactions was clearly observed; the best energy resolution of 6% as for a synthetic diamond radiation detector was achieved. Detection efficiency was 3.2x10(-7) counts/unit neutron fluence. However, taking the energy resolution for alpha particles, etc., into account, the energy resolution for 14 MeV neutrons was not so high. Further improvement based on better crystal growth is indispensable. (C) 2004 American Institute of Physics.
  • JH Kaneko, Y Otake, H Fujimoto, S Kawamura, M Watanabe, F Fujita, T Sawamura, P Mikula, M Furusaka NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 529 (1-3) 166 -168 2004年08月 [査読無し][通常論文]
     
    A principle verification experiment of neutron electric optical devices using piezoelectric single crystals was carried out. This neutron electric optical device can change its d-spacing by applying an electric field to the crystal, which results in change of the Bragg diffraction angle. Although an alpha-quartz has a small piezoelectric strain constant, an alpha-quartz was used in this experiment because characteristics of alpha-quartz are well known and it is easy to obtain high quality and large size single crystals. At first, macroscopic distortion and change of thickness caused by an applied electric field were observed by using laser interferometers. Thus, double crystal diffraction measurement using 4.7 Angstrom cold neutrons was carried out. For these experiments, DC bias voltage was applied to the crystal. As a result, peaks of rocking curves were shifted 14s at 500 V and 2 min at 1000 V from their original positions. These values were approximately one figure larger than the theoretical values; therefore, these results were influenced by macroscopic bending of the crystal. From these results, it can be concluded that the possibility of neutron electric optical devices using not only change of d-spacing but also macroscopic bending of piezoelectric crystal was confirmed. (C) 2004 Elsevier B.V. All rights reserved.
  • JH Kaneko, N Susa, S Tsuchida, M Watanabe, S Miura, T Mizuno, Y Yamauchi, M Hashiba, T Oku, A Homma, F Fujita, T Ino, M Furusaka, T Sawamura, HM Shimizu, Y Kiyanagi NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 529 (1-3) 307 -309 2004年08月 [査読無し][通常論文]
     
    A thin GSO scintillator was developed aiming at applications for the neutron science. In order to fabricate a large and thin GSO scintillator in the future, fabrication was started from two types of GSO powders. Although several GSO films were fabricated by evaporation techniques, these films did not have luminescence in photo luminescence (PL) spectroscopy. Thus, these samples were annealed up to 1550degreesC. However, it resulted in no luminescence observation. In response to these results, GSO powders were directly annealed; a phenomenon looking like melting and sintering were observed for Gd2Si2O7:Ce at a temperature higher than 1500degreesC. This sample was quasi-transparent and had luminescence at 405 nm in PL spectrum. In addition, this sample was tougher than a GSO single crystal. In conclusion, the prospect of fabrication of a thin GSO scintillator by combination of annealing and mechanical polishing was obtained. (C) 2004 Elsevier B.V. All rights reserved.
  • M Kitaichi, S Sawamura, M Wakisaka, JH Kaneko, K Ochiai, T Nishitani, T Sawamura RADIATION PROTECTION DOSIMETRY 110 (1-4) 731 -738 2004年 [査読無し][通常論文]
     
    In this study spatial and time distribution of neutrons leaking from Hokkaido University 45 MeV Electron Linac facility have measured and compared with the Monte Carlo simulations. The neutron transport processes inside and outside the facility building has been simulated using MCNP. The neutrons have measured by BF3 counters and He-3 counters with polyethylene moderators up to the distance of 330 in from the facility. The spatial distribution of ambient dose equivalent converted from the counts has been compared with the simulation. The distribution estimated from the counts by the BF3 counter has been shown fairly good agreement with the calculation. The spatial distribution of counts obtained at the 45 MeV Electron Linac facility has been compared with that obtained at the Fusion Neutronics Source (FNS) facility of JAERI. The difference between the propagation characteristics of neutrons leaking from those facilities has been discussed.
  • Measurement of Behavior of Charge Carriers’ and Investigation into Charge Trapping Mechanism in High-purity Type-IIa Diamond Single Crystals Grown by High-pressure and High-temperature Synthesis
    JH Kaneko, T Tanaka, Y Tanimura, A Birumati, Y Hirai, M Katagiri, Y Ikeda, T Nishitani, H Takeuchi, T Iida, T Sawamura New Diamond Frontier Carbon Tech 14 (5) 299 -311 2004年 [査読無し][通常論文]
     
    The behavior of charge carriers in type-IIa single diamond crystals grown by high-pressure and high-temperature synthesis was observed using nuclear methods. The drift velocities of holes and electrons were measured by a time-of-flight method using a particles from an Am-241 source. Although the drift velocities of holes and electrons were 6.7 x 10(5) cm/s at 30 kV/cm and 6.5 x 10(5) cm/s at 15 kV/cm, respectively, these values are less than 1/10 of the drift velocities of top-grade, high-purity natural-type IIa diamond single crystals reported elsewhere. In addition, pulse-height spectra, i.e., induced-charge distribution, were measured with light illumination to determine the energy levels of trapping centers, and it was revealed that illumination with red light released trapped electrons. Moreover, it was observed that red light illumination facilitated the quick release of trapped holes. To explain these experimental results, the Fermi level and ionizing ratio of impurities were calculated. Results show that nitrogen works as a trapping center for electrons and boron works as a trapping center for holes; probably this center had trapping and detrapping effects on holes. However, it was confirmed that holes could not play the role of a trapping center for electrons. Moreover, it was revealed that another energy level was required for a trapping center for electrons. To explain all experimental results, an energy level 0.6 eV above the valence band was assumed in addition to the nitrogen and boron impurities. In this case, several ppm of acceptor-like centers are required to function as trapping centers for electrons.
  • S Yoshida, T Nishitani, K Ochiai, J Kaneko, J Hori, S Sato, M Yamauchi, R Tanaka, M Nakao, M Wada, M Wakisaka, Murata, I, C Kutsukake, S Tanaka, T Sawamura, A Takahashi FUSION ENGINEERING AND DESIGN 69 (1-4) 637 -641 2003年09月 [査読無し][通常論文]
     
    The D-T neutron skyshine experiments have been carried out at the Fusion Neutronics Source (FNS) of JAERI with the neutron yield of similar to 1.7 x 10(11) n/s. The concrete thickness of the roof and the wall of a FNS target room are 1.15 and 2 in. respectively. The FNS skyshine port with a size of 0.9 x 0.9 m(2) was open during the experimental period. The radiation dose rate outside the target room was measured a maximum distance of 550 in from the D-T target point with a spherical rem-counter. Secondary gamma-rays were measured with high purity Ge detectors and NaI scintillation counters. The highest neutron dose was about 9 x 10(-22) Sv/(source neutron) at a distance of 30 in from the D-T target point and the dose rate was attenuated to 4 x 10(-24) Sv/(source neutron) at a distance of 550 in. The measured neutron dose distribution was analyzed with Monte Carlo code MCNP-4B and a simple line source model. The MCNP calculation overestimates the neutron dose in the distance range larger than 230 m. The line source model agrees well with the experimental results within the distance of 350 m. (C) 2003 Elsevier Science B.V. All rights reserved.
  • T Sawamura, JH Kaneko, M Abe, M Tamura, Murai, I, A Homma, F Fujita, S Tsuda NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 505 (1-2) 29 -32 2003年06月 [査読無し][通常論文]
     
    The response of superheated drop detectors or bubble detectors (BDs) was measured for quasi-monoenergetic neutron beams in the 40-75 MeV range and the effects of a lead-converter enclosing the detector introduced to extend the response to the high-energy region were discussed. The experiments were performed in the quasi-monoenergetic neutron beam field at the AVF cyclotron facility, TAKASAKI Ion Accelerator for Advanced Radiation Application (TIARA) of Japan Atomic Energy Research Institute(JAERI). Monte Carlo calculations by MCNPX code were carried out to estimate the lead-converter effect on neutron spectra in a detector exposed to 40-75 MeV quasi-monoenergetic source neutrons. The calculations indicated an increase in the energy ranges of the neutrons of 0.1-10 MeV and this can be expected to increase the number of bubbles produced in the detector. Experimental results showed that the sensitivity was lowered to about a half the nominal sensitivity and that a 3 cm thick lead-converter could compensate for the sensitivity decrease in the experimental energy region. (C) 2003 Elsevier Science B.V. All rights reserved.
  • JH Kaneko, T Tanaka, T Imai, Y Tanimura, M Katagiri, T Nishitani, H Takeuchi, T Sawamura, T Iida NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 505 (1-2) 187 -190 2003年06月 [査読無し][通常論文]
     
    The first investigation of a radiation detector made of a diamond single crystal grown by a chemical vapor deposition (CVD) method was successfully carried out. The diamond single crystal, having a size of 2.0 x 2.0 x 0.7 mm(3), was grown by the CVD method and then applied to the detector. The CVD method was able to reduce nitrogen and boron impurities in diamond crystals more effectively than a high-pressure and high-temperature (HP/HT) method. Consequently the detector had high-energy resolution of 0.4% for 5.486 MeV alpha particles from an Am-241 source. The behavior of charge carriers in the detector could not be adequately investigated because the detector had a partial depression layer and strong rectification. Ionization energy of the CVD diamond was determined to be 16.1 eV; this value was higher than that of the HP/HT type IIa diamond, i.e., 13.1 eV. This result shows the potential of CVD diamond single crystals because an ideal diamond should have higher ionization energy than the HP/HT type IIa diamond that had the influence of impurities. (C) 2003 Elsevier Science B.V. All rights reserved.
  • Deposition of high quality diamond films for UV/radiation detectors
    Proceedings of the 10th International symposium on advanced materials ISAM 2003 65 -66 2003年 [査読無し][通常論文]
  • Evaluation of Neutrons Leaking from the Accelerator Facilities
    9th Conf. Neutron Dosimetry Dosimeter 0 2003年 [査読無し][通常論文]
  • Superheated Emulsion --- As High Energy Neutron
    The 9th Conf. Neutron Dosimetry Dosimeter 126 2003年 [査読無し][通常論文]
  • 西谷 健夫, 落合 謙太郎, 吉田 茂生, 田中 良平, 脇坂 雅志, 中尾 誠, 佐藤 聡, 山内 通則, 堀 順一, 高橋 亮人, 金子 純一, 澤村 晃子 J. Plasma and Fusion Research 79 (3) 282 -289 2003年 [査読無し][通常論文]
  • Investigation on charge trapping mechanism in a high-purity HP/HT type IIa diamond single crystal using nuclear methods
    Proceedings of the 10th International symposium on advanced materials ISAM 2003 7 -8 2003年 [査読無し][通常論文]
  • Neutrons Leaked from a 45 MeV Linac Facility
    Proceedings of the 1st Asian Oceanic Congress for Radiation Protection (AOCRP-1) 0 2002年 [査読無し][通常論文]
  • In situ transmissivity measurements of KU1 quartz in the UV range under 14 MeV neutron irradiation
    J. Nucl. Materials 307 -311 2002年 [査読無し][通常論文]
  • UNO Y, KANEKO J, NISHITANI T, MAEKAWA F, TANAKA T, SHIBATA S, IKEDA Y, KHRIPUNOV V, WALKER C Fusion Eng. Des 56/57 895 -898 2001年 [査読無し][通常論文]
  • Study on X-Rays and Neutrons Leaked from a 45 MeV Electron Linac Facility
    J. Korean Asso. Radiat. Prot 26 (3) 133 -137 2001年 [査読無し][通常論文]
  • TANAKA T, KANEKO J, TAKEUCHI D, SUMIYA H, KATAGIRI M, NISHITANI T, TAKEUCHI H, IIDA T, OHKUSHI H Rev. Sci. Instrum 72 (2) 1406 -1410 2001年 [査読無し][通常論文]
  • Rev. Sci. Instrum. 72 (1) 809 -813 2001年 [査読無し][通常論文]
  • KAWARABAYASHI J, MARDIYANTO M P, URITANI A, IGUCHI T, KANEKO J, TAKEUCHI H IEEE Trans. Nucl. Sci 48 (3,Pt.1) 527 -529 2001年 [査読無し][通常論文]
  • NAKA R, WATANABE K, KAWARABAYASHI J, URITANI A, IGUCHI T, HAYASHI N, KOJIMA N, YOSHIDA T, KAKUTA T IEEE Trans. Nucl. Sci 48 (6,Pt.2) 2348 -2351 2001年 [査読無し][通常論文]
  • KONNO C, MAEKAWA F, KASUGAI Y, UNO Y, KANEKO J, NISHITANI T, WADA M, IKEDA Y, TAKEUCHI H Nuclear Fusion 41 (3) 333 -337 2001年 [査読無し][通常論文]
  • J. Kaneko, Y. Uno,
    72 (1) 809 -813 2001年 [査読無し][通常論文]
  • J Kaneko, C Yonezawa, Y Kasugai, H Sumiya, T Nishitani DIAMOND AND RELATED MATERIALS 9 (12) 2019 -2023 2000年12月 [査読無し][通常論文]
     
    Metallic impurities in high-purity type IIa and conventional type To diamond single crystals grown by high-pressure and high-temperature (HPHT) synthesis were determined by neutron activation analysis using thermal neutrons. Metallic impurities of Fe, Co, Cr and other minor elements were detected in the high-purity type IIa diamond crystal. The typical quantities of these metallic impurities were a few ppb. The influence of these metallic impurities on the electrical properties of the type IIa diamond crystal was practically negligible compared with nitrogen and boron impurities behaving as a donor and an acceptor, respectively. In addition to the impurities detected in the type IIa diamond crystal, Ni impurities of several hundreds of ppb were detected in conventional type Ib diamond crystals. A difference in molten metal solvents used in the synthesis of each diamond crystal resulted in the difference in metallic impurities. (C) 2000 Elsevier Science B.V. All rights reserved.
  • TANIMURA Y, KANEKO J, KATAGIRI M, IKEDA Y, NISHITANI T, TAKEUCHI H, IIDA T Nucl. Instrum. Meth 443 (2/3) 325 -330 2000年 [査読無し][通常論文]
  • C Mori, J Gotoh, A Uritani, H Miyahara, Y Ikeda, Y Kasugai, J Kaneko, M Sasao, Y Sakuma, K Kudo, N Takeda, T Iida NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 422 (1-3) 75 -78 1999年02月 [査読無し][通常論文]
     
    A new type of fast neutron spectrometer composed of a CH4 proportional counter and a Si semiconductor detector which is called the counter telescope type was constructed for plasma-temperature diagnostics. The counting gas CH4 is used as a converter of neutrons to protons. Since the energy loss of the proton in the converter CH4 can be fairly precisely measured with the proportional counter, the energy resolution for the proton is high, so that a good energy resolution for neutrons is obtained. The energy resolution of the spectrometer itself excluding the energy spread of the D-T 14 MeV neutrons was 1.7% which seems to be the best so far, and the detection efficiency was 1 x 10(-6). If better energy resolution is preferable, even 0.5% is obtained and the efficiency in this case is 4 x 10(-8). (C) 1999 Elsevier Science B.V. All rights reserved.
  • KANEKO J, KATAGIRI M, IKEDA Y, NISHITANI T Nucl. Instrum. and Meth 422 (1/3) 211 -215 1999年 [査読無し][通常論文]
  • KANEKO J, IKEDA Y, NISHITANI T, KATAGIRI M Rev. Sci. Instrum 70 (1, Pt.2) 1100 -1103 1999年 [査読無し][通常論文]
  • KIMURA K, KANEKO J, SHARMA S, ITOH N Nucl. Instrum and Meth 154 (1/4) 318 -324 1999年 [査読無し][通常論文]
  • KIMURA K, KANEKO J, SHARMA S, HONG W, ITOH N Phys. Rev. B 60 (18) 12626 -12634 1999年 [査読無し][通常論文]
  • KIMURA K, HONG W, KANEKO J, ITOH N Nucl. Instrum. and Meth 141 (1/4) 425 -430 1998年 [査読無し][通常論文]
  • Development of Radiation Detectors using Synthetic Diamond Crystals
    Proceedings of the 5th NIRIM International symposium on advanced materials ISAM '98 257 -260 1998年 [査読無し][通常論文]
  • M Isobe, T Nishitani, AV Krasilnikov, J Kaneko, M Sasao FUSION ENGINEERING AND DESIGN 34-35 573 -576 1997年03月 [査読無し][通常論文]
     
    A natural diamond detector (NDD) is one of the candidates for the D-T neutron spectrometer in the International Thermonuclear Experimental Reactor since it has a high energy resolution, a high radiation resistance and a very compact size. The characteristic performance of NDD as a D-T neutron spectrometer was examined at the FNS neutron generator. The NDD indicated the energy resolution of 1.95% to 14.1 MeV neutrons. In order to obtain the information of the triton slowing-down, the NDD was applied to the deuterium discharges of the JT-60U tokamak. By accumulating the data of several shots, the change of the pulse height spectrum suggesting the slowing-down of tritons was observed after neutral beam turn-off. (C) 1997 Elsevier Science S.A.
  • T Iguchi, E Takada, M Nakazawa, J Kaneko, T Nishitani, T Matoba, Y Ikeda FUSION ENGINEERING AND DESIGN 34-35 585 -589 1997年03月 [査読無し][通常論文]
     
    A 14 MeV neutron spectrometer suitable for an ITER-like fusion reactor is conceptually designed on the basis of a recoil proton counter telescope method in oblique scattering geometry. To verify the principle and basic performance of the detector concept, preliminary experiments are made for a prototype detector system, where the detector responses are measured to 14 MeV neutrons produced from an accelerator deuterium-tritium (DT) neutron source and compared with the calculated ones. The comparison results show reasonably good agreement and demonstrate the possibility of energy resolution of 2.5% in full width at half maximum for 14 MeV neutron spectrometry. (C) 1997 Elsevier Science S.A.
  • KRASILNIKOV A V, KANEKO J, ISOBE M, MAEKAWA F, NISHITANI T Rev. Sci. Instrum. 68 (4) 1720 -1724 1997年 [査読無し][通常論文]
  • KANEKO J, KATAGIRI M, IKEDA Y, ARA K, IGUCHI T, NAKAZAWA M Nucl. Instrum. and Meth. 385 (1) 157 -160 1997年 [査読無し][通常論文]
  • KANEKO J, KATAGIRI M Nucl. Instrum. and Meth 383 (2/3) 547 -548 1996年 [査読無し][通常論文]
  • T IGUCHI, J KANEKO, M NAKAZAWA, T MATOBA, T NISHITANI, S YAMAMOTO FUSION ENGINEERING AND DESIGN 28 (1/4) 689 -698 1995年03月 [査読無し][通常論文]
     
    Neutron measurement in fusion experimental reactors is very important for burning plasma diagnostics and control, monitoring of irradiation effects on device components, neutron source characterization for in-situ engineering tests etc. A conceptual design of neutron diagnostic systems for an International Thermonuclear Experimental Reactor (ITER)-like fusion experimental reactor is made, which consists of a neutron yield monitor, a neutron emission profile monitor and a 14 MeV neutron spectrometer. Each of them is based on a unique idea to meet the required performances for full power conditions assumed at ITER operation. The final design results and expected performances of the promising neutron diagnostic systems are presented together with their critical design issues.
  • NEUTRON SPECTROMETERS FOR ITER
    Diagnostics for Experimental Thermonuclear Fusion Reactors, Proceedings of the International Workshop on Diagnostics for ITER, Aug. 28 - Sept. 1 0 1995年 [査読無し][通常論文]

特許

  • 入力関数測定装置
    特許公開2011-64661
  • 小型X線発生装置
    特許公開2009-283169
  • 単結晶シンチレータ
    特願2008-050385
  • 動的腫瘍の放射線治療装置および動的腫瘍の放射線治療プログラムム(PCT/JP2008/052944)
    特願2007-041373
  • 中性子線検出器
    特開2004-184104
  • 高速・高位置分解能型中性子検出用ガスカウンタ計測システム
    特許公開2002-62360

受賞

  • 2008年 日本原子力学会 放射線工学部会 奨励賞
  • 2008年 Non

共同研究・競争的資金等の研究課題

  • 医用原子力
    研究期間 : 2004年
  • Nuclear engineering for radiation therapy and diagnostics
    研究期間 : 2004年
  • 酸化物シンチレータの開発
    研究期間 : 2001年
  • development of oxide scintillators
    研究期間 : 2001年
  • 中性子散乱実験用中性子検出器・中性子光学素子の開発
    研究期間 : 1999年
  • Development of neutron detectors and neutron optics
    研究期間 : 1999年
  • 人工ダイヤモンド放射線検出器の開発
    研究期間 : 1994年
  • Development of synthetic diamond radiation detectors
    研究期間 : 1994年

教育活動情報

主要な担当授業

  • 一般教育演習(フレッシュマンセミナー)
    開講年度 : 2018年
    課程区分 : 学士課程
    開講学部 : 全学
  • 大学院共通授業科目(一般科目):人文社会科学
    開講年度 : 2018年
    課程区分 : 修士課程
    開講学部 : 大学院共通科目
    キーワード : ビジネスプラン、財務分析、マーケティング、企業戦略、PBL
  • 大学院共通授業科目(一般科目):人文社会科学
    開講年度 : 2018年
    課程区分 : 修士課程
    開講学部 : 大学院共通科目
    キーワード : ビジネスシミュレーション、経営戦略、財務、マーケティング、損益分岐点計算、戦略的意思決定
  • Radiation and Quantum Beam Measurement(量子ビーム計測工学E)
    開講年度 : 2018年
    課程区分 : 修士課程
    開講学部 : 工学院
  • 量子ビーム計測工学特論
    開講年度 : 2018年
    課程区分 : 修士課程
    開講学部 : 工学院
    キーワード : 放射線計測、統計、ガス検出器、シンチレーション検出器、半導体検出器、スペクトル測定、中性子計測
  • 大学院共通授業科目(一般科目):人文社会科学
    開講年度 : 2018年
    課程区分 : 修士課程
    開講学部 : 大学院共通科目
    キーワード : アカウンティング、ファイナンス、財務諸表、財務諸表分析、キャッシュフロー、時間価値
  • 大学院共通授業科目(一般科目):複合領域
    開講年度 : 2018年
    課程区分 : 修士課程
    開講学部 : 大学院共通科目
    キーワード : キャリアマネジメント(Career Management)、 研究マネジメント(Research Management)、MOT (Management of Technology)、すべての仕事に必要な基本スキル(Transferable Skills)、イノベーション (Innovation)、マーケティング(Marketing)、知的財産(Intellectual Property)、プレゼンテーション(Presentation)、アントレプレナーシップ(Entrepreneurship)、コンプライアンス(Compliance)、企業における研究開発(Industrial R&D)、リーダーシップ(Leadership)、グローバル人材(Global Human Resource)
  • Radiation and Quantum Beam Measurement(量子ビーム計測工学E)
    開講年度 : 2018年
    課程区分 : 博士後期課程
    開講学部 : 工学院
  • 量子ビーム計測工学特論
    開講年度 : 2018年
    課程区分 : 博士後期課程
    開講学部 : 工学院
    キーワード : 放射線計測、統計、ガス検出器、シンチレーション検出器、半導体検出器、スペクトル測定、中性子計測
  • キャリアマネジメントセミナー
    開講年度 : 2018年
    課程区分 : 博士後期課程
    開講学部 : 生命科学院
    キーワード : キャリアマネジメント(Career Management)、 研究マネジメント(Research Management)、MOT (Management of Technology)、すべての仕事に必要な基本スキル(Transferable Skills)、イノベーション (Innovation)、マーケティング(Marketing)、知的財産(Intellectual Property)、プレゼンテーション(Presentation)、アントレプレナーシップ(Entrepreneurship)、コンプライアンス(Compliance)、企業における研究開発(Industrial R&D)、リーダーシップ(Leadership)、グローバル人材(Global Human Resource)
  • 一般教育演習(フレッシュマンセミナー)
    開講年度 : 2018年
    課程区分 : 学士課程
    開講学部 : 全学教育
    キーワード : ビジネスシミュレーション、経営戦略、財務、マーケティング、損益分岐点計算、戦略的意思決定
  • 原子物理
    開講年度 : 2018年
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 原子、原子核、核反応、放射線、物質との相互作用、放射線防護
  • 一般教育演習(フレッシュマンセミナー)
    開講年度 : 2018年
    課程区分 : 学士課程
    開講学部 : 全学教育
    キーワード : 放射線、放射能、放射線被ばく、放射線医療、原子炉、環境放射能、放射性廃棄物処理・処分、廃炉工学、オープン教材
  • 一般教育演習(フレッシュマンセミナー)
    開講年度 : 2018年
    課程区分 : 学士課程
    開講学部 : 全学教育
    キーワード : 量子ビーム、プラズマ、触媒、ナノ材料

大学運営

学内役職歴

  • 2017年4月1日 - 2019年3月31日 研究戦略室室員
  • 2017年4月1日 - 2019年3月31日 総長補佐
  • 2017年4月1日 - 2021年3月31日 産学・地域協働推進機構副機構長
  • 2019年4月1日 -  研究戦略室室員
  • 2019年4月1日 -  総長補佐

委員歴

  • 2010年   日本原子力学会   標準委員会 原子燃料サイクル専門部会 臨界安全管理分科会 委員   日本原子力学会


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