Segawa, Mariko; Nishinaka, Ichiro*; Toh, Yosuke; Maeda, Makoto
Journal of Radioanalytical and Nuclear Chemistry, 326(1), p.773 - 778, 2020/10
Shinohara, Takenao; Kai, Tetsuya; Oikawa, Kenichi; Nakatani, Takeshi; Segawa, Mariko; Hiroi, Kosuke; Su, Y.; Oi, Motoki; Harada, Masahide; Iikura, Hiroshi; et al.
Review of Scientific Instruments, 91(4), p.043302_1 - 043302_20, 2020/04
Kai, Tetsuya; Hiroi, Kosuke; Su, Y.; Segawa, Mariko; Shinohara, Takenao; Matsumoto, Yoshihiro*; Parker, J. D.*; Hayashida, Hirotoshi*; Oikawa, Kenichi
Materials Research Proceedings, Vol.15, p.149 - 153, 2020/02
Rovira, G.*; Katabuchi, Tatsuya*; Tosaka, Kenichi*; Matsuura, Shota*; Terada, Kazushi*; Iwamoto, Osamu; Kimura, Atsushi; Nakamura, Shoji; Iwamoto, Nobuyuki; Segawa, Mariko; et al.
Journal of Nuclear Science and Technology, 57(1), p.24 - 39, 2020/01
Kai, Tetsuya; Sato, Setsuo*; Hiroi, Kosuke; Su, Y.; Segawa, Mariko; Parker, J. D.*; Matsumoto, Yoshihiro*; Hayashida, Hirotoshi*; Shinohara, Takenao; Oikawa, Kenichi; et al.
Physica B; Condensed Matter, 551, p.496 - 500, 2018/12
Segawa, Mariko; Oikawa, Kenichi; Kai, Tetsuya; Shinohara, Takenao; Hayashida, Hirotoshi*; Matsumoto, Yoshihiro*; Parker, J. D.*; Nakatani, Takeshi; Hiroi, Kosuke; Su, Y.; et al.
JPS Conference Proceedings (Internet), 22, p.011028_1 - 011028_8, 2018/11
Kai, Tetsuya; Hiroi, Kosuke; Su, Y.; Shinohara, Takenao; Parker, J. D.*; Matsumoto, Yoshihiro*; Hayashida, Hirotoshi*; Segawa, Mariko; Nakatani, Takeshi; Oikawa, Kenichi; et al.
Physics Procedia, 88, p.306 - 313, 2017/06
Segawa, Mariko; Oi, Motoki; Kai, Tetsuya; Shinohara, Takenao; Sato, Hirotaka*; Kureta, Masatoshi
JPS Conference Proceedings (Internet), 8, p.036006_1 - 036006_6, 2015/09
Segawa, Mariko; Oi, Motoki; Kai, Tetsuya; Shinohara, Takenao; Kureta, Masatoshi; Sakamoto, Kensaku; Imaki, Tadashi*
Nuclear Instruments and Methods in Physics Research A, 769, p.97 - 104, 2015/01
Kureta, Masatoshi; Segawa, Mariko
Bunseki, 2014(6), p.283 - 289, 2014/06
The neutron visual sensing technology is a one of the visualization and measurement technology using the neutron beam. The technology visualizes the inside information on composite materials or machine parts, and also measures the significant physical quantities by analyzing the recorded visual image-data. In this paper, followings are introduced; (1) fundamentals, (2) applications, (3) leading-edge technology for the pulsed neutron source J-PARC, and (4) know-how on design and development for radiation use equipment.
Segawa, Mariko; Toh, Yosuke; Harada, Hideo; Kitatani, Fumito; Koizumi, Mitsuo; Fukahori, Tokio; Oshima, Masumi*; Iwamoto, Nobuyuki; Iwamoto, Osamu; Hatsukawa, Yuichi; et al.
AIP Conference Proceedings 1594, p.339 - 344, 2014/05
Oi, Motoki; Teshigawara, Makoto; Kai, Tetsuya; Harada, Masahide; Maekawa, Fujio; Futakawa, Masatoshi; Hashimoto, Eiko*; Segawa, Mariko; Kureta, Masatoshi; Tremsin, A.*; et al.
Physics Procedia, 43, p.337 - 342, 2013/04
The Japan Spallation Neutron Source (JSNS) at the Japan Proton Accelerator Research Complex (J-PARC) had been developed as a 1-MW spallation neutron source. A Au-In-Cd alloy has been proposed as a new decoupler material. Recently, we successfully produced the ternary Au-In-Cd alloy. The alloy composition is 74.9 at% Au, 0.5 at% In, and 24.6 at% Cd. We used the pulsed neutron imaging techniques to measure the elements in the Au-In-Cd alloy. Both a time gated camera system and a multi-channel plate (MCP) detector were used as detectors. Measurement was performed at BL10 in the JSNS. A Au-In-Cd specimen, In foil and two Au foils are used as a sample. As a results, we could obtain distribution of Au, In and Cd in the Au-In-Cd specimens distinctly.
Kin, Tadahiro*; Nagai, Yasuki; Iwamoto, Nobuyuki; Minato, Futoshi; Iwamoto, Osamu; Hatsukawa, Yuichi; Segawa, Mariko; Harada, Hideo; Konno, Chikara; Ochiai, Kentaro; et al.
Journal of the Physical Society of Japan, 82(3), p.034201_1 - 034201_8, 2013/03
We have measured the activation cross sections producing Cu and Cu, promising medical radioisotopes for molecular imaging and radioimmunotherapy, by bombarding a natural zinc sample with 14 MeV neutrons. We estimated the production yields of Cu and Cu by fast neutrons from C(d,n) with 40 MeV 5 mA deuterons. The calculated Cu yield is 1.8 TBq (175 g Zn) for 12 h of irradiation; the yields of Cu by Zn(n,p)Cu and Zn(n,x)Cu were 249 GBq (184 g Zn) and 287 GBq (186 g Zn) at the end of 2 days of irradiation, respectively. From the results, we proposed a new route to produce Cu with very little radionuclide impurity via the Zn(n,x)Cu reaction, and showed the Zn(n,p)Cu reaction to be a promising route to produce Cu.
Kureta, Masatoshi; Segawa, Mariko
Jidosha Gijutsukai Shimpojiumu Tekisuto, No.9-11, p.24 - 29, 2012/01
The neutron imaging technique is a one of the unique and advanced non-destructive visualization and measurement techniques. In this symposium, the principle, its application and hot information about the puled neutron imaging by using J-PARC are presented. Its applications to a car engine and a differential are introduced. High-frame-rate imaging, 3D and 4D CT imaging, velocimetry by the PTV method and advanced pulsed neutron imaging are shown as the technology catalog.
Segawa, Mariko; Kai, Tetsuya; Sakai, Takuro; Oi, Motoki; Kureta, Masatoshi
Nuclear Instruments and Methods in Physics Research A, 697, p.77 - 83, 2012/01
Miyamura, Hiroko; Kureta, Masatoshi; Segawa, Mariko; Kubo, Jun*; Saito, Takafumi*; Suzuki, Yoshio; Takemiya, Hiroshi
Visualization of Mechanical Processes (Internet), 1(3), 8 Pages, 2011/10
The use of high frame rate neutron radiography has been proposed as a method for recording images of oil in a running car engine. However, it is difficult to capture the behavior of oil from such images, because the images are dark and blurry. Therefore, we attempt to overcome this problem using a multi-scale image processing technique, in which the oil regions are classified based on scale. This method can be used to focus attention on objects with a particular scale. In addition, we propose a technique by which to capture the time-dependent behavior of oil using spatio-temporal image analysis. Using these techniques, the region of interest can be determined and observed carefully.
Kai, Tetsuya; Segawa, Mariko; Oi, Motoki; Hashimoto, Eiko; Shinohara, Takenao; Harada, Masahide; Maekawa, Fujio; Oikawa, Kenichi; Sakai, Takuro; Matsubayashi, Masahito; et al.
Nuclear Instruments and Methods in Physics Research A, 651(1), p.126 - 130, 2011/09
The neutron resonance absorption imaging technique with a high-speed video camera was successfully demonstrated at the beam line NOBORU, J-PARC. We obtained a set of energy dependent images having enhanced contrast of sample foils around the resonance absorption energies of cobalt (132 eV), cadmium (28 eV), tantalum (4.3 and 10 eV), gold (4.9 eV) and indium (1.5 eV). The capability of this technique is discussed taking into account an absolute peak value and width of a resonance cross section, pulse width of neutron and quantity of sample material. The minimum quantities to perform the neutron absorption imaging with this technique are shown for most of elements.
Hatsukawa, Yuichi; Nagai, Yasuki; Kin, Tadahiro; Segawa, Mariko; Harada, Hideo; Iwamoto, Osamu; Iwamoto, Nobuyuki; Ochiai, Kentaro; Takakura, Kosuke; Konno, Chikara; et al.
Proceedings in Radiochemistry, 1(1), p.327 - 329, 2011/09
Authors proposed a new route to produce Mo by the Mo(,2)Mo reaction, which has some characteristic features. Such as the reaction cross section is large, about 1.5 barn at 12 17 MeV, which is 10 times larger than the thermal-neutron capture cross section of Mo. Second, the cross sections of the (,), (,), and (,) reactions are less than a few mb at = 14 MeV. Third, a large amount of Mo target materials can be used, compared to that for proton beam irradiation on Mo. Fourth, intense neutrons with energy of 12-17 MeV are already available. In the present work we have measured all -rays emitted from activities produced by bombarding a natural Mo target with neutrons from the D(H,)He reaction at Fusion Neutronics Source Facility (FNS) at Japan Atomic Energy Agency (JAEA) to study characteristic features mentioned above more in detail. The neutron flux was about 10n/cms. The experimental results at FNS will be discussed in the conference.
Goto, Jun*; Harada, Hideo; Kitatani, Fumito; Nagai, Yasuki; Oshima, Masumi; Segawa, Mariko; Toh, Yosuke
Journal of the Korean Physical Society, 59(2), p.1585 - 1588, 2011/08
A 4 LaBr(Ce) spectrometer was designed for the measurements of neutron capture cross sections using a prompt -ray spectroscopic method with a time-of-flight technique. An optimum configuration for the 4 LaBr(Ce) spectrometer was adopted from four possible configurations based on comparison of simulated performance and cost of construction. Further simulations were performed to demonstrate performance of the 4 LaBr(Ce) spectrometer.
Kureta, Masatoshi; Segawa, Mariko; Takamine, Jun
Kashika Joho Gakkai-Shi, 31(122), p.116 - 121, 2011/07
In this manuscript, the fundamentals and merits of neutron visual sensing techniques, high-speed consecutive visual sensing technique, high-speed-scanning dynamic 3D visualization technique, multi-beam 3D velocimetry technique and energy-selective neutron imaging technique are summarized. These techniques have been developed mainly for the R&D of the nuclear energy system using the high-flux research reactors, JRR-3 and JRR-4, and a high-intensity pulsed neutron source, J-PARC. Very unique visualization and measurement were successfully carried out by these neutron visual sensing techniques. An energy-selective neutron imaging is extremely unique and newly developed visualization and measurement technique.