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Rodriguez, D.; Abbas, K.*; Crochemore, J.-M.*; Koizumi, Mitsuo; Nonneman, S.*; Pedersen, B.*; Rossi, F.; Seya, Michio*; Takahashi, Toon
EPJ Web of Conferences, 239, p.17005_1 - 17005_5, 2020/09
Rodriguez, D.; Koizumi, Mitsuo; Rossi, F.; Seya, Michio; Takahashi, Toon; Bogucarska, T.*; Crochemore, J.-M.*; Pedersen, B.*; Takamine, Jun
Journal of Nuclear Science and Technology, 57(8), p.975 - 988, 2020/08
Times Cited Count：1 Percentile：28.06(Nuclear Science & Technology)
Cf for safeguards verification measurements" [Appl. Radiat. Isot. 148C (2019) 114-125]Rodriguez, D.; Rossi, F.; Takahashi, Toon; Seya, Michio*; Koizumi, Mitsuo
Applied Radiation and Isotopes, 159, P. 109083_1, 2020/05
Times Cited Count：0 Percentile：100(Chemistry, Inorganic & Nuclear)Rossi, F.; Rodriguez, D.; Takahashi, Toon; Seya, Michio; Koizumi, Mitsuo
Proceedings of INMM 60th Annual Meeting (Internet), 7 Pages, 2019/07
Cf for safeguards verification measurementsRodriguez, D.; Rossi, F.; Takahashi, Toon; Seya, Michio; Koizumi, Mitsuo
Applied Radiation and Isotopes, 148, p.114 - 125, 2019/06
Times Cited Count：3 Percentile：24.33(Chemistry, Inorganic & Nuclear)Rossi, F.; Rodriguez, D.; Takahashi, Toon; Seya, Michio; Koizumi, Mitsuo
Nihon Kaku Busshitsu Kanri Gakkai Dai-39-Kai Nenji Taikai Rombunshu (CD-ROM), 3 Pages, 2018/11
This paper (presentation) reports on the design study for seeking compactness of moderator (and reflector) structure for the Delayed Gamma-ray Spectroscopy Non Destructive Assay system to be applied for verification of fissile isotopic (Pu-239, Pu-241 and U-235) composition ratio in High Radioactive Nuclear Material sample such as dissolved solution of reprocessing facility. We first investigated advantages and disadvantages of using different compact neutron sources as DT and DD neutron generators. This led us to the conclusion of using DD sources to achieve a compact (and practical) NDA system. Based on MCNP simulations, with the use of a DD neutron generator, a preliminary optimization study was performed and will be shown here.
Rodriguez, D.; Rossi, F.; Takahashi, Toon; Seya, Michio; Koizumi, Mitsuo
Nihon Kaku Busshitsu Kanri Gakkai Dai-39-Kai Nenji Taikai Rombunshu (Internet), 2 Pages, 2018/11
Safeguards verification of high-radioactivity nuclear material (HRNM) solution samples is performed by HKED analysis for Pu/U element masses and time-consuming destructive analysis for isotopic compositions. To reduce the composition verification time, we have been collaborating with the EC-JRC to develop Delayed Gamma-ray Spectroscopy (DGS), which utilizes fission product 
rays with 
3 MeV energy, above the intense passive background. We present the DGS Phase-I development summary and the Phase-II development plan. Additionally, we report about the ray pipe monitoring demonstration we performed at TRP and our process monitoring concept that includes GR pipe monitoring and self-interrogation DGS technique in reprocessing facilities.
Rodriguez, D.; Rossi, F.; Takahashi, Toon; Seya, Michio; Koizumi, Mitsuo; Crochemore, J. M.*; Varasano, G.*; Bogucarska, T.*; Abbas, K.*; Pedersen, B.*
Proceedings of INMM 59th Annual Meeting (Internet), 7 Pages, 2018/07
Takahashi, Toon; Koizumi, Mitsuo; Rodriguez, D.; Rossi, F.; Takamine, Jun; Seya, Michio; Paradela, C.*; Heyse, J.*; Schillebeeckx, P.*; Pedersen, B.*; et al.
no journal, ,
Delayed Gamma-ray Spectroscopy (DGS) has been developed as one of the non-destructive assay using active neutron for nuclear non-proliferation and nuclear security in the collaboration research between Japan Atomic Energy Agency and Joint Research Center of European Commission. The differences of fission-product (FP) yield distributions are depending on the fissile nuclide (e.g. 
U, 
Pu, and 
Pu). Therefore, ratios of fissile materials can be deduced by analyzing spectra of delayed gamma-rays which are emitted from radioactive decays of unstable FPs produced by irradiating neutrons and causing induced fission. We are developing an analytical method focusing on high energy delayed gamma-rays above 3 MeV from FPs with relatively short half-life (seconds to several minutes). The demonstration plan of DGS will be presented.
Koizumi, Mitsuo; Omer, M.; Takahashi, Toon; Seya, Michio; Hajima, Ryoichi; Shizuma, Toshiyuki; Hashimoto, Satoshi*; Amano, So*; Miyamoto, Shuji*
no journal, ,
JAEA, QST, and University of Hyogo are developing a nuclear material detection technique that utilizes a measurement method of nuclear resonance fluorescence gamma-ray scattering induced by laser Compton scattering gamma-ray beams, under the subsidiary for "promotion of strengthening nuclear security or the like" of MEXT. So far, experimental apparatus, a laser system, gamma-ray detectors, data acquisition systems, and so on, are prepared for a demonstration experiment to be performed at NEW SBARU facility of University of Hyogo. An imitated nuclear material sample hidden in a shield will be placed on an automatic stage. This presentation overview the purpose of this program, preparation status, plan of demonstration experiments and a workshop.
Takahashi, Toon; Ito, Fumiaki*; Koizumi, Mitsuo; Suzuki, Satoshi*; Yogo, Akifumi*; Arikawa, Yasunobu*; Abe, Yuki*; Hori, Junichi*; Sano, Tadafumi*; Lee, J.; et al.
no journal, ,
Some nondestructive assay (NDA) methods for validation of highly radioactive nuclear material have been developed under the subsidiary for nuclear security promotion of MEXT. Nuclear Resonance Transmission Analysis (NRTA) is able to measure the density of each isotope of fissile and quite useful for analysis of solid samples like fuel debris. However, it is not easy to install due to a large Time-of-Flight (TOF) system which is required for the precise measurement. So, we have proposed a NRTA combined with Laser Driven Neutron Source (LDNS). TOF system would be shortened less than 5 m because of extremely short pulse width of LDNS. A conceptual design of LDNS-NRTA will be presented.
Ito, Fumiaki*; Takahashi, Toon; Suzuki, Satoshi*; Lee, J.; Koizumi, Mitsuo; Yogo, Akifumi*; Arikawa, Yasunobu*; Abe, Yuki*; Nishimura, Hiroaki*; Hori, Junichi*; et al.
no journal, ,
Under the subsidiary for "promotion of strengthening nuclear security or the like" of MEXT, development of nuclear non-proliferation technologies are in progress. One of the research programs is development of laser driven neutron source for neutron resonance transmission analysis (NRTA). Status of development of a neutron detector and an analyzing method are reported.
Ito, Fumiaki*; Koizumi, Mitsuo; Takahashi, Toon; Suzuki, Satoshi*; Lee, J.
no journal, ,
Neutron Resonance Transmission Analysis (NRTA) is one of the active neutron NDA techniques being developed under the subsidiary for "promotion of strengthening nuclear security or the like" of MEXT. A short pulse neutron source is required to apply NRTA method to an accurate measurement of nuclear materials. A laser driven neutron source (LDNS) is considered to be such a neutron source. A study of applicability of LDNS to NRTA, and neutron detector development are in progress. The Monte Carlo simulation code PHITS was used for designing a neutron generation part, a neutron flight path, and a neutron detector system.
Rossi, F.; Rodriguez, D.; Seya, Michio; Takahashi, Toon; Koizumi, Mitsuo; Abbas, K.*; Crochemore, J.-M.*; Pedersen, B.*; Bogucarska, T.*; Varasano, G.*; et al.
no journal, ,
Suzuki, Satoshi*; Kimura, Yoshiki; Koizumi, Mitsuo; Takahashi, Toon; Tomikawa, Hirofumi
no journal, ,
no abstracts in English
Koizumi, Mitsuo; Takahashi, Toon; Tomikawa, Hirofumi; Kimura, Yoshiki
no journal, ,
no abstracts in English
Lee, J.; Ito, Fumiaki*; Koizumi, Mitsuo; Takahashi, Toon; Suzuki, Satoshi*
no journal, ,
no abstracts in English
Takahashi, Toon; Koizumi, Mitsuo; Tomikawa, Hirofumi; Kimura, Yoshiki; Sato, Yuki; Terasaka, Yuta; Torii, Tatsuo; Yamanishi, Hirokuni*; Wakabayashi, Genichiro*
no journal, ,
no abstracts in English
Ito, Fumiaki*; Lee, J.; Koizumi, Mitsuo; Takahashi, Toon; Suzuki, Satoshi*; Hori, Junichi*
no journal, ,
no abstracts in English
Lee, J.; Ito, Fumiaki*; Koizumi, Mitsuo; Takahashi, Toon; Suzuki, Satoshi*
no journal, ,
no abstracts in English
Ito, Fumiaki*; Lee, J.; Koizumi, Mitsuo; Takahashi, Toon; Suzuki, Satoshi*; Hori, Junichi*
no journal, ,
no abstracts in English
