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scintillation detection system for simple non-destructive measurements (Contract research); FY2023 Nuclear Energy Science & Technology and Human Resource Development ProjectCollaborative Laboratories for Advanced Decommissioning Science; Tohoku University*
JAEA-Review 2025-046, 70 Pages, 2026/01
JAEA-Review-2025-046.pdf:5.46MB
The Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency (JAEA), had been conducting the Nuclear Energy Science & Technology and Human Resource Development Project (hereafter referred to "the Project") in FY2023. The Project aims to contribute to solving problems in the nuclear energy field represented by the decommissioning of the Fukushima Daiichi Nuclear Power Station (1F), Tokyo Electric Power Company Holdings, Inc. (TEPCO). For this purpose, intelligence was collected from all over the world, and basic research and human resource development were promoted by closely integrating/collaborating knowledge and experiences in various fields beyond the barrier of conventional organizations and research fields. The sponsor of the Project was moved from the Ministry of Education, Culture, Sports, Science and Technology to JAEA since the newly adopted proposals in FY2018. On this occasion, JAEA constructed a new research system where JAEA-academia collaboration is reinforced and medium-to-long term research/development and human resource development contributing to the decommissioning are stably and consecutively implemented. Among the adopted proposals in FY2023, this report summarizes the research results of the "Development of an innovative n/ scintillation detection system for simple non-destructive measurements" conducted in FY2023. At 1F, removal of fuel debris from the primary containment vessel (PCV) is scheduled for FY2023, and a phased expansion of the removal scale is being considered in the future. As a solution to the above problem, this study will develop an innovative scintillation radiation detection system for screening and continuous monitoring during target sample removal. To develop a remote measurement system that contributes to in-vessel investigations for decommissioning of nuclear facilities such as 1F. More specifically, we will develop vertically integrated research into the following elemental technologies: (1) development of innovative high-performance scintillation materials for thermal neutron / gamma-ray discrimination (Tohoku University), (2) downsizing of censer and signal processing system (the University of Tokyo), (3) construction and characterization of various radiation fields (National Institute of Advanced Industrial Science and Technology), and (4) development of a simple non-destructive measurement system and hot cell demonstration test (JAEA). By vertically integrating elemental technologies, R&D on each research item planned in FY2023 was conducted to develop a detector that can discriminate gamma-ray and neutron radiation in environments exceeding 10 Gy/h and simultaneously identify the dose rate and nuclide of each in PCVs and in each acceptance cell.
Hironaka, Kota; Lee, J.; Koizumi, Mitsuo; Ito, Fumiaki*; Hori, Junichi*; Terada, Kazushi*; Sano, Tadafumi*
Nuclear Instruments and Methods in Physics Research A, 1054, p.168467_1 - 168467_5, 2023/09
Times Cited Count：4 Percentile：55.39(Instruments & Instrumentation)-ray discrimination based on the property and thickness controls of scintillators using Li glass and LiCAF(Ce) in a -ray fieldKaburagi, Masaaki; Shimazoe, Kenji*; Terasaka, Yuta; Tomita, Hideki*; Yoshihashi, Sachiko*; Yamazaki, Atsushi*; Uritani, Akira*; Takahashi, Hiroyuki*
Nuclear Instruments and Methods in Physics Research A, 1046, p.167636_1 - 167636_8, 2023/01
Times Cited Count：8 Percentile：81.90(Instruments & Instrumentation)We focus on the thickness and property controls of inorganic scintillators used for thermal neutron detection in intense -ray fields without considering pulse shape discrimination techniques. GS20
(a lithium glass) and LiCaAlF
:Ce(LiCAF:Ce) cintillators with thicknesses of 0.5 and 1.0 mm, respectively, have been employed. Pulse signals generated by photomultiplier tubes, to which the scintillators were coupled, were inserted into a digital pulse processing unit with 1 Gsps, and the areas of waveforms were integrated for 360 ns. In a 
Co -ray field, the neutron detection for GS20 with a 0.5-mm thickness was possible at dose rates of up to 0.919 Gy/h; however, for LiCAF:Ce, neutron detection was possible at 0.473 Gy/h, and it failed at 0.709 Gy/h. Threfore, in a Co -ray field, the neutron/-ray discrimination of GS20 was better than that of LiCAF:Ce due to its better energy resolution and higher detection efficiency.
Yamamoto, Kazami; Hatakeyama, Shuichiro; Otsu, Satoru*; Matsumoto, Tetsuro*; Yoshimoto, Masahiro
Proceedings of 18th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.494 - 498, 2021/10
J-PARC 3 GeV Rapid Cycling Synchrotron (RCS) provides more than 700 kW proton beam to the neutron target. In order to investigate the influence of the radiation, we intend to evaluate the radiations such as the neutron and gamma-rays, which are generated due to the proton beam loss. If the amount of beam loss is excessive, it becomes difficult to identify the individual neutron and gamma ray. Therefore, we investigated the signal rate of the extraction point of RCS. Preliminary result indicated that we can enough distinguish the neutron and gamma-ray by the liquid scintillator.
Sato, Tatsuhiko; Satoh, Daiki; Endo, Akira; Yamaguchi, Yasuhiro
Journal of Nuclear Science and Technology, 42(9), p.768 - 778, 2005/09
Times Cited Count：17 Percentile：71.84(Nuclear Science & Technology)A new inventive radiation monitor, designated to DARWIN (Dose Assessment system applicable to various Radiations with WIde energy raNges), has been developed for monitoring doses at workspaces of high energy accelerator facilities and on ground. Characteristics of DARWIN were studied by both calculation and experiment. The calculated results indicate that DARWIN gives reasonable estimations of doses at most radiation fields. It was found from the experiment that DARWIN has an excellent property of measuring doses from all particles that significantly contribute to the background dose - photon, muon and neutron with wide energy ranges.
-ray detectionYamasoto, Kotaro; Tsutsumi, Masahiro; Oishi, Tetsuya*; Yoshizawa, Michio; Yoshida, Makoto
Nuclear Instruments and Methods in Physics Research A, 550(3), p.609 - 615, 2005/09
Times Cited Count：5 Percentile：39.97(Instruments & Instrumentation)A phoswich detector composed of a thin plate CsI(Tl) scintillator and a plastic scintillator (BC-400) has been designed and evaluated to improve the sensitivity in the low-energy region of large-area plastic scintillation detector. Applicability of the CsI(Tl)/Plastic phoswich detector was examined on radioactivity measurement of massive and large-area materials. The rise-time discrimination technique was applied in order to further improve the minimum detectable activity in the low-energy region. On the basis of the estimation of minimum detectable activity, it was made clear that the energy range of large-area plastic scintillation detector can be expanded down to a few tens of keV by adding a thin plate CsI(Tl) scintillator.
ray by a neutron detector comprising a superconducting tunnel junction on a single crystal of Li
B
O
Nakamura, Tatsuya; Katagiri, Masaki; Soyama, Kazuhiko; Ukibe, Masahiro*; Ikeuchi, Takashi*; Okubo, Masataka*
Nuclear Instruments and Methods in Physics Research A, 529(1-3), p.402 - 404, 2004/08
Times Cited Count：8 Percentile：47.21(Instruments & Instrumentation)We evaluated the neutron--rays discrimination of the neutron detector comprising a superconducting tunnel junction (STJ) on the single crystal of LiBO. The neutron detector was irradiated with X-rays, -rays and neutrons, and the signal pulses were analyzed including pulse height distributions and rise times. It was found that the most of the signal pulses for the neutron-events exhibited slower rise times than those for X-rays and -rays. This indicated the capability of neutron--rays discrimination of the detector using the differences in the decay time of the signal current.
C]methionine translocation in barley in relation to mugineic acid phytosiderophore biosynthesisBughio, N.*; Nakanishi, Hiromi*; Kiyomiya, Shoichiro*; Matsuhashi, Shimpei; Ishioka, Noriko; Watanabe, Satoshi; Uchida, Hiroshi*; Tsuji, Atsunori*; Osa, Akihiko; Kume, Tamikazu; et al.
Planta, 213(5), p.708 - 715, 2001/09
Times Cited Count：17 Percentile：36.93(Plant Sciences)[C]Methionine ([C]Met) was supplied through barley roots and the C signal was follwoed using a real-time imaging system (PETIS), with subsequent development of autoradiographic images of the whole plant. In all cases, [C]Met was first translocated to the discrimination center, and this part was strongly labeled. Met absorbed by roots of the plants was subsequently translocated to other parts of the plant. In Fe-deficient (-Fe) barley plants, a drastic reduction in [C]Met translocation from the roots to the shoot was observed, while a greater amount of C was found in the leaves of Fe-sufficient or Met-pretreated -Fe plants. Treatment of -Fe plants with amiooxyacetic acid increased the translocation of [C]Met to the shoot. The retention of exogenously supplied [C]Met in the roots of -Fe barley indicates that the Met is used in the biosynthesis of mugineic acid (MA) in barley roots. This and the absence of Met movement from shoots to the roots suggest that the MA phytosiderophores precursor Met originates in the roots of plants.
Matsubayashi, Masahito; Hibiki, Takashi*; Mishima, Kaichiro*; Yoshii, Koji*; Okamoto, Koji*
Nuclear Instruments and Methods in Physics Research A, 463(1-2), p.324 - 330, 2001/05
Times Cited Count：17 Percentile：73.66(Instruments & Instrumentation)no abstracts in English
Abe, Ken*; Saito, Kiwamu*; To, Kentaro; Kojima, Takuji; Sakai, Takuro
JAERI-Review 99-025, TIARA Annual Report 1998, p.103 - 105, 1999/10
no abstracts in English
Usuda, Shigekazu; Yasuda, Kenichiro; Sakurai, Satoshi
Journal of Alloys and Compounds, 271-273, p.58 - 61, 1998/00
Times Cited Count：10 Percentile：56.27(Chemistry, Physical)no abstracts in English
Abe, Ken*; Kojima, Takuji; ; ; ; ; Sakai, Takuro;
Radiation Detectors and Their Uses, p.323 - 328, 1998/00
no abstracts in English
-,
()-rays and neutronsUsuda, Shigekazu; Sakurai, Satoshi;
Nuclear Instruments and Methods in Physics Research A, 388(1-2), p.193 - 198, 1997/00
Times Cited Count：39 Percentile：91.51(Instruments & Instrumentation)no abstracts in English
and () countingUsuda, Shigekazu; Abe, Hitoshi
Journal of Nuclear Science and Technology, 31(1), p.73 - 79, 1994/01
Times Cited Count：15 Percentile：76.38(Nuclear Science & Technology)no abstracts in English
, and rays with phoswich detectorsUsuda, Shigekazu; Abe, Hitoshi; Mihara, Akira
Journal of Alloys and Compounds, 213-214, p.437 - 439, 1994/00
Times Cited Count：13 Percentile：68.06(Chemistry, Physical)no abstracts in English
, and raysUsuda, Shigekazu; Abe, Hitoshi; Mihara, Akira
Nuclear Instruments and Methods in Physics Research A, 340, p.540 - 545, 1994/00
Times Cited Count：27 Percentile：88.18(Instruments & Instrumentation)no abstracts in English
and () countingUsuda, Shigekazu
Journal of Nuclear Science and Technology, 29(9), p.927 - 929, 1992/09
no abstracts in English
and () counting using a CsI(T1) scintillatorUsuda, Shigekazu; Abe, Hitoshi
Nuclear Instruments and Methods in Physics Research A, 321, p.242 - 246, 1992/00
Times Cited Count：17 Percentile：80.66(Instruments & Instrumentation)no abstracts in English
and () rays from solid and solution sources with several solid scintillatorsUsuda, Shigekazu; Mihara, Akira; Abe, Hitoshi
Nuclear Instruments and Methods in Physics Research A, 321, p.247 - 253, 1992/00
Times Cited Count：23 Percentile：86.67(Instruments & Instrumentation)no abstracts in English
; ; ; ;
Nuclear Instruments and Methods in Physics Research A, 256, p.333 - 338, 1987/00
Times Cited Count：21 Percentile：87.43(Instruments & Instrumentation)no abstracts in English
