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Tanigawa, Masafumi; Mukai, Yasunobu; Tobita, Hiroshi; Kurata, Noritaka*; Kobayashi, Nozomi*; Takase, Misao*; Makino, Risa; Ozu, Akira; Nakamura, Hironobu; Kurita, Tsutomu; et al.
56th Annual Meeting of the Institute of Nuclear Materials Management (INMM 2015), Vol.1, p.693 - 701, 2016/00
no abstracts in English
Ozu, Akira; Takase, Misao*; Haruyama, Mitsuo; Kurata, Noritaka*; Kobayashi, Nozomi*; Kureta, Masatoshi; Nakamura, Tatsuya; To, Kentaro; Sakasai, Kaoru; Suzuki, Hiroyuki; et al.
Nuclear Instruments and Methods in Physics Research A, 798, p.62 - 69, 2015/10
Times Cited Count：2 Percentile：17.57(Instruments & Instrumentation)The light transport properties of scintillator light inside alternative He-3 neutron detector modules using scintillator sheets have been investigated by a ray-tracing simulation code. The detector module consists of a light-reflecting tube, a thin rectangular ceramic scintillator sheet laminated on a glass plate, and two photo-multiplier tubes (PMTs) mounted at both ends of the detector tube. The light induced on the surface of the scintillator sheet via nuclear interaction between the scintillator and neutrons are detected by the two PMTs. The light output of various detector modules in which the scintillator sheets are installed with several different arrangements were examined and evaluated in comparison with experimental results. The results derived from the simulation reveal that the light transport property is strongly dependent on the arrangement of the scintillator sheet inside the tube and the shape of the tube.
Ozu, Akira; Takase, Misao*; Kurata, Noritaka*; Kobayashi, Nozomi*; Tobita, Hiroshi; Haruyama, Mitsuo; Kureta, Masatoshi; Nakamura, Tatsuya; Suzuki, Hiroyuki; To, Kentaro; et al.
Proceedings of 2014 IEEE Nuclear Science Symposium and Medical Imaging Conference; 21st International Symposium on Room-Temperature Semiconductor X-ray and 
-ray detectors (NSS/MIC 2014), 5 Pages, 2014/00
In Japan Atomic Energy Agency, the helium-3 alternative neutron detector using ceramic scintillators for nuclear safeguards is under development with the support of the government. The alternative detector module consists of four components: an aluminum regular square tube, a light reflecting foil put on the inner surface of the square tube, a rectangular scintillator sheet sintered on a glass plate, and two PMTs provided at both ends of the tube. The scintillator sheet is fit on the diagonal inside the square tube. The light transport property of scintillator lights inside the tube influences on the fundamental performance of the alternative detector. Therefore, the properties of the lights emitted on the surface of the scintillator sheet and scintillation lights passing through the glass plate to the PMTs in several arrangements of the scintillator in the tubes were investigated with a ray-tracing simulation. The results are described in comparison with the experimental results.
Ozu, Akira; Kureta, Masatoshi; Haruyama, Mitsuo; Takase, Misao; Kurata, Noritaka; Kobayashi, Nozomi; Soyama, Kazuhiko; Nakamura, Tatsuya; Sakasai, Kaoru; To, Kentaro; et al.
Kaku Busshitsu Kanri Gakkai (INMM) Nihon Shibu Dai-34-Kai Nenji Taikai Rombunshu (Internet), 9 Pages, 2013/10
no abstracts in English
Kureta, Masatoshi; Ozu, Akira; Haruyama, Mitsuo; Takase, Misao; Kurata, Noritaka; Kobayashi, Nozomi; Soyama, Kazuhiko; Nakamura, Tatsuya; Nakamura, Hironobu; Seya, Michio
Proceedings of INMM 54th Annual Meeting (CD-ROM), 8 Pages, 2013/07
Against the background of the serious shortage of He-3 gas, the ceramic scintillator neutron detectors have been developed for a safeguards-specific alternative to He-3 for neutron detection with support of Japan government (MEXT). In this paper, the evaluation of optical guide property on ceramic scintillator detectors and design of the demonstrator named Alternative Plutonium Canister Assay system (APCA).
Ozu, Akira; Nakamura, Tatsuya; Takase, Misao; Kurata, Noritaka; Haruyama, Mitsuo; Kureta, Masatoshi; Soyama, Kazuhiko; Seya, Michio
Proceedings of 2013 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC), 4 Pages, 2013/00
Alternative He-3 neutron detectors using inorganic solid (ZnS:Ag/10B
O
) scintillators for nuclear safeguards have been developed in Japan Atomic Energy Agency (JAEA). The detector module is made mainly of three components: an aluminum regular square tube (32 mm 
32 mm 300 mm), a rectangular scintillator sheet (39 mm 250 mm) and two PMTs. The scintillator sheet is fit on the diagonal inside the square tube, while the two PMTs are installed at both ends of the tube. At present, the detection efficiency of around 50% of that of the He-3 gas detector has been already achieved. The ray sensitivity of 
510
is also obtained. The fundamental performance of the alternative detector is strongly dependent on the optical guide property of scintillation lights inside of the tube. The transport properties of the scintillation lights detected with the PMTs was evaluated by a ray-tracing simulation. The results are discussed in comparison with the experimental results.
Ozu, Akira; Kureta, Masatoshi; Seya, Michio; Haruyama, Mitsuo; Takase, Misao; Kurata, Noritaka; Soyama, Kazuhiko; Nakamura, Tatsuya
no journal, ,
Recently, the development of neutron detectors without He-3 gas has become active rapidly because of shortage of He-3 gas on a global scale. Although various types of the alternatives to He-3 gas detectors have been developed so far, they have not still been superior to the He-3 gas detectors and insufficient from the point of view of sensitivity, efficiency and persistence. We therefore have has newly started an R&D project of inorganic solid scintillation neutron detectors using B-10 and Li-6 combined with ZnS, which are expected to be equal to He-3 gas detectors in performances. The reaction probability between neutron and the scintillators provided with a nuclear fuel assembly assay system was calculated by using Monte Carlo simulation code, MVP. Those results evaluated from the technical standpoint are presented.
Ozu, Akira; Kureta, Masatoshi; Seya, Michio; Haruyama, Mitsuo; Takase, Misao; Kurata, Noritaka; Soyama, Kazuhiko; Nakamura, Tatsuya
no journal, ,
no abstracts in English
Ozu, Akira; Nakamura, Tatsuya; Takase, Misao; Kurata, Noritaka; Haruyama, Mitsuo; Soyama, Kazuhiko; Kureta, Masatoshi; Seya, Michio
no journal, ,
no abstracts in English
Nakamura, Tatsuya; Ozu, Akira; To, Kentaro; Ebine, Masumi; Birumachi, Atsushi; Suzuki, Hiroyuki; Honda, Katsunori; Takase, Misao; Kurata, Noritaka; Haruyama, Mitsuo; et al.
no journal, ,
no abstracts in English
Ozu, Akira; Nakamura, Tatsuya; Takase, Misao; Kurata, Noritaka; Haruyama, Mitsuo; Soyama, Kazuhiko; Kureta, Masatoshi; Seya, Michio
no journal, ,
no abstracts in English
Ozu, Akira; Takase, Misao; Kurata, Noritaka; Kobayashi, Nozomi; Yoshino, Seiji; Kureta, Masatoshi; Nakamura, Tatsuya; Soyama, Kazuhiko; Nakamura, Hironobu; Seya, Michio; et al.
no journal, ,
no abstracts in English
Sakasai, Kaoru; Nakamura, Tatsuya; To, Kentaro; Suzuki, Hiroyuki; Ozu, Akira; Ebine, Masumi; Birumachi, Atsushi; Takase, Misao; Kurata, Noritaka; Yoshino, Seiji; et al.
no journal, ,
We have developed the neutron-sensitive scintillator neutron counter for nuclear safeguards. The detector is made based on the scintillator detector technology developed long in the J-PARC/MLF. The detector is comprised of the ZnS/BO ceramic scintillator, rectangular shaped light guide and photomultiplier tubes. The detector performances including detector efficiency and its incident position dependence and -ray sensitivity are presented in detail.
Ozu, Akira; Takase, Misao*; Haruyama, Mitsuo; Kurata, Noritaka*; Kobayashi, Nozomi*; Tobita, Hiroshi; Kureta, Masatoshi; Nakamura, Tatsuya; To, Kentaro; Suzuki, Hiroyuki; et al.
no journal, ,
no abstracts in English
Ozu, Akira; Kureta, Masatoshi; Kobayashi, Nozomi*; Takase, Misao*; Kurata, Noritaka*; Tobita, Hiroshi; Haruyama, Mitsuo; Nakamura, Tatsuya; Suzuki, Hiroyuki; Sakasai, Kaoru; et al.
no journal, ,
no abstracts in English
