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Takasaki, Koji; Yasumune, Takashi; Yamaguchi, Yukako; Hashimoto, Makoto; Maeda, Koji; Kato, Masato
Journal of Nuclear Science and Technology, 60(11), p.1437 - 1446, 2023/11
Times Cited Count：0 Percentile：0.01(Nuclear Science & Technology)The aerodynamic radioactive median diameter (AMAD) is necessary information to assess the internal exposure. On June 6, 2017, at a plutonium handling facility in Oarai site of Japan Atomic Energy Agency (JAEA), during the inspection work of a storage container that contains nuclear fuel materials, accidental contamination occurred and five workers inhaled radioactive materials including plutonium. Some smear papers and an air sampling filter were measured with the imaging plate, and we conservatively estimated minimum AMADs for two cases, plutonium nitrate and plutonium dioxide. As a result of AMAD estimation, even excluding a giant particle of a smear sample, the minimum AMADs of plutonium nitrate from smear papers were 4.3 - 11.3 
m and those of plutonium dioxide were 5.6 - 14.1 m. Also, the minimum AMAD of plutonium nitrate from an air sampling filter was 3.0 m and that of plutonium dioxide was 3.9 m.
Tanabe, Tetsuo*; Sugiyama, Kazuyoshi*; Coad, P.*; Bekris, N.*; Glugla, M.*; Miya, Naoyuki
Journal of Nuclear Materials, 345(2-3), p.89 - 95, 2005/10
Times Cited Count：17 Percentile：73.49(Materials Science, Multidisciplinary)no abstracts in English
Yasuda, Ryo; Matsubayashi, Masahito; Nakata, Masahito; Harada, Katsuya; Amano, Hidetoshi; Sasajima, Fumio; Nishi, Masahiro; Horiguchi, Yoji
IEEE Transactions on Nuclear Science, 52(1), p.313 - 316, 2005/02
Times Cited Count：14 Percentile：67.84(Engineering, Electrical & Electronic)Neutron radiography is useful to inspect macroscopic change in nuclear fuels before and after irradiation. We have been investigated the practicality of neutron imaging plate and neutron CT methods for the inspection of the spent fuels. A fresh UO2 fuel rod was examined by those methods. The test results of those samples are available to develop the system of those methods for the spent fuels and to determine the specifications of the system. Some good images of those samples are obtained by those examinations. The shape of the pellets in the fuel rod is clearly recognized in the image. Those images are analyzed to estimate the size of some parts in the fuel pellets.
Sakasai, Kaoru; Katagiri, Masaki; Matsubayashi, Masahito; Nakamura, Tatsuya; Kondo, Yasuhiro*
Hoshasen, 29(4), p.189 - 197, 2003/10
no abstracts in English
Yasuda, Ryo; Nakata, Masahito; Matsubayashi, Masahito; Harada, Katsuya; Hatakeyama, Yuichi; Amano, Hidetoshi
Journal of Nuclear Materials, 320(3), p.223 - 230, 2003/08
Times Cited Count：15 Percentile：69.06(Materials Science, Multidisciplinary)Neutron radiography is one of effective tools to determine hydrided region in Zircaloy cladding tubes. In this work, the practicability of the neutron radiography for hydrogen analysis is further investigated by using standard samples with known hydrogen concentration. Local hydrogen concentration in hydrided Zircaloy tube is quantitatively estimated using the standard samples by neutron imaging plate (NIP) method. The local area is equivalent to a picture element in the image; e.g., 0.1mm
0.1mm. In addition, contribution of an oxide film in the tubes to the images is investigated using oxidized samples with hydrides or no hydride. In NIP images of oxidized tube no oxide film was recognized. Numerical image analysis also shows no effect of the oxide film on the image. These results show that the influence of oxygen on image contrast can be neglected when hydrogen analysis is performed on the Zircaloy tube with oxide film and hydrides by NIP method.
Tanabe, Tetsuo*; Bekris, N.*; Coad, P.*; Skinner, C. H.*; Glugla, M.*; Miya, Naoyuki
Journal of Nuclear Materials, 313-316, p.478 - 490, 2003/03
Times Cited Count：67 Percentile：96.51(Materials Science, Multidisciplinary)no abstracts in English
Niimura, Nobuo; Chatake, Toshiyuki; Ostermann, A.; Kurihara, Kazuo; Tanaka, Ichiro
Zeitschrift f
r Kristallographie, 218(2), p.96 - 107, 2003/03
no abstracts in English
Sugiyama, Kazuyoshi*; Miyasaka, Kazutaka*; Tanabe, Tetsuo*; Masaki, Kei; Goto, Yoshitaka*; Tobita, Kenji; Kodama, Kozo; Miya, Naoyuki
Physica Scripta, T103, p.56 - 58, 2003/00
Times Cited Count：14 Percentile：62.77(Physics, Multidisciplinary)no abstracts in English
Yasuda, Kenichiro; Sakurai, Satoshi; Gunji, Hideho; Usuda, Shigekazu
Journal of Nuclear Science and Technology, 39(Suppl.3), p.552 - 555, 2002/11
In order to contribute to the strengthened safeguards system based on the Program 93+2 of the IAEA, Japan Atomic Energy Research Institute (JAERI) constructed the CLEAR facility (Clean Laboratory for Environmental Analysis and Research) and is developing analytical technology for ultra trace amounts of nuclear materials in environmental samples. To avoid cross-contamination among the samples and contamination of the clean rooms, radioactive materials in the samples to be introduced into the CLEAR facility will be limited to a certain amount. For this purpose the authors have examined the feasibility of Imaging-plate method, which is a kind of autoradiography and is suitable for determination on distribution of low-level radioactivity in the samples. Preliminary examination with 
-ray (K-40), the linearity was obtained in the range of 0.01 - 0.2 Bq. The experiments with 
-ray (Sm-147) suggested the detection limit of 0.01 Bq, which was equivalent to 2 g of natural uranium. At the presentation, the results on actual environmental samples will be reported.
Haga, Yuko*; Neriishi, Keiko*; Takahashi, K.*; Niimura, Nobuo
Nuclear Instruments and Methods in Physics Research A, 487(3), p.504 - 510, 2002/07
Times Cited Count：9 Percentile：51.46(Instruments & Instrumentation)no abstracts in English
Tanabe, Tetsuo*; Miyasaka, Kazutaka*; Sugiyama, Kazuyoshi*; Masaki, Kei; Kodama, Kozo; Miya, Naoyuki
Fusion Engineering and Design, 41(3), p.877 - 881, 2002/05
no abstracts in English
Kutsukake, Chuzo; Seki, Masakazu; Tanaka, Shigeru; Oginuma, Yoshikazu*; Abe, Yuichi; Yamauchi, Michinori*
Fusion Science and Technology, 41(3), p.555 - 559, 2002/05
no abstracts in English
Yasuda, Ryo; Matsubayashi, Masahito; Nakata, Masahito; Harada, Katsuya
Journal of Nuclear Materials, 302(2-3), p.156 - 164, 2002/04
Times Cited Count：28 Percentile：83.24(Materials Science, Multidisciplinary)no abstracts in English
Katagiri, Masaki; Sakasai, Kaoru; Kishimoto, Maki; Nakamura, Tatsuya; To, Kentaro; Takahashi, Hiroyuki*; Nakazawa, Masaharu*
Nuclear Instruments and Methods in Physics Research A, 477(1-3), p.179 - 183, 2002/03
Times Cited Count：4 Percentile：29.4(Instruments & Instrumentation)no abstracts in English
Yasuda, Ryo; Matsubayashi, Masahito; Nakata, Masahito; Harada, Katsuya; Amano, Hidetoshi; Ando, Hitoshi*; Sasajima, Fumio; Nishi, Masahiro; Horiguchi, Yoji
JAERI-Tech 2002-001, 23 Pages, 2002/02
JAERI-Tech-2002-001.pdf:3.79MB
Advanced neutron radiography techniques such as neutron imaging plate (NIP) and Computed Tomography (CT) methods have been investigated the practicality for Post Irradiation Examination (PIE). In this work, an unirradiated fuel rod was examined by NIP and CT methods in order to collect the fundamental data for applying these techniques to PIE.The fuel rod is composed of seven-enriched UO2 pellet and two-natural UO2 pellet that are loaded into a Zircaloy tube. There are somewhat difference in the size and shape among those UO2 pellets. A transmitted and cross-sectional images were obtained by NIP and CT methods, respectively.In the NIP image, the difference in the size, shape, and enrichment among the UO2 pellets is obviously recognized. In the case of CT method, the images clearly show the detailed shape of the cross section in the pellets, in addition, the difference in the enrichment between the natural and enriched pellets is recognized.
Sakasai, Kaoru; Katagiri, Masaki; Nakamura, Tatsuya; To, Kentaro; Takahashi, Hiroyuki*; Nakazawa, Masaharu*
IEEE Transactions on Nuclear Science, 49(1), p.156 - 159, 2002/02
Times Cited Count：0 Percentile：0.01(Engineering, Electrical & Electronic)no abstracts in English
Tanabe, Tetsuo*; Sugiyama, Kazuyoshi*; Masaki, Kei; Goto, Yoshitaka*; Tobita, Kenji; Miya, Naoyuki
IAEA-CN-94/EX/P2-11 (CD-ROM), 6 Pages, 2002/00
no abstracts in English
Tanabe, Tetsuo*; Miyasaka, Kazutaka*; Masaki, Kei; Miya, Naoyuki
Purazuma, Kaku Yugo Gakkai-Shi, 77(11), p.1083 - 1084, 2001/11
no abstracts in English
Sakasai, Kaoru; Katagiri, Masaki; To, Kentaro; Nakamura, Tatsuya; Takahashi, Hiroyuki*; Nakazawa, Masaharu*
Journal of the Physical Society of Japan, Vol.70, Supplement A, p.468 - 470, 2001/05
Times Cited Count：11 Percentile：56.48(Physics, Multidisciplinary)no abstracts in English
