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Tamura, Koji; Oba, Hironori; Saeki, Morihisa; Taguchi, Tomitsugu*; Lim, H. H.*; Taira, Takunori*; Wakaida, Ikuo
Journal of Nuclear Science and Technology, 58(4), p.405 - 415, 2021/04
Times Cited Count：15 Percentile：83.18(Nuclear Science & Technology)Radiation dose rate effects on the properties of a compact fiber-optic laser-induced breakdown spectroscopy (LIBS) system with a monolithic Nd:YAG/Cr:YAG composite ceramics were investigated for remote analysis in hazardous environment. To investigate radiation effects on the LIBS signal, properties related to the Nd:YAG laser operation such as oscillation threshold, output energy, oscillation timing, temporal pulse shape, and beam profile were measured as a function of the radiation dose rate from 0 to 10 kGy/hr in view of their influences to the signal. LIBS spectra of zirconium metal were measured under irradiation. Although signal intensity decreased considerably by irradiation, informative spectra were well obtained even at the maximum radiation dose rate. From the comparison of the LIBS-related parameters among the laser properties, signal reduction was mainly ascribed to the pulse energy reduction. Scintillation emission spectra were also measured from the ceramics during the irradiation, where the signal intensity increased linearly with the dose rate. The results show that the developed system.
Nakayama, Masashi; Tanai, Kenji
JAEA-Review 2019-032, 32 Pages, 2020/02
JAEA-Review-2019-032.pdf:1.84MB
There are various types of monitoring in the geological disposal of high-level radioactive waste, such as monitoring for confirmation of construction quality and the status of engineered barrier, and monitoring to help manage construction, operation and closure activities, etc. Among these monitoring methods, monitoring related to the confirmation of the state of engineered barrier has been studied in international joint research on monitoring concepts and specific methods. Since monitoring equipment is affected by temperature, humidity, pressure, radiation, water quality, etc., it is important to consider geological environmental conditions and radiation effects. This report compares the radiation resistance of the materials used in the monitoring equipment with the absorbed dose in the buffer material obtained by analysis, and qualitatively examines the effects of radiation on the monitoring equipment. As a result of the examination, it was estimated that the dose did not affect the monitoring equipment. However, it is necessary to verify the possibility of reliable data acquisition by irradiation tests for monitoring devices with built-in electronic components.
Mizuta, Eiichi*; Kuboyama, Satoshi*; Abe, Hiroshi; Iwata, Yoshiyuki*; Tamura, Takashi*
IEEE Transactions on Nuclear Science, 61(4), p.1924 - 1928, 2014/08
Times Cited Count：109 Percentile：99.25(Engineering, Electrical & Electronic)Wakai, Eiichi; Otsuka, Hideo*; Matsukawa, Shingo; Furuya, Kazuyuki*; Tanigawa, Hiroyasu; Oka, Keiichiro*; Onuki, Somei*; Yamamoto, Toshio*; Takada, Fumiki; Jitsukawa, Shiro
Fusion Engineering and Design, 81(8-14), p.1077 - 1084, 2006/02
Times Cited Count：11 Percentile：59.17(Nuclear Science & Technology)no abstracts in English
Kobayashi, Yasuhiko; Funayama, Tomoo; Wada, Seiichi; Hamada, Nobuyuki*
JAERI-Conf 2005-012, 53 Pages, 2005/09
JAERI-Conf-2005-012.pdf:5.11MB
no abstracts in English
Wakai, Eiichi; Taguchi, Tomitsugu; Yamamoto, Toshio*; Tomita, Hideki*; Takada, Fumiki; Jitsukawa, Shiro
Materials Transactions, 46(3), p.481 - 486, 2005/03
Times Cited Count：10 Percentile：56.62(Materials Science, Multidisciplinary)no abstracts in English
Department of Materials Science
JAERI-Review 2004-027, 131 Pages, 2004/12
JAERI-Review-2004-027.pdf:17.03MB
This report is research activities using Tandem Accelerator in Tokai during April 1st in 2003 to March 31st in 2004, and contains 42 reports of 7sections of (1) operation and developments of tandem accelerator, (2) nuclear structure, (3) nuclear reactions, (4) nuclear chemistry, (5) nuclear theory, (6) atomic physics and solid state physics, (7) radiation effect of materials, and also contains of publication lists, personnel for related activities and the cooperation research program between JAERI and universities, national research organizations and so on.
Yamakawa, Koji*; Chimi, Yasuhiro; Ishikawa, Norito; Iwase, Akihiro*
Journal of Alloys and Compounds, 370(1-2), p.211 - 216, 2004/05
Times Cited Count：1 Percentile：12.20(Chemistry, Physical)The migration of hydrogen in Pd-1at.% Fe-H and Pd-1at.% Ag-H alloys is investigated by electrical resistivity measurement around 50 K. The disordered hydrogen atoms are introduced by electron irradiation with 0.5 MeV electrons below 15 K. The disordered atoms order by migration of hydrogen atoms during the heating-up of the specimens. The recovery curves of electrical resistivity have two sub-stages for electron irradiated specimens and one stage for fast cooled specimens. The migration energy of hydrogen is obtained from the kinetic analysis of the resistivity change due to the ordering, using the cross-cut method for the electron irradiated specimen and fast cooled specimen. The obtained value of the migration energy for the low temperature stage is smaller than that for the high temperature stage. The value for the high temperature stage is similar to the energy for the case of fast cooling. The difference between the hydrogen atoms disordered by irradiation and that by fast cooling is discussed for Pd based alloys.
Nemoto, Yoshiyuki; Hasegawa, Akira*; Sato, Manabu*; Abe, Katsunori*; Hiraoka, Yutaka*
Journal of Nuclear Materials, 324(1), p.62 - 70, 2004/01
Times Cited Count：50 Percentile：93.40(Materials Science, Multidisciplinary)In this study, stress-relieved specimens and recrystallized specimens of pure Mo and Mo-Re alloys (Re content=2,4,5,10,13 and 41wt%) were neutron irradiated up to 20dpa at various temperatures (681-1072K). On microstructure observation, sigma phase and chi phase precipitates were observed in all irradiated Mo-Re alloys. Voids were observed in all irradiated specimen, and dislocation loops and dislocations were observed in the specimens that were irradiated at lower temperatures. On Vickers hardness testing, all of the irradiated specimens showed hardening. Especially Mo-41Re were drastically embrittled after irradiation at 874K or less. From these results, authors discuss about relation between microstructure development and radiation hardening, embrittlement, and propose the most efficient Re content and thermal treatment for Mo-Re alloys to be used under irradiation condition.
Department of Materials Science
JAERI-Review 2003-028, 173 Pages, 2003/11
JAERI-Review-2003-028.pdf:8.28MB
This annual report describes research activities which have been performed with the JAERI tandem accelerator from April 1, 2002 to March 31, 2003. Summary reports of 54 papers, and lists of publication, personnel and cooperative research with universities are contained.
Ishii, Toshimitsu; Ooka, Norikazu; Hoshiya, Taiji; Kobayashi, Hideo*; Saito, Junichi; Niimi, Motoji; Tsuji, Hirokazu
Journal of Nuclear Materials, 307-311(Part.1), p.240 - 244, 2002/12
Times Cited Count：3 Percentile：22.77(Materials Science, Multidisciplinary)no abstracts in English
bulk samples and formation of columner defects on high-Tc supercoductorOkayasu, Satoru; Sasase, Masato; Hojo, Kiichi; Chimi, Yasuhiro; Iwase, Akihiro; Ikeda, Hiroshi*; Yoshizaki, Ryozo*; Kambara, Tadashi*; Sato, H.*; Hamatani, Yutaro*; et al.
Physica C, 382(1), p.104 - 107, 2002/10
Times Cited Count：29 Percentile：75.59(Physics, Applied)no abstracts in English
Iida, Toshiyuki*; Tanaka, Teruya*; Sato, Fuminobu*; Ochiai, Kentaro; Nishitani, Takeo
JAERI-Tech 2002-077, 38 Pages, 2002/09
no abstracts in English
Nishitani, Takeo; Shikama, Tatsuo*; Sugie, Tatsuo; Kasai, Satoshi; Ishitsuka, Etsuo; Kawamura, Hiroshi; Kakuta, Tsunemi; Yagi, Toshiaki; Tanaka, Shigeru; Narui, Makoto*; et al.
JAERI-Research 2002-007, 149 Pages, 2002/03
JAERI-Research-2002-007.pdf:8.08MB
no abstracts in English
Advanced Radiation Technology Center
JAERI-Review 2001-039, 328 Pages, 2001/11
JAERI-Review-2001-039.pdf:41.69MB
no abstracts in English
Yamamoto, Shin; Shikama, Tatsuo*; Belyakov, V.*; Farnum, E.*; Hodgson, E. R.*; Nishitani, Takeo; Orlinski, D.*; Zinkle, S.*; Kasai, Satoshi; Stott, P.*; et al.
Journal of Nuclear Materials, 283-287(1), p.60 - 69, 2000/12
Times Cited Count：69 Percentile：96.26(Materials Science, Multidisciplinary)no abstracts in English
Advanced Radiation Technology Center
JAERI-Review 2000-024, 326 Pages, 2000/10
JAERI-Review-2000-024.pdf:33.65MB
no abstracts in English
Advanced Radiation Technology Center
JAERI-Review 99-025, p.298 - 0, 1999/10
JAERI-Review-99-025.pdf:23.84MB
no abstracts in English
; ; ; Seguchi, Tadao; Tabata, Yoneho*
Radiation Physics and Chemistry, 55(4), p.399 - 408, 1999/00
Times Cited Count：15 Percentile：71.78(Chemistry, Physical)no abstracts in English
; Oyama, Yukio;
JAERI-Research 97-042, 87 Pages, 1997/06
JAERI-Research-97-042.pdf:2.38MB
no abstracts in English
