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Seki, Misaki; Ishikawa, Koji*; Sano, Tadafumi*; Nagata, Hiroshi; Otsuka, Kaoru; Omori, Takazumi; Hanakawa, Hiroki; Ide, Hiroshi; Tsuchiya, Kunihiko; Fujihara, Yasuyuki*; et al.
KURNS Progress Report 2019, P. 279, 2020/08
no abstracts in English
Seki, Misaki; Ishikawa, Koji*; Nagata, Hiroshi; Otsuka, Kaoru; Omori, Takazumi; Hanakawa, Hiroki; Ide, Hiroshi; Tsuchiya, Kunihiko; Sano, Tadafumi*; Fujihara, Yasuyuki*; et al.
KURNS Progress Report 2018, P. 257, 2019/08
no abstracts in English
GdNiOkane, Tetsuo; Takeda, Yukiharu; Yano, Kazuo*; Fujimori, Atsushi; Yamagami, Hiroshi; Nishimura, Katsuhiko*; Ishikawa, Yoshikazu*; Sato, Kiyoo*
JPS Conference Proceedings (Internet), 3, p.011028_1 - 011028_6, 2014/06
Kugo, Teruhiko; Ishikawa, Makoto; Nagaya, Yasunobu; Yokoyama, Kenji; Fukaya, Yuji; Maruyama, Hiromi*; Ishii, Yoshihiko*; Fujimura, Koji*; Kondo, Takao*; Minato, Hirokazu*; et al.
JAEA-Research 2013-046, 53 Pages, 2014/03
JAEA-Research-2013-046.pdf:4.42MB
The present report summarizes the results of a 2-year cooperative study between JAEA and Hitachi-GE in order to contribute to the settlement of the Fukushima-Daiichi Nuclear Power Plants which suffered from the severe accident on March 2011. In the present study, the possible scenarios to reach the recriticality events in Fukushima-Daiichi were investigated first. Then, the analytical methodology to evaluate the time-dependent recriticality events has been developed by modelling the reactivity insertion rate and the possible feedback according to the recriticality scenarios identified in the first step. The methodology developed here has been equipped as a transient simulation tool, PORCAS, which is operated on a multi-purpose platform for reactor analysis, MARBLE. Finally, the radiation exposure rates by the postulated recriticality events in Fukushima-Daiichi were approximately evaluated to estimate the impact to the public environment.
Ishikawa, Koji*; Inaba, Yoshitomo; Tsuchiya, Kunihiko
JAEA-Testing 2009-004, 16 Pages, 2010/02
JAEA-Testing-2009-004.pdf:4.14MB
In the solution irradiation method, which is proposed as new 
Mo production method, the molybdate solution of an irradiation target flows in a capsule. However, the compatibility between the flowing aqueous molybdate solution and the structural materials of capsules and pipes was not clear. Therefore, test apparatuses for the investigation of the compatibility were designed and fabricated. Preliminary tests with the test apparatuses were also carried out, and it was confirmed that planed tests could be carried out.
Mo production by Mo-solution irradiation method, 3; Activation analysis of irradiation targetHuynh, T. P.*; Inaba, Yoshitomo; Ishida, Takuya; Ishikawa, Koji*; Tatenuma, Katsuyoshi*; Ishitsuka, Etsuo
JAEA-Technology 2009-039, 21 Pages, 2009/07
JAEA-Technology-2009-039.pdf:2.53MB
The impurity concentration in both (NH
)
Mo
O
and K
MoO solutions, which are selected as advanced targets of Mo-solution irradiation method for Mo production, was determined by the Instrumental Neutron Activation Analysis (NAA) using k
-standardization method. As a result, Na, Mn and W were identified as impurities in the as received molybdate. After the compatibility test with structural material (SUS304) under 
-ray irradiation, activation analysis of molybdate solutions was also carried out. It was found that the identified impurity concentration was stably staying in solutions and no element comes from the structural material by the NAA method. However, small corrosion of structural material was observed from the ICP measurement.
Mo production technique by solution irradiation method; Characterization of aqueous molybdate solutionsInaba, Yoshitomo; Ishikawa, Koji*; Tatenuma, Katsuyoshi*; Ishitsuka, Etsuo
Nihon Genshiryoku Gakkai Wabun Rombunshi, 8(2), p.142 - 153, 2009/06
A solution irradiation method is proposed as a new production technique of Mo, which is the parent nuclide of 
Tc used as a radiopharmaceutical. In this new method, an aqueous molybdenum solution is irradiated with neutron in a nuclear reactor, and efficient and low cost Mo production comparing with conventional Mo production methods can be realized by using the 
Mo (n,) Mo reaction and a high performance adsorbent for (n,) Mo. In the present research, some tests under unirradiation and -ray irradiation were carried out using two kinds of aqueous molybdate solutions to be candidates for the irradiation target of the new method, and the corrosivity for structural materials, chemical stability, radiolysis and heating of the solutions were investigated. As a result, it was found that the solutions are promising as the target and that stainless steel can be used as the structural material of capsules and pipes.
Mo production by solution irradiation method, 2; Characterization of aqueous molybdate solutions under -ray irradiationInaba, Yoshitomo; Ishikawa, Koji*; Iimura, Koichi; Tatenuma, Katsuyoshi*; Ishitsuka, Etsuo
JAEA-Technology 2009-013, 72 Pages, 2009/05
JAEA-Technology-2009-013.pdf:32.51MB
In the present study, using two kinds of aqueous molybdate solutions (an aqueous ammonium molybdate solution and an aqueous potassium molybdate solution) selected as candidates for the irradiation target of the solution irradiation method for Mo production, the compatibility between the solutions and structural materials, the chemical stability, circulation characteristics, radiolysis and heating of the solutions were investigated under -ray irradiation. In addition, the integrity of PZC was investigated under -ray irradiation. As a result, the following were found: (1) the compatibility between the solutions and stainless steel is very well, (2) the solutions are chemically stable and have a smooth circulation, (3) the ratios of hydrogen in the gases generated by the radiolysis of the solutions are higher than that of pure water, (4) the effect of heating on the solutions is the same level as that on pure water, and (5) the integrity of PZC is maintained.
Mo production by solution irradiation method, 1; Characterization of aqueous molybdate solutions under unirradiationInaba, Yoshitomo; Ishikawa, Koji*; Iimura, Koichi; Tatenuma, Katsuyoshi*; Ishitsuka, Etsuo
JAEA-Technology 2009-012, 80 Pages, 2009/05
JAEA-Technology-2009-012.pdf:37.29MB
In the present study, the schematic structure of the Mo production system with the solution irradiation method was investigated, and two kinds of aqueous molybdate solutions (an aqueous ammonium molybdate solution and an aqueous potassium molybdate solution) were selected as candidates for the irradiation target of the solution irradiation method, and then the molybdenum adsorption performance of PZC with the solutions, the properties of the molybdates to be materials of the solutions, the compatibility between the solutions and structural materials, and the chemical stability of the solutions were investigated under unirradiation. As a result, it was found that the aqueous potassium molybdate solution is promising as the target in terms of the molybdenum content, the compatibility with the structural materials, and the chemical stability and that the aqueous ammonium molybdate solution with suitable pH adjustment has an aptitude for the target. In addition, it became clear that stainless steel having good compatibility with the solutions has a potential as the structural material of capsules, pipes and so on.
Mo production technology by molybdenum solution irradiation methodInaba, Yoshitomo; Ishikawa, Koji*; Ishida, Takuya; Tatenuma, Katsuyoshi*; Ishitsuka, Etsuo
JAEA-Conf 2008-010, p.259 - 267, 2008/12
Tc for the medical diagnosis is the most widely used radioisotope in the world and it's demand is growing up year by year. In case of Japan, all Mo which is parent nuclide of Tc, is imported. However, the importance of the domestic production is pointed out from a viewpoint of the stable supply of Mo because of some troubles on transportation or the research reactor, and so on. Therefore, the (n,) method using solid molybdenum target had been planned in JMTR. However, it will be difficult to satisfy domestic demand because of the limited irradiation volumes of the hydraulic rabbit irradiation facility. In order to increase the amount of Mo production, the molybdenum solution irradiation method was proposed as a new production method. This method is based on the neutron irradiation of molybdenum solution, and several advantages can be pointed out such as a large irradiation volume, high efficient and low cost comparing with conventional methods using enriched 
U(n,f)Mo as the major method or using a solid molybdenum target of MoO
as the minor (n,) method. Aiming at the realization of the molybdenum solution irradiation method, un-irradiated and ray irradiated tests of the molybdenum solution were carried out, and the data of chemical stability and compatibility with the structural materials were shown.
W/Re generatorsMatsuoka, Hiromitsu; Hashimoto, Kazuyuki; Hishinuma, Yukio*; Ishikawa, Koji*; Terunuma, Hitoshi*; Tatenuma, Katsuyoshi*; Uchida, Shoji*
Journal of Nuclear and Radiochemical Sciences, 6(3), p.189 - 191, 2005/12
Applicability of Mo adsorbent PZC(Poly Zirconium Compound) for W/Re generator was investigated. Long term stability of adsorption of W to the PZC column, elution of Re from PZC column, desorption of 
from PZC column, and labeling of Hydroxyethylidene Diphosphonic Acid(HEDP) and Mercaptoacetyltriglycine(MAG3) with Re eluted from PZC column were tested. The PZC generator gave reproducible Re elution yields with low W parent breakthrough for a long period of time(about 5 months), that is the W/Re generator using PZC has a potential for practical use.
superconducting tubeYamauchi, Toshihiko; Matsuzawa, Hidenori*; Mikami, Koji*; Ishikawa, Junichi*
Japanese Journal of Applied Physics, Part 1, 41(9), p.5799 - 5800, 2002/09
Times Cited Count：3 Percentile：15.64(Physics, Applied)This paper describes the experimental result of the interaction between a high-Tc superconductor and charged particles (plasma). This study is expected for the interaction between the charged particle and superconductor in the group, high-Tc superconducting wiggler for electron beam of FEL (collaboration with Prof.Matsuzawa) and high-Tc superconducting tube for beam guiding published in the journal "Nature".
*; *; *; *; *; Tanase, Masakazu; Kurosawa, Kiyoyuki
Nihon Kagakkai-Shi, 0(10), p.888 - 894, 1996/00
no abstracts in English
W/Re generatorHashimoto, Kazuyuki; Hishinuma, Yukio*; Ishikawa, Koji*; Terunuma, Hitoshi*; Tatenuma, Katsuyoshi*; Uchida, Shoji*; Matsuoka, Hiromitsu
no journal, ,
Applicability of Mo adsorbent PZC(Poly Zirconium Compound) for W/Re generator was investigated. Up to the present, long term stability of adsorption of W to the PZC column, elution of Re from PZC column, desorption of W from PZC column, and labeling of Hydroxyethylidene Diphosphonic Acid (HEDP) and Mercaptoacetyltriglycine (MAG3) with Re eluted from PZC column were tested and the results were compared with that of Re eluted from alumina column.
Mo production method with irradiation of circulating Mo solution, 1; Results of cold tests (preliminary tests)Inaba, Yoshitomo; Ishikawa, Koji*; Ishida, Takuya; Ishitsuka, Etsuo; Kurosawa, Kiyoko*; Hishinuma, Yukio*; Tatenuma, Katsuyoshi*
no journal, ,
The circulating solution irradiation method is a new production method of Mo, which is the parent nuclide of Tc used as medical diagnosis medicine. In order to realize this method, compatibility between molybdenum solutions and structural materials, etc. were investigated. As a result, it was found that the potassium molybdate solution have good characteristics as an irradiation target.
Mo production by solution irradiation methodInaba, Yoshitomo; Ishikawa, Koji*; Ishida, Takuya; Ishitsuka, Etsuo; Huynh, T. P.*; Tatenuma, Katsuyoshi*
no journal, ,
The solution irradiation method is proposed as a new production technique of Mo, which is the parent nuclide of Tc used as a radiopharmaceutical. Aiming at the practical application of the new method, the compatibility between irradiation target solutions (aqueous molybdate solutions) and structural materials, and the chemical stability of the solutions were investigated under -ray irradiation. As a result, it was found that the corrosion of the structural materials immersed in the solutions does not progress in comparison with the results of the unirradiation tests and that the solutions are chemically stable.
Mo amount generated by irradiating natural Mo in JRR-3Komeda, Masao; Hirose, Akira; Sorita, Takami; Wada, Shigeru; Ishikawa, Koji*
no journal, ,
no abstracts in English
Tc generated from natural-Mo(n,)Mo, 4; Analysis in the verification test of the producing process of Tc milked from a highly radioactive MoSonoda, Takashi; Umeda, Miki; Tagami, Susumu; Kurobane, Shiro; Miyoshi, Yoshinori; Tanaka, Atsushi*; Ishikawa, Koji*; Tsuguchi, Akira*; Tatenuma, Katsuyoshi*
no journal, ,
no abstracts in English
Nemoto, Hideyuki; Wakai, Eiichi; Kinoshita, Hidetaka; Masuda, Shiho; Harada, Masahide; Takada, Hiroshi; Ishikawa, Koji*; Imanari, Kei*; Ito, Takeshi*
no journal, ,
no abstracts in English
Seki, Misaki; Ishikawa, Koji*; Nagata, Hiroshi; Otsuka, Kaoru; Omori, Takazumi; Suzuki, Yumi*; Tanaka, Atsushi*; Kawakami, Tomohiko*; Ide, Hiroshi; Tsuchiya, Kunihiko
no journal, ,
no abstracts in English
