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Cs plumes from the Fukushima Daiichi Nuclear Power Plant; Evaluation of the model intercomparison data of the Science Council of JapanKitayama, Kyo*; Morino, Yu*; Takigawa, Masayuki*; Nakajima, Teruyuki*; Hayami, Hiroshi*; Nagai, Haruyasu; Terada, Hiroaki; Saito, Kazuo*; Shimbori, Toshiki*; Kajino, Mizuo*; et al.
Journal of Geophysical Research; Atmospheres, 123(14), p.7754 - 7770, 2018/07
Times Cited Count：24 Percentile：69.81(Meteorology & Atmospheric Sciences)We compared seven atmospheric transport model results for Cs released during the Fukushima Daiichi Nuclear Power Plant accident. All the results had been submitted for a model intercomparison project of the Science Council of Japan in 2014. We assessed model performance by comparing model results with observed hourly atmospheric concentrations of Cs, focusing on nine plumes over the Tohoku and Kanto regions. The results showed that model performance for Cs concentrations was highly variable among models and plumes. We also assessed model performance for accumulated Cs deposition. Simulated areas of high deposition were consistent with the plume pathways, though the models that best simulated Cs concentrations were different from those that best simulated deposition. The ensemble mean of all models consistently reproduced Cs concentrations and deposition well, suggesting that use of a multimodel ensemble results in more effective and consistent model performance.
-ray emitting radioactive nuclides from the Fukushima Dai-ichi Nuclear Power Plant accidentSaito, Kimiaki; Tanihata, Isao*; Fujiwara, Mamoru; Saito, Takashi*; Shimoura, Susumu*; Otsuka, Takaharu*; Onda, Yuichi*; Hoshi, Masaharu*; Ikeuchi, Yoshihiro*; Takahashi, Fumiaki; et al.
Journal of Environmental Radioactivity, 139, p.308 - 319, 2015/01
Times Cited Count：224 Percentile：98.8(Environmental Sciences)Satoh, Daiki; Maeda, Yoshikazu*; Tameshige, Yuji*; Nakashima, Hiroshi; Shibata, Tokushi*; Endo, Akira; Tsuda, Shuichi; Sasaki, Makoto*; Maekawa, Motokazu*; Shimizu, Yasuhiro*; et al.
Journal of Nuclear Science and Technology, 49(11), p.1097 - 1109, 2012/11
Times Cited Count：14 Percentile：71.22(Nuclear Science & Technology)At the Fukui Prefectural Hospital Proton Therapy Center, neutron doses behind concrete shields and at maze have been measured by using radiation monitors, DARWIN, Wendi-2, a rem meter, and solid state nuclear track detectors. The measured data were compared with the estimations by analytical models and Monte Carlo code PHITS. The analytical model with the parameters employed in shielding design of the facility gave considerably larger estimates than the measured data. This means that the facility was designed with an enough safety margin. The calculation results of PHITS were less than those of the analytical model, and were about 3 times larger than the measured data. From the view point of a safety policy with conservative estimation for shielding design, Monte Carlo simulation is a better tool for estimating radiation safety at accelerator-based proton treatment facilities.
Enomoto, Shuichi*; Kawamura, Hiroshi; Shirakawa, Yoshiyuki*; Nakanishi, Tomoko*; Nakamura, Kayoko*; Yano, Tsuneo*; Ido, Tatsuo*; Shibata, Tokushi
Isotope News, (657), p.2 - 11, 2009/01
The view of the future and the necessity of the system construction such as supply systems were shown about production of the medical diagnostics 
Mo and the silicon semiconductor on JMTR.
Be(p,xn) and Be(d,xn) reactions at 10 MeVIwamoto, Yosuke; Sakamoto, Yukio; Matsuda, Norihiro; Nakane, Yoshihiro; Ochiai, Kentaro; Kaneko, Hirohisa; Niita, Koji*; Shibata, Tokushi; Nakashima, Hiroshi
Nuclear Instruments and Methods in Physics Research A, 598(3), p.687 - 695, 2009/01
Times Cited Count：21 Percentile：79.19(Instruments & Instrumentation)Double-differential neutron-production cross-sections of a thin beryllium target bombarded with 10 MeV protons and deuterons were measured. Neutron energy spectra in the range above 1.8 MeV were obtained by a time-of-flight method at angles of 15, 30, 45, 60, 75, 90 and 120 degrees. Monte Carlo calculations with the PHITS code were performed using the evaluated nuclear data files ENDF/B-VII, the Bertini/GEM model and the JQMD/GEM model, and compared with the experimental results. It was found that the calculated results using ENDF/B-VII and Bertini/GEM for the Be(p,xn) reaction and JQMD/GEM for the Be(d,xn) reaction roughly agreed with the experimental results.
Shibata, Tokushi
Nihon Butsuri Gakkai-Shi, 63(4), p.257 - 264, 2008/04
The current status for the utilization of radiation in Japan was given from the view point of the economic scale. The topics which will be developed in near future such as lithography, radiation processing, radiation analysis in the industry, mutation breeding, sterile insect technique, food irradiation in agriculture, and radiation diagnosis, radiation therapy in medical field were presented. The important techniques for the further development of utilization of radiation will be the techniques related to the fabrication of semiconductor, developments of small accelerators and compact neutron generators.
Shibata, Tokushi
Isotope News, (630), p.21 - 26, 2006/10
An explanation from the view point of educational experimental apparatus on the process of the development of a spark chamber, a hodoscope chamber, a chamber for demonstration, and a handmade spark chamber is presented.
Shibata, Tokushi
Hoshasen, 32(3), p.156 - 166, 2006/07
no abstracts in English
Nakashima, Hiroshi; Shibata, Tokushi; Nakane, Yoshihiro; Masukawa, Fumihiro; Matsuda, Norihiro; Iwamoto, Yosuke; Hirayama, Hideo*; Suzuki, Takenori*; Miura, Taichi*; Numajiri, Masaharu*; et al.
Proceedings of 14th Biennial Topical Meeting of the ANS Radiation Protection and Shielding Division (CD-ROM), p.267 - 282, 2006/00
no abstracts in English
Nakashima, Hiroshi; Nakane, Yoshihiro; Masukawa, Fumihiro; Matsuda, Norihiro; Oguri, Tomomi*; Nakano, Hideo*; Sasamoto, Nobuo*; Shibata, Tokushi*; Suzuki, Takenori*; Miura, Taichi*; et al.
Radiation Protection Dosimetry, 115(1-4), p.564 - 568, 2005/12
Times Cited Count：8 Percentile：49.16(Environmental Sciences)The High Intensity Proton Accelerator Project, named as J-PARC, is in progress, aiming at studies on the latest basic science and the advancing nuclear technology. In the project, the high-energy proton accelerator complex of the world highest intensity is under construction. In order to establish a reasonable shielding design, both simplified and detailed design methods were used in the shielding design of J-PARC. This paper reviews the present status of the radiation safety design study for J-PARC.
Sasamoto, Nobuo; Nakashima, Hiroshi; Hirayama, Hideo*; Shibata, Tokushi*
Journal of Nuclear Science and Technology, 39(Suppl.2), p.1264 - 1267, 2002/08
no abstracts in English
Sasaki, Michiya*; Nunomiya, Tomoya*; Nakamura, Takashi*; Nakao, Noriaki*; Shibata, Tokushi*; Nakane, Yoshihiro; Tanaka, Susumu
JAERI-Review 2000-024, TIARA Annual Report 1999, p.259 - 261, 2000/10
no abstracts in English
Fukahori, Tokio; Mukaiyama, Takehiko; Oyama, Yukio; Chiba, Satoshi; Takada, Hiroshi; Maekawa, Hiroshi; Shibata, Tokushi*; Nakamura, Takashi*; *; *; et al.
Nihon Genshiryoku Gakkai-Shi, 40(1), p.3 - 28, 1998/00
Times Cited Count：1 Percentile：11.76(Nuclear Science & Technology)no abstracts in English
O electrolysis using a palladium cathode; An Undivided, open cell system*; *; *; *; *; *; *; Oyama, Yukio; Nakamura, Tomoo; Shibata, Tokushi*; et al.
Bulletin of the Chemical Society of Japan, 63(9), p.2659 - 2664, 1990/09
Times Cited Count：1 Percentile：15.74(Chemistry, Multidisciplinary)no abstracts in English
Uwamino, Yoshitomo*; Okubo, Toru*; Shibata, Seiichi*; Shibata, Tokushi*
PNC TJ2602 87-003, 32 Pages, 1988/03
None
Shibata, Tokushi
no journal, ,
An estimation of the fast neutron fluence for the Hiroshima Atomic Bomb was carried out. The method is to estimate the fluence using the amount of the 
Ni contents in copper samples, neutron spectrum for the Hiroshima Atomic Bomb, and the excitation function of the Cu(n, p) Ni reaction. The extraction method of the trace amount of the Ni from copper samples was developed. The Ni was measured by a low-background liquid-scintillation counter. The excitation function of the Cu(n,p) Ni reaction was measured. The fluence was obtained from the measured Ni amount using the neutron spectrum and the excitation function of the reaction. The obtained results are consistent with the values given by the new dosimetry system D02.
Nakashima, Hiroshi; Shibata, Tokushi; Sawahata, Kei; Miyamoto, Yukihiro; Nakane, Yoshihiro; Masukawa, Fumihiro; Seki, Kazunari; Sato, Koichi; Oguri, Tomomi*; Hirayama, Hideo*; et al.
no journal, ,
Aiming at studies on the latest basic science and the advancing nuclear technology, the J-PARC (Japan Proton Accelerator Research Complex) project is in progress, and the high-energy proton accelerator complex of the world highest intensity is under construction. Because of its very high beam power and its energy as well as the large-scale accelerator complex, we have encountered some difficult radiation problems in the radiation safety design. This paper reviews the radiation safety policy and methods for the design to overcome the problems on the radiation safety and the status of the radiation safety estimation for licensing of J-PARC.
Iwamoto, Yosuke; Matsuda, Norihiro; Sakamoto, Yukio; Ochiai, Kentaro; Nakane, Yoshihiro; Nakashima, Hiroshi; Shibata, Tokushi
no journal, ,
no abstracts in English
Iwamoto, Yosuke; Matsuda, Norihiro; Sakamoto, Yukio; Ochiai, Kentaro; Nakane, Yoshihiro; Nakashima, Hiroshi; Shibata, Tokushi
no journal, ,
no abstracts in English
Shibata, Tokushi; Nakashima, Hiroshi; Nakane, Yoshihiro; Masukawa, Fumihiro; Matsuda, Norihiro; Miura, Taichi*; Numajiri, Masaharu*; Suzuki, Takenori*; Takeuchi, Yasunori*
no journal, ,
J-PARC (Japan Proton Accelerator Research Complex) consists of a 400 MeV LINAC, a 3 GeV synchrotron, a 50 GeV synchrotron and three experimental halls for material and life science, hadron physics and neutrino physics. The radiation safety design for J-PARC is based on calculations on radiation outside the shielding, on the boundary of the controlled area and on the cite boundary. In order to study the accuracy of different methods and make clear the differences among different methods, some benchmark analyses on beam dump, bulk shielding, streaming and activation experiments were carried out. The activation of air, cooling water and the activation of soil and its effect to underground water have been also estimated. Since J-PARC is a complex accelerator facility, an interlock system is important for radiation safety. To prevent unintended radiation exposure, a carefully designed system was incorporated.
