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Journal Articles

Non-invasive imaging of radiocesium dynamics in a living animal using a positron-emitting $$^{127}$$Cs tracer

Suzui, Nobuo*; Shibata, Takuya; Yin, Y.-G.*; Funaki, Yoshihito*; Kurita, Keisuke; Hoshina, Hiroyuki*; Yamaguchi, Mitsutaka*; Fujimaki, Shu*; Seko, Noriaki*; Watabe, Hiroshi*; et al.

Scientific Reports (Internet), 10, p.16155_1 - 16155_9, 2020/10

 Times Cited Count:0 Percentile:0.01(Multidisciplinary Sciences)

Journal Articles

Establishment of a novel detection system for measuring primary knock-on atoms

Tsai, P.-E.; Iwamoto, Yosuke; Hagiwara, Masayuki*; Sato, Tatsuhiko; Ogawa, Tatsuhiko; Satoh, Daiki; Abe, Shinichiro; Ito, Masatoshi*; Watabe, Hiroshi*

Proceedings of 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC 2017) (Internet), 3 Pages, 2018/11

The energy spectra of primary knock-on atoms (PKAs) are essential for radiation damage assessment in design of accelerator facilities. However up to date the experimental data are still limited, due to the poor mass resolution and the high measurement threshold energies in the conventional setup of nuclear physics experiments using solid state detectors, which are typically above a few MeV/nucleon. In this study, a novel detection system consisting of two time detectors and one dE-E energy detector is proposed and being constructed to measure the PKA spectra. The system and detector design was based on Monte Carlo simulations by using the PHITS code. The PHITS simulations show that the system is able to distinguish the PKA isotopes above $$sim$$0.2-0.3 MeV/nucleon for A=20$$sim$$30 amu; the PKA mass identification thresholds decrease to $$<$$0.1 MeV/nucleon for PKAs lighter than 20 amu. The detection system will be tested in the summer of 2017, and the test results will be presented at the conference.

Journal Articles

Imaging of radiocesium dynamics in soybean by using a high-resolution gamma camera

Yin, Y.-G.; Kawachi, Naoki; Suzui, Nobuo; Ishii, Satomi; Yoshihara, Toshihiro*; Watabe, Hiroshi*; Yamamoto, Seiichi*; Fujimaki, Shu

JAEA-Review 2015-022, JAEA Takasaki Annual Report 2014, P. 112, 2016/02

Journal Articles

Development of a gamma camera system for high-energy gamma photon for quantitative observation of $$^{137}$$Cs movement in a plant body

Kawachi, Naoki; Yin, Y.-G.; Suzui, Nobuo; Ishii, Satomi; Yoshihara, Toshihiro*; Watabe, Hiroshi*; Yamamoto, Seiichi*; Fujimaki, Shu

JAEA-Review 2015-022, JAEA Takasaki Annual Report 2014, P. 94, 2016/02

Journal Articles

Imaging of radiocesium uptake dynamics in a plant body by using a newly developed high-resolution gamma camera

Kawachi, Naoki; Yin, Y.-G.; Suzui, Nobuo; Ishii, Satomi; Yoshihara, Toshihiro*; Watabe, Hiroshi*; Yamamoto, Seiichi*; Fujimaki, Shu

Journal of Environmental Radioactivity, 151(Part 2), p.461 - 467, 2016/01

 Times Cited Count:13 Percentile:47.24(Environmental Sciences)

Journal Articles

Three-layer GSO depth-of-interaction detector for high-energy gamma camera

Yamamoto, Seiichi*; Watabe, Hiroshi*; Kawachi, Naoki; Fujimaki, Shu; Kato, Katsuhiko*; Hatazawa, Jun*

Nuclear Instruments and Methods in Physics Research A, 743, p.124 - 129, 2014/04

 Times Cited Count:9 Percentile:62.45(Instruments & Instrumentation)

Journal Articles

RI imaging method to analyze a process of radiocesium contamination of plants and to develop phytoremediation techniques

Kawachi, Naoki; Yin, Y.-G.; Suzui, Nobuo; Ishii, Satomi; Watabe, Hiroshi*; Yamamoto, Seiichi*; Fujimaki, Shu

JAEA-Review 2013-059, JAEA Takasaki Annual Report 2012, P. 100, 2014/03

Journal Articles

Tackling contamination of farmland by using NaI(Tl) spectrometer and gamma camera

Yin, Y.-G.; Suzui, Nobuo; Kawachi, Naoki; Yamaguchi, Mitsutaka; Tanoi, Keitaro*; Ishii, Satomi; Nakanishi, Tomoko*; Chino, Mitsuo*; Nakamura, Shinichi*; Watabe, Hiroshi*; et al.

Hoshasen To Sangyo, (133), p.45 - 48, 2012/12

no abstracts in English

Journal Articles

Imaging of carbon translocation to fruit using carbon-11-labeled carbon dioxide and positron emission tomography

Kawachi, Naoki; Kikuchi, Kaori*; Suzui, Nobuo; Ishii, Satomi; Fujimaki, Shu; Ishioka, Noriko; Watabe, Hiroshi*

IEEE Transactions on Nuclear Science, 58(2), p.395 - 399, 2011/04

 Times Cited Count:16 Percentile:78.41(Engineering, Electrical & Electronic)

Journal Articles

Imaging for carbon translocation to a fruit with $$^{11}$$CO$$_{2}$$ and positron emission tomography

Kawachi, Naoki; Kikuchi, Kaori*; Watabe, Hiroshi*; Suzui, Nobuo; Ishii, Satomi; Ishioka, Noriko; Fujimaki, Shu

JAEA-Review 2009-041, JAEA Takasaki Annual Report 2008, P. 101, 2009/12

Journal Articles

Imaging for carbon translocation to a fruit of tomato with carbon-11-labeled carbon dioxide and positron emission tomography

Kawachi, Naoki; Kikuchi, Kaori*; Suzui, Nobuo; Ishii, Satomi; Fujimaki, Shu; Ishioka, Noriko; Watabe, Hiroshi*

Proceedings of 1st International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and their Applications (ANIMMA 2009) (USB Flash Drive), 5 Pages, 2009/06

Journal Articles

Comprehensive cost estimation method for decommissioning

Kudo, Kenji; Kawatsuma, Shinji; Rindo, Hiroshi; Watabe, Kozo; Tomii, Hiroyuki; Shiraishi, Kunio; Yagi, Naoto; Fukushima, Tadashi; Zaitsu, Tomohisa

Proceedings of 14th International Conference on Nuclear Engineering (ICONE-14) (CD-ROM), 8 Pages, 2006/07

Japan Atomic Energy Research Institute (JAERI) played a leading role in basic research in the field of atomic energy research and development, while Japan Nuclear Cycle Development Institute (JNC) did a major role in FBR cycle development and high level waste disposal. Following the Government's decision in December 2001, JAERI and JNC was merged as of October 1st, 2005. The new organization, Japan Atomic Energy Agency (JAEA), is an institute for comprehensive R&D for atomic energy, and is the largest research and development institute among Governmental R&D organizations. Its missions are basic research on atomic energy, R&D for nuclear fuel cycle, decommissioning of own facilities and disposal of waste, contribution to safety and non-proliferation, etc. The JAEA owns a number of nuclear facilities: research reactors such as JRR-2 and Joyo, prototype reactors such as ATR "Fugen" and FBR "Monju", fuel cycle plants such as Uranium Enrichment Demonstration Plant at Ningyo-Toge, MOX fuel plants at Tokai, Reprocessing Plant at Tokai, and Hot Laboratories such as JRTF and FMF. As a part of preparation of the mergence, JNC and JAERI have jointly developed a comprehensive cost estimation method for decommissioning, based on decommissioning and refurbishing experiences of JAERI and JNC. This method involves more estimation parameters from typical decommissioning activities than before, so as to make it more reliable. JAERI and JNC have estimated the total cost for decommissioning by using this method, and concluded that the cost would be 600 billion yen (approx. 5 billion USD).

Journal Articles

Cost estimation method for decommissioning of nuclear facilities

Tomii, Hiroyuki; Matsuo, Kiyoshi*; Shiraishi, Kunio; Watabe, Kozo; Saiki, Hideo*; Kawatsuma, Shinji*; Rindo, Hiroshi*; Zaitsu, Tomohisa*

Dekomisshoningu Giho, (31), p.11 - 20, 2005/03

no abstracts in English

Journal Articles

Cost estimation method for decommissioning of nuclear facilities

Tomii, Hiroyuki*; Matsuo, Kiyoshi*; Shiraishi, Kunio*; Watabe, Kozo*; Saiki, Hideo; Kawatsuma, Shinji; Rindo, Hiroshi; Zaitsu, Tomohisa

Dekomisshoningu Giho, (31), p.11 - 20, 2005/03

Japanese Government decided that Japan Atomic Energy Research Institute ( JAERI ) and Japan Nuclear Cycle Development Institute ( JNC ) shall be consolidated to a New rganization as of October 2005, which organization would be an Institute for comprehensive research and development for atomic.Through the preparation for unification, JAERI and JNC have been developing the Decommissioning program for own facilities, estimating decommissioning cost and the amount of waste from the decommissioning, and developing Management Program. Planning the Decommissioning program, it is important to estimate decommissioning cost effectively, because JAERI and JNC retain about 230 nuclear facilities which are reactors, fuel cycle facilities and research facilities. Then the decommissioning cost estimation method has developed based on several dismantling and replacement experiences. This method has adopted more estimation fomulae for decommissioning various works than ever, so as to be more reliable. And decommissioning cost for the facilities has estimated under the common condition. This method would be improved, reflecting future nuclear facilities dismantling and replacement events.This paper shows the cost estimation method for nuclear facilities and cost evaluation result for about 230 facilities of both JAERI and JNC.

JAEA Reports

Parallelization for first principles molecular dynamics programs

Watabe, Hiroshi*; Kobayashi, Kazuaki*; Arai, Masao*

JAERI-Data/Code 2000-019, p.33 - 0, 2000/03

JAERI-Data-Code-2000-019.pdf:1.54MB

no abstracts in English

Journal Articles

Parallelization for first principles electronic state calculation program

Watabe, Hiroshi*; Oguchi, Tamio*

Nihon Keisan Kogakkai Rombunshu, 2(1), p.63 - 65, 1997/05

no abstracts in English

JAEA Reports

Additional Groundwater Sampling and Analysis in the Investigation of Deep Groundwater (DH-15 Hole)

Hama, Hiroshi*; Yamada, Tsuyoshi*; Ide, Mitsuyoshi*; Takahashi, Eiichiro*; Yamamoto, Katsuya*; Nakajima, Toshihide*; Watabe, Takeo*

JNC TJ7440 2005-074, 270 Pages, 1995/05

JNC-TJ7440-2005-074.PDF:17.59MB
JNC-TJ7440-2005-074(errata).pdf:0.08MB

In 1997, DH-5 hole was drilled at P.N.C.(present J.N.C.) Toki Branch of Tono Geoscience Centr in Gifu prefecture. The borehole was drilled to a depth of 502.3 meters in Toki granite in order to investigate the deep groundwater. This report describes the investigation of the groundwater conducted at depth from 323.8 to 330.8 meters to make clear geological, hydrogeological and geochemical characteristics of study area. The investigation includes the following items;i) Sampling of the groundwaterii) Measurement of physical chemistry parameters of the groundwater in the borehole iii) Chemicaal analysis of the main composition of the groundwater during the continuous samplingiv) Chemical analysis of the groundwater It has become clear the following points;* The physical chemistry parameters of groundwater was alkalic, low deoxidize and buffer ability. There were few total ions and sulfide ions in the groundwater.* The isotopic analysis showed that the groundwater was regarded as rainwater in origin on the side of the Pacific Ocean and was relatively young with the age of a few decades.* According to the tri-linear diagram, the groundwater was classified into Ca(HCO$$_{3)}$$$$_{2}$$type. Based on hydrochemical facies, the groundwater was classified into Ca$$_{2}$$sup+ Na$$^{+,}$$and HCO$$_{3-}$$Cl$$^{-}$$SO$$_{4}$$$$^{2}$$$$^{-}$$in the cation and anion facies, respectively.* Nitrite oxidizing bacteria, nitrite reducing bacteria and nitrate reducing bacteria were detected in the groundwater by the bacteria analysis.

Oral presentation

Three-dimensional imaging of carbon translocation to fruit with $$^{11}$$CO$$_{2}$$ and positron emission tomography

Kawachi, Naoki; Suzui, Nobuo; Ishii, Satomi; Ito, Sayuri; Ishioka, Noriko; Fujimaki, Shu; Kikuchi, Kaori*; Watabe, Hiroshi*

no journal, , 

no abstracts in English

Oral presentation

3-dimensional imaging for carbon translocation to a fruit of tomato with $$^{11}$$CO$$_{2}$$ and PET

Kawachi, Naoki; Suzui, Nobuo; Ishii, Satomi; Ito, Sayuri; Ishioka, Noriko; Fujimaki, Shu; Kikuchi, Kaori*; Watabe, Hiroshi*

no journal, , 

no abstracts in English

Oral presentation

Analysis by using the molecular imaging method for dynamics of radiocesium from the accident of Fukushima Dai-ichi Nuclear Power Plant

Kawachi, Naoki; Yin, Y.-G.; Suzui, Nobuo; Watabe, Hiroshi*; Yamamoto, Seiichi*; Fujimaki, Shu

no journal, , 

no abstracts in English

42 (Records 1-20 displayed on this page)