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Kitazato, Kohei*; Milliken, R. E.*; Iwata, Takahiro*; Abe, Masanao*; Otake, Makiko*; Matsuura, Shuji*; Takagi, Yasuhiko*; Nakamura, Tomoki*; Hiroi, Takahiro*; Matsuoka, Moe*; et al.
Nature Astronomy (Internet), 5(3), p.246 - 250, 2021/03
Times Cited Count：44 Percentile：97.1(Astronomy & Astrophysics)Here we report observations of Ryugu's subsurface material by the Near-Infrared Spectrometer (NIRS3) on the Hayabusa2 spacecraft. Reflectance spectra of excavated material exhibit a hydroxyl (OH) absorption feature that is slightly stronger and peak-shifted compared with that observed for the surface, indicating that space weathering and/or radiative heating have caused subtle spectral changes in the uppermost surface. However, the strength and shape of the OH feature still suggests that the subsurface material experienced heating above 300 
C, similar to the surface. In contrast, thermophysical modeling indicates that radiative heating does not increase the temperature above 200 C at the estimated excavation depth of 1 m, even if the semimajor axis is reduced to 0.344 au. This supports the hypothesis that primary thermal alteration occurred due to radiogenic and/or impact heating on Ryugu's parent body.
Nakamura, Hideo; Arai, Kenji*; Oikawa, Hirohide*; Fujii, Tadashi*; Umezawa, Shigemitsu*; Abe, Yutaka*; Sugimoto, Jun*; Koshizuka, Seiichi*; Yamaguchi, Akira*
Proceedings of 16th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-16) (USB Flash Drive), p.5353 - 5366, 2015/08
Nishio, Satoshi; Ueda, Shuzo; Kurihara, Ryoichi; Kuroda, Toshimasa*; Miura, H.*; Sako, Kiyoshi*; Takase, Kazuyuki; Seki, Yasushi; Adachi, Junichi*; Yamazaki, Seiichiro*; et al.
Fusion Engineering and Design, 48(3-4), p.271 - 279, 2000/09
Times Cited Count：17 Percentile：71.94(Nuclear Science & Technology)no abstracts in English
Ishiyama, Shintaro; Baba, Shinichi; Fukaya, Kiyoshi; Eto, Motokuni; Akiba, Masato; Sato, Makoto*; Araki, Toshimitsu*; Yamaguchi, Seiji*; Yamazaki, Seiichiro*
Nihon Genshiryoku Gakkai-Shi, 42(7), p.669 - 677, 2000/07
no abstracts in English
Nishio, Satoshi; Ueda, Shuzo; Aoki, Isao; Kurihara, Ryoichi; Kuroda, Toshimasa*; Miura, H.*; Kunugi, Tomoaki; Takase, Kazuyuki; Seki, Yasushi; Shinya, K.*; et al.
Fusion Engineering and Design, 41, p.357 - 364, 1998/00
Times Cited Count：51 Percentile：95.4(Nuclear Science & Technology)no abstracts in English
; ; *; ; *; Kikuchi, Yasuyuki; ; ; *; *; et al.
JAERI-M 85-082, 352 Pages, 1985/07
no abstracts in English
*; *; *; *; ; Kondo, I.; ; ; *; Tsunematsu, Toshihide; et al.
JAERI-M 85-077, 203 Pages, 1985/07
no abstracts in English
Seki, Masahiro; *; *; ; *; *; *; *; *
JAERI-M 85-075, 177 Pages, 1985/07
no abstracts in English
Mitsumoto, Rika*; Okusa, Kyoichi; Tamayama, Kiyoshi; Shin, Seiichi
no journal, ,
no abstracts in English
Mitsumoto, Rika*; Okusa, Kyoichi; Tamayama, Kiyoshi; Shin, Seiichi*
no journal, ,
Maeda, Koji; Sasaki, Shinji; Ikusawa, Yoshihisa; Koyama, Shinichi; Maeda, Seiichiro
no journal, ,
no abstracts in English
Mitsui, Seiichiro; Sekiyama, Tomio; Kato, Mitsugu; Asazuma, Shinichiro; Kato, Hiroyasu*; Ueta, Shinzo*
no journal, ,
A huge volume of contaminated soils and wastes has been generated by off-site decontamination works in Fukushima and has been stored at temporary storage sites located near or at decontamination sites. The soils and wastes will be sequentially transferred to the Interim Storage Facility (ISF). According to a relevant law, the soils and wastes will be disposed at a final disposal site outside Fukushima within the next 30 years. The total volume of the contaminated soils which will be stored in the ISF is estimated to be up to 20 million cubic meters, thus reduction of its final disposal volume is vital to minimize various impacts of final disposal. In order to optimize final disposal outside Fukushima, the government will commence research and development on soil treatment techniques and use application of less-contaminated soil. As the one and only institution dedicated to the comprehensive R&D of nuclear energy-related technology in Japan, we will support the government efforts.
Nakamura, Hideo; Arai, Kenji*; Oikawa, Hirohide*; Umezawa, Shigemitsu*; Onuki, Akira*; Fujii, Tadashi*; Nishi, Yoshihisa*; Abe, Yutaka*; Sugimoto, Jun*; Koshizuka, Seiichi*; et al.
no journal, ,
no abstracts in English
Nakamura, Hideo; Arai, Kenji*; Oikawa, Hirohide*; Fujii, Tadashi*; Umezawa, Shigemitsu*; Onuki, Akira*; Nishi, Yoshihisa*; Abe, Yutaka*; Sugimoto, Jun*; Koshizuka, Seiichi*; et al.
no journal, ,
