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Journal Articles

Thermally altered subsurface material of asteroid (162173) Ryugu

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:27 Percentile:97.31(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 $$^{circ}$$C, similar to the surface. In contrast, thermophysical modeling indicates that radiative heating does not increase the temperature above 200 $$^{circ}$$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.

Journal Articles

Discussion on translational research of drug product for targeted alpha therapy, 2

Yano, Tsuneo*; Hasegawa, Koki*; Sato, Tatsuhiko; Hachisuka, Akiko*; Fukase, Koichi*; Hirabayashi, Yoko*

Iyakuhin Iryo Kiki Regyuratori Saiensu, 50(3), p.122 - 134, 2019/03

This report provides an overview of alpha-particle-emitting radiopharmaceuticals applied by micro-dosimetry.

Journal Articles

New utilization and promotion of RI

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 $$^{99}$$Mo and the silicon semiconductor on JMTR.

JAEA Reports

An Investigation on high-temperature irradiation test program on new ceramic materials

Ishino, Shiori*; Terai, Takayuki*; Oku, Tatsuo*; Arai, Taketoshi; Hayashi, Kimio; Ito, Hisayoshi; Yano, Toyohiko*; Motohashi, Yoshinobu*; *; *; et al.

JAERI-Review 99-019, 238 Pages, 1999/08


no abstracts in English

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