Japan Aerospace Exploration Agency (JAXA)
Japan Aerospace Exploration Agency (JAXA)
Japan Aerospace Exploration Agency (JAXA)
Japan Aerospace Exploration Agency (JAXA)
Japan Aerospace Exploration Agency (JAXA)
出版者
宇宙航空研究開発機構(JAXA)
出版者（英）
Japan Aerospace Exploration Agency (JAXA)
雑誌名
宇宙航空研究開発機構特別資料: 第13回「宇宙環境シンポジウム」講演論文集
雑誌名(英)
JAXA Special Publication: Proceedings of the 13th Spacecraft Environment Symposium
The 13th Spacecraft Environment Symposium (November 1-2, 2016. National Institute of Information and Communications Technology), Koganei, Tokyo, Japan
抄録（英）
JAXA is planning future manned space missions following the International Space Station (ISS) mission, such as a long-term stay onboard lunar orbital station and exploration of the Moon and Mars. Outside the geomagnetic field, where the Moon/Mars missions will be performed, astronauts are exposed to high linear energy transfer (LET) radiations namely galactic cosmic rays (GCR) and solar energetic particles (SEP). As high-LET radiations cause significant biological damage, the development of radiation protection technologies is desired to safely carry out the future manned missions. Under this background, we undertake a study of space radiation shielding materials. In this paper, we introduce the PHITS (Particle and Heavy Ion Transport Code System) simulation results of the shielding effects of hydrogen rich or multi-layer materials. Hydrogen is known as the most effective element for space radiation shielding. Then, hydrogen storage materials were selected as a candidate of hydrogen-rich shielding material. The shielding effects of the hydrogen storage materials such as ammonia borane (NH3BH3) and lithium borohydride (LiBH4) against GCR/GCR+SEP were simulated by PHITS. As a result, the shielding effects of them were almost the same as polyethylene (PE), standard shielding material. Therefore, hydrogen storage materials are not more useful for space radiation shielding than PE. Additionally, the shielding effects of aluminium (Al, standard structure and shielding material for spacecraft)/resin 2-layer material against GCR/GCR+SEP were simulated by PHITS. Consequently, the shielding effects of Al/resin 2-layer material were higher than Al. This result suggests that materials consisting of low atomic number (Z) elements are effective for space radiation shielding.
内容記述
形態: カラー図版あり
内容記述（英）
Physical characteristics: Original contains color illustrations
宇宙放射線遮蔽材料の新規開発に向けたPHITSによる検討
AA1630038004.pdf
(1.25MB)
