[2Ap01-12] Symposium

[2Ap05] Lunar science based on radiation spectroscopy

*Masayuki Naito¹, Nobuyuki Hasebe² (1. National Institutes for Quantum and Radiological Science and Technology, 2. Waseda University)

Neutrons and gamma-rays are produced in lunar surface through interactions of high energy particles such as galactic cosmic rays and solar energetic particle with lunar material nuclei. These radiations reflect the elemental composition of lunar materials within ~1 km depth. Radiation spectroscopy by lunar orbiters of Lunar Prospector and Kaguya (SELENE) has obtained abundances of lunar elements to discuss lunar science. Recently, the Moon is an important target of missions for space resource utilization. Some neutron measurements imply concentration of hydrogen at lunar polar regions. Hydrogen is a potential resource as water for human missions and fuels for deep space missions. Some missions to explore the abundance and chemical forms of hydrogen are under preparation for future lunar resource utilization. Lunar science by the radiation spectroscopy and development of future radiation spectrometer will be presented.