Lunar gamma-ray observation by kaguya GRS

N. Hasebe, N. Yamashita, Y. Karouji*, S. Kobayashi, M. Hareyama, S. Komatsu, K. Hayatsu, K. Nemoto, K. Iwabuchi, Y. Takeda, H. Nagaoka, K. Tsukada, J. Machida, O. Okudaira, S. Sakurai, E. Shibamura, M. N. Kobayashi, M. Ebihara, T. Hihara, T. AraiT. Sugihara, H. Takeda, C. D'Uston, O. Gasnault, B. Diez, O. Forni, S. Maurice, R. C. Reedy, K. J. Kim


研究成果: Chapter

1 被引用数 (Scopus)


The high precision Gamma-Ray Spectrometer (GRS) was carried on the first Japan's large-scale lunar orbiter, SELENE (KAGUYA). The GRS employed a Ge detector with high energy resolution. Since the regular observation by the KAGUYA GRS started on December 14, 2007, gamma-ray data had been accumulated over the Moon. Many elements were identified: O, Mg, Al, Si, K, Ca, Ti, Fe, Th and U. The regular GRS observation at 100 km altitude let us create global distribution maps of chemical abundances on the lunar surface, which showed considerable regional variations. Special operations were conducted in December 2008 in order to measure background gamma rays from materials of the spacecraft body and the GRS detector itself, and to anneal the Ge crystal for about two days at 85 ± 5 degrees Celsius in order to recover the resolution of the Ge crystal that had been degraded due to radiation damage in space. Its energy resolution was improved to the level at the initial phase of the mission. Results from the special operations and regular observation of the Moon are described.

ホスト出版物のタイトルAdvances in Geosciences
ホスト出版物のサブタイトルVolume 19: Planetary Science (PS)
出版社World Scientific Publishing Co.
ISBN(印刷版)9812838155, 9789812838155
出版ステータスPublished - 2010 1月 1

ASJC Scopus subject areas

  • 地球惑星科学(全般)


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