Germanium gamma-ray spectrometer on selene (kaguya)

Naoyuki Yamashita*, Nobuyuki Hasebe, Eido Shibamura, Takashi Miyaohi, Takeshi Takashima, Masanori Kobayashi, Osamu Okudaira, Shingo Kobayashi, Makoto Hareyama, Yuzuru Karouji, Satoshi Kodaira, Kunitomo Sakurai, Kazuya Iwabuchi, Kanako Hayatsu, Shinpei Nemoto, Mitsuru Ebihara, Takeshi Hihara, Claude D'Uston, Sylvestre Maurice, Olivier GasnaultOlivier Forni, Benedicte Diez, Robert C. Reedy, Kyeong J. Kim

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The Japanese lunar explorer SELENE was launched from Tanegashima Space Center on September 14, 2007. It consists of a main orbiter KAGUYA at 100 km altitude and two daughter satellites (relay satellite OKINA and VRAD satellite OUNA) with 14 scientific instruments. The high precision gamma-ray spectrometer (GRS) on KAGUYA measures 200 keV - 12 MeV gamma rays to determine the elemental composition of the lunar surface. The GRS is composed of a large Ge crystal as a main detector and massive bismuth germinate (BGO) crystals and a plastic scintillator as anticoincidence detectors. The Ge detector is cooled by a Stirling cryocooler below 90 K during the observation. After successful launch of the spacecraft and initial checkouts, the GRS started the nominal observation on December 21, 2007, and the temperatures and counting rates of the GRS were confirmed to be stable. Energy spectra of gamma rays with a good energy resolution are being obtained over the lunar surface, which will allow us to make global maps of the elemental abundances of the Moon soon.

Original languageEnglish
Pages (from-to)153-156
Number of pages4
Journaljournal of the physical society of japan
Issue numberSUPPL. A
Publication statusPublished - 2009
Externally publishedYes


  • Abundance
  • Elemental composition
  • GRS
  • Gamma ray spectrometer
  • Ge
  • Germanium
  • Lunar
  • Moon

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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