The high precision gamma-ray spectrometer for lunar polar orbiter SELENE

Nobuyuki Hasebe*, N. Yamashita, O. Okudaira, S. Kobayashi, H. Yamamoto, T. Ishizaki, K. Hirano, K. Sakurai, T. Miyachi, M. Miyajima, M. Fujii, M. N. Kobayashi, T. Takashima, E. Shibamura, O. Gasnault, S. Maurice, C. d'Uston, R. Reedy, M. Grande

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    19 Citations (Scopus)


    The high precision gamma-ray spectrometer (GRS) is scheduled to be launched on the lunar polar orbiter of the SELENE mission in 2007. The GRS consists of a large Ge crystal as a main detector and massive bismuth germanate crystals as an anticoincidence detector. A Stirling cryocooler was adopted in cooling the Ge detector. The flight model of SELENE GRS has been completed and an energy resolution of 3.0 keV (FWHM) at 1.332 MeV has been achieved. The spectrometer aims to observe nuclear line gamma rays emitted from the lunar surface in a wide energy range from 100 keV to 12 MeV for one year and more to obtain chemical composition on the entire lunar surface. The gamma-ray data enable us to study lunar geoscience problems including crust and mantle composition, and volatile reservoirs at polar regions.

    Original languageEnglish
    Pages (from-to)323-330
    Number of pages8
    JournalAdvances in Space Research
    Issue number2
    Publication statusPublished - 2008 Jul 18


    • Chemical composition
    • Gamma-ray
    • Ge detector
    • GRS
    • Lunar
    • Moon
    • Planetary spectroscopy
    • SELENE
    • Stirling cooler

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics


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