High-purity germanium gamma-ray spectrometer with stirling cycle cryocooler

M. N. Kobayashi*, Nobuyuki Hasebe, T. Miyachi, T. Doke, J. Kikuchi, H. Okada, A. Oka, O. Okudaira, H. Souri, N. Yamashita, E. Shibamura, T. Kashiwagi, T. Takashima, K. Narasaki, K. Tsurumi, K. Mori, C. d'Uston, S. Maurice, M. Grande, R. C. Reedy

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)


    The Japanese lunar polar orbiter SELENE carries a gamma-ray spectrometer which uses a high-purity Ge detector cooled to 80-90 K by a Stirling mechanical cooler. The Gamma-Ray Spectrometer (GRS) consists of a large volume n-type Ge detector (252 cc) as the main detector and bismuth-germanate (BGO) and plastic scintillators as an active shielding. The engineering model still maintains excellent energy resolution even after severe vibration testing. The Gamma-Ray Spectrometer will globally map of the Moon for the major elements of O, Mg, Al, Si, Ti, Fe, etc. and natural radioisotopes of K, Th and U with a high precision. The energy resolution of the GRS is such that it would identify prompt gamma-ray line from hydrogen and the location and the amount of ice, if it exists at the polar regions.

    Original languageEnglish
    Pages (from-to)1927-1931
    Number of pages5
    JournalAdvances in Space Research
    Issue number8
    Publication statusPublished - 2002

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics


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