Germanium detector with Stirling cryocooler for lunar gamma-ray spectroscopy

Masanori Kobayashi*, Nobuyuki Hasebe, Takuji Hiramoto, Takashi Miyachi, Satoshi Murasawa, Hiroyuki Okada, Osamu Okudaira, Naoyuki Yamashita, Alexey A. Berezhnoy, Eido Shibamura, Takeshi Takashima, Claude D'Uston, Katsuhiro Narasaki, Keisuke Tsurumi, Hiroshi Kaneko, Michio Nakazawa, Kunishiro Mori, Masayuki Fujii

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    18 Citations (Scopus)


    The gamma-ray spectrometer (GRS) of Japanese lunar polar orbiter SELENE uses a Ge detector for the first time on a lunar mission. This spectrometer will observe lunar gamma rays for 1 year or more to determine chemical composition over the entire lunar surface. For cooling the Ge detector, we adopted a Stirling cryocooler. The SELENE GRS flight model was completed and an energy resolution of 3.0 keV (FWHM) at 1.33 MeV was achieved. This paper describes the details of the detector-cryogenic system and its performance.

    Original languageEnglish
    Pages (from-to)401-410
    Number of pages10
    JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
    Issue number3
    Publication statusPublished - 2005 Aug 21


    • Gamma-ray spectroscopy
    • Germanium detector
    • Lunar mission
    • Stirling cryocooler

    ASJC Scopus subject areas

    • Instrumentation
    • Nuclear and High Energy Physics


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