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Volume 60 Supplement 4

Special Issue: Lunar Science with the SELENE “Kaguya” Mission-Prelaunch Studies-

Gamma-ray spectrometer (GRS) for lunar polar orbiter SELENE

Earth, Planets and Space volume 60, pages 299–312 (2008)Cite this article

Abstract

The high-precision gamma-ray spectrometer (GRS) on the lunar polar orbiter SELENE is designed to measure 200 keV—12 MeV gamma rays in order to determine elemental compositions of the lunar surface. The GRS consists of a large germanium (Ge) crystal as a main detector and a massive bismuth germanate crystal and a plastic scintillator as anticoincidence detectors. The Ge detector is cooled by a Stirling cryocooler with its compressor attached to a passive radiator facing the cold space. The cooling system maintains the Ge detector below 90 K during the observation. The flight model of the GRS has achieved an energy resolution of 3.0 keV (FWHM) at 1333 keV. Energy spectra obtained by the GRS will show sharp gamma-ray lines whose energies identify the elements and whose intensities determine the concentrations of the elements, permitting global mapping of the elemental abundances in the sub-surface of the Moon. The elemental maps obtained by the GRS with such high-energy resolution enable us to study lunar geoscience problems.

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Authors and Affiliations

  1. Research Institute for Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo, 169-8555, Japan

    Nobuyuki Hasebe, Takashi Miyachi, Osamu Okudaira, Naoyuki Yamashita, Shingo Kobayashi, Takeshi Ishizaki, Kunitomo Sakurai, Mitsuhiro Miyajima & Masayuki Fujii

  2. College of Health Science, Saitama Prefectural University, 820, San’nomiya, Koshigaya, Saitama, 343-8540, Japan

    Eido Shibamura

  3. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1, Yoshinodai, Sagamihara, Kanagawa, 229-8510, Japan

    Takeshi Takashima

  4. Nippon Medical School, 2-297-2, Kosugicho, Nakaharaku, Kawasaki, 211-0063, Japan

    Masanori Kobayashi

  5. Niihama Works, Sumitomo Heavy Industries Ltd., 5-2, soubirakicho, Niihama, Ehime, 792-8588, Japan

    Keisuke Narasaki, Shigeki Takai & Katsuhiro Tsurumi

  6. Isesaki Works, Meisei Electric Co., Ltd., 2223 Naganumacho, Isesakishi, Gunma, 372-8585, Japan

    Hiroshi Kaneko & Michio Nakazawa

  7. Clear Pulse Co., Ltd., 6-25-17, Chuo, Ohta-ku, Tokyo, 143-0024, Japan

    Kunishiro Mori

  8. Centre d’Etude Spatiale des Rayonnements, Univ. Paul Sabatier, CNRS, 9 avenue Roche, 31400, Toulouse, France

    Olivier Gasnault, Sylvestre Maurice & Claude d’Uston

  9. Institute of Meteorites, Univ. of New Mexico, Albuquerque, NM, 87131-1126, USA

    Robert C. Reedy

  10. Institute of Mathematical and Physical Sciences, University of Wales, Aberystwyth, Ceredigion, SY23 3BZ, Wales, UK

    Manuel Grande

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  1. Nobuyuki Hasebe
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Correspondence to Shingo Kobayashi.

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Hasebe, N., Shibamura, E., Miyachi, T. et al. Gamma-ray spectrometer (GRS) for lunar polar orbiter SELENE. Earth Planet Sp 60, 299–312 (2008). https://doi.org/10.1186/BF03352795

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