First results of high performance ge gamma-ray spectrometer onboard lunar orbiter selene (kaguya)

Nobuyuki Hasebe, E. Shibamijra, T. Miyaohi, T. Takashima, M. N. Kobayashi, O. Okijdaira, N. Yamashita, S. Kobayashi, Y. Karojjji, M. Hareyama, S. Kodaira, Shinichi Komatsu, K. Hayatsjj, K. Iwabuchi, S. Nemoto, K. Sakurai, M. Miyajima, Mitsuru Ebihara, T. Hihara, T. AraiT. Sugihara, H. Takeda, C. D'Uston, O. Gasnault, B. Diez, O. Forni, S. Maurice, R. C. Reedy, K. J. Kim

    Research output: Contribution to journalArticle

    17 Citations (Scopus)

    Abstract

    The high precision gamma-ray spectrometer (GRS) is carried on the first Japan's large- scaled lunar explorer, SELENE (KAGUYA), successfully launched by the H-IIA rocket on Sep. 14, 2007. The GRS consists of a large Ge crystal as a main detector and massive bismuth germanate crystals and a plastic scintillator as anticoincidence detectors. After a series of initial health check of the GRS, it started a regular observation on December 21, 2007. Energy spectra including many clear peaks of major elements and trace elements on the lunar surface have been measured by the GRS. Global measurement of thorium counting rate on the lunar surface is presented. The region showing the highest count rate of thorium extends from Kepler to Fra Mauro region in the Procellarum. And Apennine Bench and Aristillus region and the northwestern region of Mare Imbrium are high in thorium count rate. Second high count rate region is located in the South Pole-Aitken basin of the farside. Arago and Compton/Belkovich craters are also enriched in thorium. The initial results observed by GRS during the period from Dec. 21, 2007 to Feb. 17, 2008 is reviewed.

    Original languageEnglish
    Pages (from-to)18-25
    Number of pages8
    JournalJournal of the Physical Society of Japan
    Volume78
    Issue numberSUPPL. A
    Publication statusPublished - 2009

    Fingerprint

    Lunar Orbiter
    gamma ray spectrometers
    thorium
    lunar surface
    anticoincidence detectors
    rockets
    trace elements
    craters
    bismuth
    scintillation counters
    seats
    health
    crystals
    Japan
    counting
    energy spectra
    poles
    plastics
    detectors

    Keywords

    • Chemical composition
    • Formation and evolution of the moon
    • Gamma-ray spectroscopy
    • Lunar polar orbiter
    • SELENE (KAGUYA)

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Hasebe, N., Shibamijra, E., Miyaohi, T., Takashima, T., Kobayashi, M. N., Okijdaira, O., ... Kim, K. J. (2009). First results of high performance ge gamma-ray spectrometer onboard lunar orbiter selene (kaguya). Journal of the Physical Society of Japan, 78(SUPPL. A), 18-25.

    First results of high performance ge gamma-ray spectrometer onboard lunar orbiter selene (kaguya). / Hasebe, Nobuyuki; Shibamijra, E.; Miyaohi, T.; Takashima, T.; Kobayashi, M. N.; Okijdaira, O.; Yamashita, N.; Kobayashi, S.; Karojjji, Y.; Hareyama, M.; Kodaira, S.; Komatsu, Shinichi; Hayatsjj, K.; Iwabuchi, K.; Nemoto, S.; Sakurai, K.; Miyajima, M.; Ebihara, Mitsuru; Hihara, T.; Arai, T.; Sugihara, T.; Takeda, H.; D'Uston, C.; Gasnault, O.; Diez, B.; Forni, O.; Maurice, S.; Reedy, R. C.; Kim, K. J.

    In: Journal of the Physical Society of Japan, Vol. 78, No. SUPPL. A, 2009, p. 18-25.

    Research output: Contribution to journalArticle

    Hasebe, N, Shibamijra, E, Miyaohi, T, Takashima, T, Kobayashi, MN, Okijdaira, O, Yamashita, N, Kobayashi, S, Karojjji, Y, Hareyama, M, Kodaira, S, Komatsu, S, Hayatsjj, K, Iwabuchi, K, Nemoto, S, Sakurai, K, Miyajima, M, Ebihara, M, Hihara, T, Arai, T, Sugihara, T, Takeda, H, D'Uston, C, Gasnault, O, Diez, B, Forni, O, Maurice, S, Reedy, RC & Kim, KJ 2009, 'First results of high performance ge gamma-ray spectrometer onboard lunar orbiter selene (kaguya)', Journal of the Physical Society of Japan, vol. 78, no. SUPPL. A, pp. 18-25.
    Hasebe N, Shibamijra E, Miyaohi T, Takashima T, Kobayashi MN, Okijdaira O et al. First results of high performance ge gamma-ray spectrometer onboard lunar orbiter selene (kaguya). Journal of the Physical Society of Japan. 2009;78(SUPPL. A):18-25.
    Hasebe, Nobuyuki ; Shibamijra, E. ; Miyaohi, T. ; Takashima, T. ; Kobayashi, M. N. ; Okijdaira, O. ; Yamashita, N. ; Kobayashi, S. ; Karojjji, Y. ; Hareyama, M. ; Kodaira, S. ; Komatsu, Shinichi ; Hayatsjj, K. ; Iwabuchi, K. ; Nemoto, S. ; Sakurai, K. ; Miyajima, M. ; Ebihara, Mitsuru ; Hihara, T. ; Arai, T. ; Sugihara, T. ; Takeda, H. ; D'Uston, C. ; Gasnault, O. ; Diez, B. ; Forni, O. ; Maurice, S. ; Reedy, R. C. ; Kim, K. J. / First results of high performance ge gamma-ray spectrometer onboard lunar orbiter selene (kaguya). In: Journal of the Physical Society of Japan. 2009 ; Vol. 78, No. SUPPL. A. pp. 18-25.
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    abstract = "The high precision gamma-ray spectrometer (GRS) is carried on the first Japan's large- scaled lunar explorer, SELENE (KAGUYA), successfully launched by the H-IIA rocket on Sep. 14, 2007. The GRS consists of a large Ge crystal as a main detector and massive bismuth germanate crystals and a plastic scintillator as anticoincidence detectors. After a series of initial health check of the GRS, it started a regular observation on December 21, 2007. Energy spectra including many clear peaks of major elements and trace elements on the lunar surface have been measured by the GRS. Global measurement of thorium counting rate on the lunar surface is presented. The region showing the highest count rate of thorium extends from Kepler to Fra Mauro region in the Procellarum. And Apennine Bench and Aristillus region and the northwestern region of Mare Imbrium are high in thorium count rate. Second high count rate region is located in the South Pole-Aitken basin of the farside. Arago and Compton/Belkovich craters are also enriched in thorium. The initial results observed by GRS during the period from Dec. 21, 2007 to Feb. 17, 2008 is reviewed.",
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    AU - Hasebe, Nobuyuki

    AU - Shibamijra, E.

    AU - Miyaohi, T.

    AU - Takashima, T.

    AU - Kobayashi, M. N.

    AU - Okijdaira, O.

    AU - Yamashita, N.

    AU - Kobayashi, S.

    AU - Karojjji, Y.

    AU - Hareyama, M.

    AU - Kodaira, S.

    AU - Komatsu, Shinichi

    AU - Hayatsjj, K.

    AU - Iwabuchi, K.

    AU - Nemoto, S.

    AU - Sakurai, K.

    AU - Miyajima, M.

    AU - Ebihara, Mitsuru

    AU - Hihara, T.

    AU - Arai, T.

    AU - Sugihara, T.

    AU - Takeda, H.

    AU - D'Uston, C.

    AU - Gasnault, O.

    AU - Diez, B.

    AU - Forni, O.

    AU - Maurice, S.

    AU - Reedy, R. C.

    AU - Kim, K. J.

    PY - 2009

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    KW - Chemical composition

    KW - Formation and evolution of the moon

    KW - Gamma-ray spectroscopy

    KW - Lunar polar orbiter

    KW - SELENE (KAGUYA)

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