Distributions of K and Th on the moon: The initial results from observations by selene GRS

Yuzuru Karouji; Nobuyuki Hasebe; Osamu Okudaira; Naoyuki Yamashita; Shingo Kobayashi; Makoto Hareyama; Takashi Miyachi; Kodaira Satoshi; Kazuya Iwabuchi; Kanako Hayatsu; Shinpei Nemoto; Yuko Takeda; Koichi Tsukada; Hiroshi Nagaoka; Masanori Kobayasi; Eido Shibamura; Mitsuru Ebihara; Takeshi Hihara; Tomoko Arai; Takamitsu Sugihara; Hiroshi Takeda; Claude D’Uston; Sylvestre Maurice; Olivier Gasnault; Olivier Forni; Benedicte Diez; Robert C. Reedy; Kyeong J. Kim; Takeshi Takashima; Yuichi Iijima; Hisashi Otake

doi:10.1142/9789812838162_0004

Distributions of K and Th on the moon: The initial results from observations by selene GRS

Yuzuru Karouji^*, Nobuyuki Hasebe, Osamu Okudaira, Naoyuki Yamashita, Shingo Kobayashi, Makoto Hareyama, Takashi Miyachi, Kodaira Satoshi, Kazuya Iwabuchi, Kanako Hayatsu, Shinpei Nemoto, Yuko Takeda, Koichi Tsukada, Hiroshi Nagaoka, Masanori Kobayasi, Eido Shibamura, Mitsuru Ebihara, Takeshi Hihara, Tomoko Arai, Takamitsu SugiharaHiroshi Takeda, Claude D’Uston, Sylvestre Maurice, Olivier Gasnault, Olivier Forni, Benedicte Diez, Robert C. Reedy, Kyeong J. Kim, Takeshi Takashima, Yuichi Iijima, Hisashi Otake

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Chapter

1 Citation (Scopus)

Abstract

The high precision gamma-ray spectrometer (GRS) onboard the Japanese lunar explorer, SELENE (KAGUYA) consists of a large Ge crystal as the main detector and massive BGO and plastic scintillators as anticoincidence detectors. After a series of initial health checks, it started regular observation officially on December 21, 2007. Energy spectra of lunar gamma rays were obtained by GRS with very good energy resolution being 0.6% at 1.46MeV over the lunar surface. Many peaks of gamma rays from major elements and natural radioactive elements in the lunar surface have been observed. Individual gamma-ray lines emitted from the lunar surface have been identified. Here, we report the initial results obtained practically during the period from December 14, 2007 to February 17, 2008. Global maps of K and Th gamma-ray intensities are reported using count rates in several energy bands.

Original language	English
Title of host publication	Advances in Geosciences
Subtitle of host publication	Volume 19: Planetary Science (PS)
Publisher	World Scientific Publishing Co.
Pages	43-56
Number of pages	14
ISBN (Electronic)	9789812838162
ISBN (Print)	9812838155, 9789812838155
DOIs	https://doi.org/10.1142/9789812838162_0004
Publication status	Published - 2010 Jan 1
Externally published	Yes

ASJC Scopus subject areas

Earth and Planetary Sciences(all)

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10.1142/9789812838162_0004

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Karouji, Y., Hasebe, N., Okudaira, O., Yamashita, N., Kobayashi, S., Hareyama, M., Miyachi, T., Satoshi, K., Iwabuchi, K., Hayatsu, K., Nemoto, S., Takeda, Y., Tsukada, K., Nagaoka, H., Kobayasi, M., Shibamura, E., Ebihara, M., Hihara, T., Arai, T., ... Otake, H. (2010). Distributions of K and Th on the moon: The initial results from observations by selene GRS. In Advances in Geosciences: Volume 19: Planetary Science (PS) (pp. 43-56). World Scientific Publishing Co.. https://doi.org/10.1142/9789812838162_0004

Karouji, Y, Hasebe, N, Okudaira, O, Yamashita, N, Kobayashi, S, Hareyama, M, Miyachi, T, Satoshi, K, Iwabuchi, K, Hayatsu, K, Nemoto, S, Takeda, Y, Tsukada, K, Nagaoka, H, Kobayasi, M, Shibamura, E, Ebihara, M, Hihara, T, Arai, T, Sugihara, T, Takeda, H, D’Uston, C, Maurice, S, Gasnault, O, Forni, O, Diez, B, Reedy, RC, Kim, KJ, Takashima, T, Iijima, Y & Otake, H 2010, Distributions of K and Th on the moon: The initial results from observations by selene GRS. in Advances in Geosciences: Volume 19: Planetary Science (PS). World Scientific Publishing Co., pp. 43-56. https://doi.org/10.1142/9789812838162_0004

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abstract = "The high precision gamma-ray spectrometer (GRS) onboard the Japanese lunar explorer, SELENE (KAGUYA) consists of a large Ge crystal as the main detector and massive BGO and plastic scintillators as anticoincidence detectors. After a series of initial health checks, it started regular observation officially on December 21, 2007. Energy spectra of lunar gamma rays were obtained by GRS with very good energy resolution being 0.6% at 1.46MeV over the lunar surface. Many peaks of gamma rays from major elements and natural radioactive elements in the lunar surface have been observed. Individual gamma-ray lines emitted from the lunar surface have been identified. Here, we report the initial results obtained practically during the period from December 14, 2007 to February 17, 2008. Global maps of K and Th gamma-ray intensities are reported using count rates in several energy bands.",

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T2 - The initial results from observations by selene GRS

AU - Karouji, Yuzuru

AU - Hasebe, Nobuyuki

AU - Okudaira, Osamu

AU - Yamashita, Naoyuki

AU - Kobayashi, Shingo

AU - Hareyama, Makoto

AU - Miyachi, Takashi

AU - Satoshi, Kodaira

AU - Iwabuchi, Kazuya

AU - Hayatsu, Kanako

AU - Nemoto, Shinpei

AU - Takeda, Yuko

AU - Tsukada, Koichi

AU - Nagaoka, Hiroshi

AU - Kobayasi, Masanori

AU - Shibamura, Eido

AU - Ebihara, Mitsuru

AU - Hihara, Takeshi

AU - Arai, Tomoko

AU - Sugihara, Takamitsu

AU - Takeda, Hiroshi

AU - D’Uston, Claude

AU - Maurice, Sylvestre

AU - Gasnault, Olivier

AU - Forni, Olivier

AU - Diez, Benedicte

AU - Reedy, Robert C.

AU - Kim, Kyeong J.

AU - Takashima, Takeshi

AU - Iijima, Yuichi

AU - Otake, Hisashi

PY - 2010/1/1

Y1 - 2010/1/1

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Distributions of K and Th on the moon: The initial results from observations by selene GRS

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