Lunar gamma-ray observation by kaguya GRS

N. Hasebe; N. Yamashita; Y. Karouji; S. Kobayashi; M. Hareyama; S. Komatsu; K. Hayatsu; K. Nemoto; K. Iwabuchi; Y. Takeda; H. Nagaoka; K. Tsukada; J. Machida; O. Okudaira; S. Sakurai; E. Shibamura; M. N. Kobayashi; M. Ebihara; T. Hihara; T. Arai; T. Sugihara; H. Takeda; C. D'Uston; O. Gasnault; B. Diez; O. Forni; S. Maurice; R. C. Reedy; K. J. Kim

doi:10.1142/9789812838162_0005

Lunar gamma-ray observation by kaguya GRS

N. Hasebe, N. Yamashita, Y. Karouji^*, S. Kobayashi, M. Hareyama, S. Komatsu, K. Hayatsu, K. Nemoto, K. Iwabuchi, Y. Takeda, H. Nagaoka, K. Tsukada, J. Machida, O. Okudaira, S. Sakurai, E. Shibamura, M. N. Kobayashi, M. 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

^*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) was carried on the first Japan's large-scale lunar orbiter, SELENE (KAGUYA). The GRS employed a Ge detector with high energy resolution. Since the regular observation by the KAGUYA GRS started on December 14, 2007, gamma-ray data had been accumulated over the Moon. Many elements were identified: O, Mg, Al, Si, K, Ca, Ti, Fe, Th and U. The regular GRS observation at 100 km altitude let us create global distribution maps of chemical abundances on the lunar surface, which showed considerable regional variations. Special operations were conducted in December 2008 in order to measure background gamma rays from materials of the spacecraft body and the GRS detector itself, and to anneal the Ge crystal for about two days at 85 ± 5 degrees Celsius in order to recover the resolution of the Ge crystal that had been degraded due to radiation damage in space. Its energy resolution was improved to the level at the initial phase of the mission. Results from the special operations and regular observation of the Moon are described.

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	57-68
Number of pages	12
ISBN (Electronic)	9789812838162
ISBN (Print)	9812838155, 9789812838155
DOIs	https://doi.org/10.1142/9789812838162_0005
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_0005

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Hasebe, N., Yamashita, N., Karouji, Y., Kobayashi, S., Hareyama, M., Komatsu, S., Hayatsu, K., Nemoto, K., Iwabuchi, K., Takeda, Y., Nagaoka, H., Tsukada, K., Machida, J., Okudaira, O., Sakurai, S., Shibamura, E., Kobayashi, M. N., Ebihara, M., Hihara, T., ... Kim, K. J. (2010). Lunar gamma-ray observation by kaguya GRS. In Advances in Geosciences: Volume 19: Planetary Science (PS) (pp. 57-68). World Scientific Publishing Co.. https://doi.org/10.1142/9789812838162_0005

Hasebe, N, Yamashita, N, Karouji, Y, Kobayashi, S, Hareyama, M, Komatsu, S, Hayatsu, K, Nemoto, K, Iwabuchi, K, Takeda, Y, Nagaoka, H, Tsukada, K, Machida, J, Okudaira, O, Sakurai, S, Shibamura, E, Kobayashi, MN, 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 2010, Lunar gamma-ray observation by kaguya GRS. in Advances in Geosciences: Volume 19: Planetary Science (PS). World Scientific Publishing Co., pp. 57-68. https://doi.org/10.1142/9789812838162_0005

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abstract = "The high precision Gamma-Ray Spectrometer (GRS) was carried on the first Japan's large-scale lunar orbiter, SELENE (KAGUYA). The GRS employed a Ge detector with high energy resolution. Since the regular observation by the KAGUYA GRS started on December 14, 2007, gamma-ray data had been accumulated over the Moon. Many elements were identified: O, Mg, Al, Si, K, Ca, Ti, Fe, Th and U. The regular GRS observation at 100 km altitude let us create global distribution maps of chemical abundances on the lunar surface, which showed considerable regional variations. Special operations were conducted in December 2008 in order to measure background gamma rays from materials of the spacecraft body and the GRS detector itself, and to anneal the Ge crystal for about two days at 85 ± 5 degrees Celsius in order to recover the resolution of the Ge crystal that had been degraded due to radiation damage in space. Its energy resolution was improved to the level at the initial phase of the mission. Results from the special operations and regular observation of the Moon are described.",

author = "N. Hasebe and N. Yamashita and Y. Karouji and S. Kobayashi and M. Hareyama and S. Komatsu and K. Hayatsu and K. Nemoto and K. Iwabuchi and Y. Takeda and H. Nagaoka and K. Tsukada and J. Machida and O. Okudaira and S. Sakurai and E. Shibamura and Kobayashi, {M. N.} and M. Ebihara and T. Hihara and T. Arai and T. Sugihara and H. Takeda and C. D'Uston and O. Gasnault and B. Diez and O. Forni and S. Maurice and Reedy, {R. C.} and Kim, {K. J.}",

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doi = "10.1142/9789812838162_0005",

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T1 - Lunar gamma-ray observation by kaguya GRS

AU - Hasebe, N.

AU - Yamashita, N.

AU - Karouji, Y.

AU - Kobayashi, S.

AU - Hareyama, M.

AU - Komatsu, S.

AU - Hayatsu, K.

AU - Nemoto, K.

AU - Iwabuchi, K.

AU - Takeda, Y.

AU - Nagaoka, H.

AU - Tsukada, K.

AU - Machida, J.

AU - Okudaira, O.

AU - Sakurai, S.

AU - Shibamura, E.

AU - Kobayashi, M. N.

AU - Ebihara, M.

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 - 2010/1/1

Y1 - 2010/1/1

N2 - The high precision Gamma-Ray Spectrometer (GRS) was carried on the first Japan's large-scale lunar orbiter, SELENE (KAGUYA). The GRS employed a Ge detector with high energy resolution. Since the regular observation by the KAGUYA GRS started on December 14, 2007, gamma-ray data had been accumulated over the Moon. Many elements were identified: O, Mg, Al, Si, K, Ca, Ti, Fe, Th and U. The regular GRS observation at 100 km altitude let us create global distribution maps of chemical abundances on the lunar surface, which showed considerable regional variations. Special operations were conducted in December 2008 in order to measure background gamma rays from materials of the spacecraft body and the GRS detector itself, and to anneal the Ge crystal for about two days at 85 ± 5 degrees Celsius in order to recover the resolution of the Ge crystal that had been degraded due to radiation damage in space. Its energy resolution was improved to the level at the initial phase of the mission. Results from the special operations and regular observation of the Moon are described.

AB - The high precision Gamma-Ray Spectrometer (GRS) was carried on the first Japan's large-scale lunar orbiter, SELENE (KAGUYA). The GRS employed a Ge detector with high energy resolution. Since the regular observation by the KAGUYA GRS started on December 14, 2007, gamma-ray data had been accumulated over the Moon. Many elements were identified: O, Mg, Al, Si, K, Ca, Ti, Fe, Th and U. The regular GRS observation at 100 km altitude let us create global distribution maps of chemical abundances on the lunar surface, which showed considerable regional variations. Special operations were conducted in December 2008 in order to measure background gamma rays from materials of the spacecraft body and the GRS detector itself, and to anneal the Ge crystal for about two days at 85 ± 5 degrees Celsius in order to recover the resolution of the Ge crystal that had been degraded due to radiation damage in space. Its energy resolution was improved to the level at the initial phase of the mission. Results from the special operations and regular observation of the Moon are described.

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BT - Advances in Geosciences

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ER -

Lunar gamma-ray observation by kaguya GRS

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