The ambient dose equivalent from lunar gamma-rays observed by Kaguya gamma-ray spectrometer

Y. Takeda; K. Hayatsu; S. Kobayashi; M. Hareyama; Nobuyuki Hasebe; S. Kodaira; K. J. Kim

doi:10.1142/9789812838162_0006

The ambient dose equivalent from lunar gamma-rays observed by Kaguya gamma-ray spectrometer

Y. Takeda^*, K. Hayatsu, S. Kobayashi, M. Hareyama, Nobuyuki Hasebe, S. Kodaira, K. J. Kim

^*Corresponding author for this work

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

Abstract

The gamma-ray spectrometer (GRS) onboard the lunar polar explorer, SELENE (KAGUYA), globally measured gamma rays emitted from the lunar surface. Using the gamma-ray data observed by the GRS, global map of ambient dose equivalent due to lunar gamma rays for the first time are obtained for the energies from 200 keV to 10 MeV. The dose due to gamma rays on the lunar surface during the period of 2008 at solar minimum of solar activity ranges from 2.58 to 4.30 mSv/yr, depending on the regions of the Moon, which give higher than that due to gamma rays from natural radioactivity isotopes at the Earth. It is found that the dose is high in mare regions, especially the Procellarum KREEP Terrain, where natural radioactive isotopes such as U, Th and K and major elements such as Fe and Ti are abundant.

Original language	English
Title of host publication	Advances in Geosciences: Volume 19: Planetary Science (PS)
Publisher	World Scientific Publishing Co.
Pages	69-76
Number of pages	8
ISBN (Electronic)	9789812838162
ISBN (Print)	9812838155, 9789812838155
DOIs	https://doi.org/10.1142/9789812838162_0006
Publication status	Published - 2010 Jan 1

ASJC Scopus subject areas

Earth and Planetary Sciences(all)

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10.1142/9789812838162_0006

Cite this

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abstract = "The gamma-ray spectrometer (GRS) onboard the lunar polar explorer, SELENE (KAGUYA), globally measured gamma rays emitted from the lunar surface. Using the gamma-ray data observed by the GRS, global map of ambient dose equivalent due to lunar gamma rays for the first time are obtained for the energies from 200 keV to 10 MeV. The dose due to gamma rays on the lunar surface during the period of 2008 at solar minimum of solar activity ranges from 2.58 to 4.30 mSv/yr, depending on the regions of the Moon, which give higher than that due to gamma rays from natural radioactivity isotopes at the Earth. It is found that the dose is high in mare regions, especially the Procellarum KREEP Terrain, where natural radioactive isotopes such as U, Th and K and major elements such as Fe and Ti are abundant.",

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AU - Takeda, Y.

AU - Hayatsu, K.

AU - Kobayashi, S.

AU - Hareyama, M.

AU - Hasebe, Nobuyuki

AU - Kodaira, S.

AU - Kim, K. J.

PY - 2010/1/1

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AB - The gamma-ray spectrometer (GRS) onboard the lunar polar explorer, SELENE (KAGUYA), globally measured gamma rays emitted from the lunar surface. Using the gamma-ray data observed by the GRS, global map of ambient dose equivalent due to lunar gamma rays for the first time are obtained for the energies from 200 keV to 10 MeV. The dose due to gamma rays on the lunar surface during the period of 2008 at solar minimum of solar activity ranges from 2.58 to 4.30 mSv/yr, depending on the regions of the Moon, which give higher than that due to gamma rays from natural radioactivity isotopes at the Earth. It is found that the dose is high in mare regions, especially the Procellarum KREEP Terrain, where natural radioactive isotopes such as U, Th and K and major elements such as Fe and Ti are abundant.

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The ambient dose equivalent from lunar gamma-rays observed by Kaguya gamma-ray spectrometer

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