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.
|Title of host publication||Advances in Geosciences: Volume 19: Planetary Science (PS)|
|Publisher||World Scientific Publishing Co.|
|Number of pages||8|
|ISBN (Print)||9812838155, 9789812838155|
|Publication status||Published - 2010 Jan 1|
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)