文章基本信息

标题：Complexities of gamma-ray line intensities from the lunar surface
其他标题：Complexities of gamma-ray line intensities from the lunar surface
本地全文：下载
作者：Naoyuki Yamashita ; Nobuyuki Hasebe ; Takashi Miyachi 等
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2008
卷号：60
期号：4
页码：313-319
DOI：10.1186/BF03352796
出版社：Springer Verlag
摘要：Assuming different abundances of the Apollo lunar soil samples and the average spectrum of galactic cosmic ray protons, energy spectra of neutrons and gamma rays and emission rates of gamma-ray lines from major elements have been estimated by using the reviewed Monte Carlo simulation library Geant4 and nuclear data. Previously, such libraries were not able to reproduce gamma-ray lines properly for the planetary application. Results clearly show that the emission rate of gamma rays heavily depends not only on the chemical abundance but also neutron flux within the lunar subsurface. While the intensities of gamma-ray lines are mostly proportional to elemental abundances, the intensity per unit elemental abundance can vary. Such a complex correlation is attributed to the change in neutron flux within the lunar subsurface and petrological restriction of elemental variation.
关键词：Gamma ray ;neutron ;lunar and planetary spectroscopy ;moon ;GRS ;SELENE