EXPECTED GAMMA-RAY EMISSION SPECTRA FROM THE LUNAR SURFACE AS A FUNCTION OF CHEMICAL COMPOSITION

摘要

The gamma-rays emitted from the moon or any similar body carry informa¬tion on the chemical composition of the surface layer. The elements most easily measured are K, U, Th and major elements such as O, Si, Mg and Fe. The ex¬pected fluxes of gamma-ray lines are calculated for four lunar compositions and one chondritic chemistry from a consideration of the important emission mec¬hanisms:-natural radioactivity, inelastic scatter, neutron capture, and induced radioactivity. The models used for cosmic-ray interactions are those of Reedy and Arnold (1972) and Lingenfelter et al (1972).