Developments of Lunar Gamma-ray Detection
Gamma rays are produced in the lunar surface by the decay of long-lived radioactive elements and by cosmic ray interactions.Because the atmosphere is weak,gamma rays can be observed on lunar orbit.Gamma-ray spectroscopy data are used to determine global maps of the elemental composition on the lunar surface.According to maps of the abundance of major elements,we can present along with their geochemical interpretation.Gamma-ray spectrometer(GRS) is an indispensable part of lunar satellites,USA and Japan have sent different kinds of GRS into the sky.Gamma-ray spectroscopy data obtained by Chinese first lunar mission Chang' E-1 can help people to do analysis and to detect the entire lunar surface.