Abstract:

Based on the gamma-ray spectrometry data obtained from CE-1, this paper deals with the measured raw data and gets the gamma-ray spectrum data for each grid of 5°×5°. Twelve gammaray spectrum curves at different locations, which stand for basalt, anorthosite, magnesiumrich rock and KREEP rock respectively, were selected for analysis; we found that the spectrum curves behave the similarity for the same kind of rock, and show differences for different kinds of rocks. The results show that the elemental characteristic peaks varied with the different kinds of rocks; for basalt the characteristic peaks mainly express the elements of Th, K, Si, Ca, C, Fe, and Ti; for anorthosite the characteristic peaks represent the elements of U, Ca, C, Mg, Al, and Mn; the characteristic peaks of KREEP rock are high content of K, Th, U, Si, Ca, and Fe and low content of C and Al; for magnesiumrich rock the characteristic peaks show the characteristics of high content of K, Mg, Th, and Fe and low content of U, Si, Ca, and Cl. In conclusion, the energies of elemental characteristic peaks for identifying different lunar rocks are suggested, and these results can provide the basis for quantitative elemental analysis of lunar rocks.

Key words: gamma-ray spectrometry of CE-1, lunar rock, basalt, anorthosite, magnesiumrich rock, KREEP rock, gamma-ray spectrum curve characteristics