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Gamma-ray spectrometer(GRS) is one of the main payloads on the Chang’E-1(CE-1) lunar probe,mainly aimed to detect the elemental abundances and distributions on the lunar surface.At 03:58 on 28 November 2007,it performed the first observation of the lunar gamma rays.As of 24 October 2008,2105 h of effective gamma rays spectra had been acquired by CE-1 GRS,which covers the whole surface of the moon.This paper mainly describes the data processing procedures and methods of deriving the elemental abundances by using the CE-1 GRS time series corrected spectra: first,to bin data into pixels for mapping;then,to perform a background deduction of the cumulative spectra and obtain a peak area of the elements;and finally,to use the elemental abundances inversion model to produce the elemental abundances.Based on these processing methods,the global abundance maps of U,K,and Th at a 5°×5°equal-area pixel are acquired by CE-1 GRS data.The paper gives a preliminary analysis of the uncertainties of the elemental abundances.
Gamma-ray spectrometer (GRS) is one of the main payloads on the Chang’E-1 (CE-1) lunar probe, mainly aimed at detecting the elemental abundances and distributions on the lunar surface. At 03:58 on 28 November 2007 , it performed the first observation of the lunar gamma rays. As of 24 October 2008, 2105 h of effective gamma rays spectra had been acquired by CE-1 GRS, which covers the whole surface of the moon. This paper mainly describes the data processing procedures and methods of deriving the elemental abundances by using the CE-1 GRS time series corrected spectra: first, to bin data into pixels for mapping; then, to perform a background deduction of the cumulative spectra and obtaining a peak area of the elements; and finally, to use the elemental abundances inversion model to produce the elemental abundances. Based on these processing methods, the global abundance maps of U, K, and Th at a 5 ° × 5 ° equal-area pixels are acquired by CE-1 GRS data. The paper gives a preliminary analysis of the uncertainties of the elemental abundances.