嫦娥一号和嫦娥二号月球γ能谱解析
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摘要
为了从嫦娥系列绕月γ能谱测量实验获取月表γ能谱特征,应用CE1-GRS和CE2-GRSγ能谱2C级科学数据,首先从散射本底扣除后的谱线中提取出弱特征峰信息,然后对嫦娥系列仪器谱进行定性分析,推定月表存在的可能元素种类。结果表明:(1)从CE1-GRSγ能谱能识别U、Th、K、Fe、Mg、Si、Al和O等8种月表可能元素,从CE2-GRSγ能谱能识别U、Th、K、Fe、Mg、Si、Al、O、Ti和Ca等10种月表可能元素;(2)卫星绕行轨道距月表距离越近、探测器的能量分辨率越高,得到的月球轨道γ能谱将更精细,从而能获取更准确的月表元素种类及其分布特征。
To acquire the features of the lunar gamma spectra detected by the Chang' e-1( CE1) gamma ray spectrometer( GRS) and the Chang'e-2( CE2) gamma ray spectrometer( GRS) respectively,weak peak signals can be extracted in the scattering background subtracted spectra from the level 2C spectra data measured by the CE1-GRS and CE2-GRS. Then the lunar gamma spectra are made qualitative analysis,and the possible elements of the lunar surface are identified finally. The result shows that:( 1) U,Th,K,Fe,Mg,Si,Al and O on the lunar surface can be qualitatively determined in the CE1-GRS spectra; U,Th,K,Fe,Mg,Si,Al,O,Ti and Ca can be identified in the CE2-GRS spectra;( 2) the distance between the lunar orbit of the GRS and lunar surface for CE2-GRS is closer,the energy resolution of the detector is higher,the GRS can identify more element types and its distribution characteristics of the lunar surface.
To acquire the features of the lunar gamma spectra detected by the Chang' e-1( CE1) gamma ray spectrometer( GRS) and the Chang'e-2( CE2) gamma ray spectrometer( GRS) respectively,weak peak signals can be extracted in the scattering background subtracted spectra from the level 2C spectra data measured by the CE1-GRS and CE2-GRS. Then the lunar gamma spectra are made qualitative analysis,and the possible elements of the lunar surface are identified finally. The result shows that:( 1) U,Th,K,Fe,Mg,Si,Al and O on the lunar surface can be qualitatively determined in the CE1-GRS spectra; U,Th,K,Fe,Mg,Si,Al,O,Ti and Ca can be identified in the CE2-GRS spectra;( 2) the distance between the lunar orbit of the GRS and lunar surface for CE2-GRS is closer,the energy resolution of the detector is higher,the GRS can identify more element types and its distribution characteristics of the lunar surface.
引文
[1]Bradley L.Jolliff,Mark A.Wieczorek,Charles K.Shearer,and Clive R.Neal,et al.New views of the moon[M].New York:Mineralogical Society of America,2006:172-208.
[2]Reedy R C.Planetary gamma-ray spectroscopy[C]//U.S.Department of Energy and NASA.Proceedings of Ninth Lunar and Planetary Science Conference.New York:Pergamon Press,1978:2961-2984.
[3]Lawrence D J,Feldman W C,Barraclough B L,et al.High resolution measurements of absolute thorium abundance on the lunar surface[J].Geophysical Research letters,1999,26:2681-2684.
[4]舒双宝,常进,蔡明生,等.月球伽玛射线谱仪的研制及其性能[J].天文学报,2006,47(2):218-223.
[5]马涛,常进,张南,等.嫦娥二号伽玛射线谱仪[J].天文学报,2013,54(3):291-299.
[6]杨佳.月球伽玛能谱数据处理试验研究[D].成都:成都理工大学,2010.
[7]Zhu M H,Liu L G,Cheng Y S,et al.Iterative estimation of the background in noisy spectroscopic data[J].Nuclear Instruments and Methods in Physics Research(Section A),2009,602(2):597-599.
[2]Reedy R C.Planetary gamma-ray spectroscopy[C]//U.S.Department of Energy and NASA.Proceedings of Ninth Lunar and Planetary Science Conference.New York:Pergamon Press,1978:2961-2984.
[3]Lawrence D J,Feldman W C,Barraclough B L,et al.High resolution measurements of absolute thorium abundance on the lunar surface[J].Geophysical Research letters,1999,26:2681-2684.
[4]舒双宝,常进,蔡明生,等.月球伽玛射线谱仪的研制及其性能[J].天文学报,2006,47(2):218-223.
[5]马涛,常进,张南,等.嫦娥二号伽玛射线谱仪[J].天文学报,2013,54(3):291-299.
[6]杨佳.月球伽玛能谱数据处理试验研究[D].成都:成都理工大学,2010.
[7]Zhu M H,Liu L G,Cheng Y S,et al.Iterative estimation of the background in noisy spectroscopic data[J].Nuclear Instruments and Methods in Physics Research(Section A),2009,602(2):597-599.