基于CE2-GRS数据的月表氢元素分布特征研究  

Distribution characteristics of hydrogen elements on lunar surface based on CE2-GRS data

作　　者：李泳珲 赵剑锟 姜爽 王飞亮 吴和喜[1,2] 刘义保 LI Yonghui;ZHAO Jiankun;JIANG Shuang;WANG Feiliang;WU Hexi;LIU Yibao(Jiangxi Research Center of Nuclear Geo-Data Science and System Engineering Technology,East China University of Technology,Nanchang 330013,China;College of Nuclear Science and Engineering,East China University of Technology,Nanchang 330013,China)

机构地区：[1]东华理工大学江西省核地学数据科学与系统工程技术研究中心,南昌330013 [2]东华理工大学核科学与工程学院,南昌330013

出　　处：《核技术》2023年第12期10-17,共8页Nuclear Techniques

基　　金：国家自然科学基金(No.12105043,No.12265003);江西省核地学数据科学与系统工程技术研究中心开放基金(No.JETRCNGDSS202105)。

摘　　要：为解决嫦娥二号γ射线谱仪(Chang’E-2 gamma-ray spectrometer,CE2-GRS)数据中氢(H)特征γ射线(^(2)H@2.223 MeV)微弱信息提取困难的问题,提出了衰变分支比剥谱与非线性最小二乘拟合高斯函数结合的方法,并基于全月幅铝(Al)丰度的研究结果,构建了剥离Al-H合峰中Al计数的特征函数,实现了对2.1~2.5 MeV能窗内干扰核素(^(214)Bi@2.204 MeV、^(27)Al@2.210 MeV、^(49)Ca@2.371 MeV)的特征γ射线的剥离,最终获取了全月幅氢元素特征γ射线的3 s计数空间分布。对全月14个典型月海地区内氢元素特征γ射线计数进行分析,结果表明:月球背面的艾肯盆地、智海与月球正面的雨海、风暴洋表现出高值特征,其计数达到平均值的2.6倍。将月表氢元素分布特征与月球勘探者(Lunar Prospector,LP)超热中子数据对比发现:二者在月球正面的雨海、风暴洋地区以及月球背面艾肯盆地的分布特征呈高度负相关。月表氢元素分布特征进一步预测了智海、雨海、风暴洋区域可能大量存在结构水,实现了对轨道γ能谱数据的深入挖掘和科学应用。[Background]Water is the primary resource required for the exploitation of lunar resources.Investigating the distribution of water on the surface of the moon has become a focal point in the lunar exploration plans of several nations.[Purpose]This study aims to quantify the presence of hydrogen and analyze its spatial distribution on the lunar surface using data from the Chang'E-2 gamma-ray spectrometer(CE2-GRS).[Methods]Firstly,an analytical method combining branch specific stripping with the nonlinear least-square fitting Gaussian function was proposed to subtract the characteristic γ rays of interfering nuclides(^(214)Bi@2.204 MeV,^(27)Al@2.210 MeV,^(49)Ca@2.371 MeV)ranging from 2.1 MeV to 2.5 MeV.Then,a characteristic function between the abundance and counts of aluminum γ rays around the moon was established to subtract the counts of aluminum in the mixed peak.Finally,the spatial distribution of hydrogenγrays for counts per 3 s on the whole lunar surface was obtained.[Results]The analysis results show that high-value characteristics exhibited in some areas,including the Aiken basin,Mare Ingenii,Mare Imbrium,and Oceanus Procellarum,are approximately 2.6 times the average value of hydrogen counts among the 14 major maria.Comparison between the distribution characteristics of hydrogen elements on the lunar surface and the data of epithermal neutrons from Lunar Prospector(LP)reveals a highly negative correlation between the distribution characteristics of the two in these regions.[Conclusions]The distribution characteristics of hydrogen elements on the lunar surface further predict that there may be a large amount of structural water in the Mare Ingenii,Mare Imbrium,and Oceanus Procellarum,formed by the combination of hydroxyl groups or molecular hydrogen(H_(2)),achieving a better understanding of the orbitγdeep mining and scientific application of energy spectrum data.

关 键 词：CE2-GRS 衰变分支比 非线性最小二乘拟合 氢元素分布 

分 类 号：TL99[核科学技术—核技术及应用]