基于聚类NASVD的CE2-GRS月表放射性元素Th计数率分布  

Distribution of the Thorium Counting Rate on the Lunar Surface from CE2-GRS Based on Cluster NASVD

作　　者：李晓丽[1] 葛良全[1] 杨佳[1] 熊盛青[2] 

机构地区：[1]成都理工大学核技术与自动化工程学院,成都610059 [2]国土资源部航空地球物理与遥感地质重点实验室,北京100083

出　　处：《原子核物理评论》2015年第4期453-459,共7页Nuclear Physics Review

基　　金：国土资源部航空地球物理与遥感地质重点实验室航遥青年创新基金资助(2013YFL07);四川省教育厅科技项目(14ZB0066);中国地质调查项目(12120113019100)~~

摘　　要：月表Th元素分布特征对于分析月表岩石成因及化学特征等提供了重要依据。为了减小嫦娥二号伽玛谱(CE2-GRS)噪声对获取Th元素分布特征的影响,提出了一种基于噪声调整的奇异值分解(NASVD)去噪算法。通过伽玛谱预处理、去噪、本底扣除及净峰面积求解等步骤,获得月表放射性元素Th计数率全月分布图。通过与国内外其他方法所获得的Th元素计数率分布图对比有较高的一致性。与传统伽玛谱去噪算法比较,聚类NASVD算法能有效地去除统计涨落噪声影响,提取出嫦娥二号伽玛谱中的特征峰信息。The distribution of thorium on the lunar surface provides the important evidence for lunar evolution history. It is difficult to obtain the distribution of thorium on the lunar surface from CE2-GRS because of noise in the spectrum. The method for smoothing the spectrum is proposed which is based on cluster NASVD. The counting rate map of thorium on the lunar surface is achieved from CE2-GRS. Counting rate map of thorium gamma-rays shows a surface thorium distribution that is in general agreement with other measurement from LP-GRS and SLENE GRS which have better accuracy. It is more effectively to reduce the noise and get the weak information of characteristic peak used the method of cluster NASVD than other traditional methods for smoothing gamma-ray spectrum.

关 键 词：嫦娥二号伽玛谱线 基于噪声的奇异值调整 聚类 Th计数率分布 

分 类 号：X591[环境科学与工程—环境工程]