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目前,常规的扫描质子探针元素分布成图方法采用的是能量窗总计数法,即TCEW法,它的一个致命弱点就是没有剔除本底计数.因为在元素能量窗内的总计数中,不但包含元素特征X射线计数,同时也包含本底计数.本底计数受样品基体影响甚大.所以,对于基体成分变化较大的复杂样品,如岩石矿石样,TCEW法得到的元素图有时会严重失真.因此,国际上一些一流核探针实验室相继开展了真实元素图方法研究.在真实元素图方法研究中,本底值的剔除是需要解决的关键问题.本文采用一个简便、稳健的逐点本底剔除算法,在中国科学院核分析开放实验室建立了能量窗净计数(NCEW)法元素成图程序系统,并在地质样品的应用中取得良好效果.
At present, the conventional scanning proton probe elemental mapping method uses the total energy window counting method, that is, the TCEW method, one of its fatal weaknesses is not excluding the background count because the total count within the elemental energy window, not only Including elemental feature X-ray counts, as well as background counts. The background counts are strongly influenced by the sample matrix, so the elemental maps obtained by the TCEW method can sometimes be severely distorted for complex samples with widely varying matrix compositions, such as rock ores Therefore, some of the first-class nuclear probe laboratories in the world have carried out the study of the real element graph method in succession.In the study of the real element graph method, the elimination of the background value is the key problem to be solved.This paper adopts a simple, The background subtraction algorithm was used to establish the NCEW element mapping program system in the Nuclear Analytical and Open Laboratory of the Chinese Academy of Sciences and achieved good results in the application of geological samples.