EDXRF中特征X射线的蒙特卡罗模拟及全能峰高斯展宽技术  

Monte Carlo simulation and Gaussian broaden technique for full energy peak of characteristic X-ray in EDXRF

作　　者：李哲[1] 庹先国[2,3] 刘敏[1] 石睿[1] 吴雪梅[1] 

机构地区：[1]成都理工大学地学核技术四川省重点实验室,成都610059 [2]地质灾害防治与地质环境保护国家重点实验室,成都610059 [3]西南科技大学核废物与环境安全国防重点学科实验室,绵阳621010

出　　处：《核技术》2012年第12期911-915,共5页Nuclear Techniques

基　　金：国家杰出青年科学基金(41025015);国家自然科学基金项目(40974065);核退役与核废物处置四川省青年科技创新研究团队(2011JTD0013);成都理工大学优秀创新团队培育计划(CDUTHY0084);国家高技术研究发展计划(2012AA063501)资助

摘　　要：针对实现X荧光先进无标样分析的前期关键技术,开展基于Si(PIN)探测器的EDXRF系统蒙特卡罗模拟及全能峰高斯展宽技术研究。以攀枝花矿区典型的铁尾矿为分析目标,实验测量得到样品中各元素特征X射线的仪器谱,通过建立Si(PIN)探测装置的蒙特卡罗模拟模型,获得铁尾矿的模拟注量谱,然后用自行计算得到的高斯展宽参数对模拟注量谱进行高斯展宽。结果表明,蒙特卡罗模拟方法能较好的实现元素定性分析,并可自动校正Fe元素对Ca、Ti、V和Cr的增强效应,自行建立的高斯展宽技术可准确得到复杂矿样中元素特征X射线的峰强度。本项研究为进一步实现先进的EDXRF无标样分析提供了关键技术。Background： Non-standard analysis （NSA） technique is one of the most important development directions of energy dispersive X-ray fluorescence （EDXRF）. Purpose： This NSA technique is mainly based on Monte Carlo （MC） simulation and full energy peak broadening, which were studied preliminarily in this paper. Methods： A kind of MC model was established for Si-PIN based EDXRF setup, and the flux spectra were obtained for iron ore sample. Finally, the flux spectra were broadened by Gaussian broaden parameters calculated by a new method proposed in this paper, and the broadened spectra were compared with measured energy spectra. Results： MC method can be used to simulate EDXRF measurement, and can correct the matrix effects among elements automatically. Peak intensities can be obtained accurately by using the proposed Gaussian broaden technique. Conclusions： This study provided a key technique for EDXRF to achieve advanced NSA technology.

关 键 词：EDXRF 蒙特卡罗模拟 高斯展宽 无标样分析 

分 类 号：O657.34[理学—分析化学]