CN101576517B - Method for deep space X fluorescence analysis - Google Patents
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Abstract
一种深空X荧光分析方法，涉及X荧光分析技术，在没有实际标样的条件下运用模拟标样对深空行星的荧光数据进行定量分析。该方法结合蒙特卡罗方法和基本参数法：应用太阳监视器测量到的不同时期太阳辐射X射线作为激发能谱，采用geant4软件包运用蒙特卡罗方法对不同样品的荧光光谱进行模拟，采用基于基本参数法编写的程序对在轨测量荧光能谱和模拟得到的标准能谱进行迭代运算，并根据卫星轨道数据和探测器的视场设计对数据进行网格划分，得到行星的元素分布数据。本发明方法无需携带标准样品，用蒙特卡洛模拟方法，方便而准确地得到模拟的标准样品能谱。而基本参数法是一种准确的计算方法，两种方法结合，得到准确的行星元素分布信息。A deep-space X-ray fluorescence analysis method, involving X-ray fluorescence analysis technology, uses simulated standard samples to quantitatively analyze the fluorescence data of deep-space planets under the condition that there is no actual standard sample. This method combines the Monte Carlo method and the basic parameter method: the solar radiation X-rays measured by the sun monitor in different periods are used as the excitation energy spectrum, and the geant4 software package is used to simulate the fluorescence spectra of different samples using the Monte Carlo method. The program written by the basic parameter method iteratively calculates the on-orbit measurement fluorescence energy spectrum and the simulated standard energy spectrum, and divides the data into grids according to the satellite orbit data and the detector's field of view design to obtain the planet's element distribution data. The method of the invention does not need to carry a standard sample, and the simulated energy spectrum of the standard sample can be obtained conveniently and accurately by means of a Monte Carlo simulation method. The basic parameter method is an accurate calculation method, and the two methods are combined to obtain accurate planetary element distribution information.
Description
技术领域technical field
本发明涉及X荧光分析技术领域，是一种深空X荧光分析方法，该方法实现了对深空无大气行星的成分分布测量。The invention relates to the technical field of X-ray fluorescence analysis, and relates to a deep-space X-ray fluorescence analysis method, which realizes the component distribution measurement of planets without atmosphere in deep space.
背景技术Background technique
目前，X荧光分析方法主要应用于地面元素的定量分析。其分析过程主要采用基本参数法，需要采用标准样品和未知样品进行能谱比较。国外多次任务也采用了X荧光分析方法，采用的方法为对元素峰强度比进行线性拟合。我国的CE-1卫星搭载了X荧光谱仪，拟对月球元素成分进行分析，但该次任务没有携带标样，因此无法直接应用基本参数法，而峰强度比拟合的方法给出的结果误差很大。At present, the X-ray fluorescence analysis method is mainly used in the quantitative analysis of ground elements. The analysis process mainly adopts the basic parameter method, which needs to use standard samples and unknown samples for energy spectrum comparison. Many foreign missions have also adopted the X-ray fluorescence analysis method, and the method used is linear fitting of the element peak intensity ratio. my country's CE-1 satellite is equipped with an X-ray fluorescence spectrometer, and intends to analyze the elemental composition of the moon, but this mission does not carry a standard sample, so the basic parameter method cannot be directly applied, and the result error given by the peak intensity comparison fitting method very big.
发明内容Contents of the invention
本发明的目的是公开一种深空X荧光分析方法，应用蒙特卡洛模拟方法和基本参数法对深空行星进行元素成分分析，并对数据进行网格划分，得到行星的元素分布数据。The purpose of the present invention is to disclose a deep space X-ray fluorescence analysis method, which uses the Monte Carlo simulation method and the basic parameter method to analyze the element composition of deep space planets, and divides the data into grids to obtain the element distribution data of the planets.
为达到上述目的，本发明的技术解决方案是：For achieving the above object, technical solution of the present invention is:
一种深空X荧光分析方法，可在没有实际标样的条件下对深空行星的荧光数据进行定量分析；其针对太阳监视器在不同时期测量到的太阳X射线辐射能谱，运用卫星发射前角度定标数据进行角度校正，校正后的能谱作为荧光的激发谱，运用Geant4软件包对已知成分的样品进行蒙特卡洛荧光模拟，采用基于基本参数法编写的程序将模拟得到的荧光能谱作为标准样品谱，与X射线谱仪测量得到行星表面的荧光能谱进行迭代运算，得到行星表面的元素定量结果，再根据卫星轨道数据和探测器的视场设计对测量的荧光数据进行网格划分，得到行星元素成分的空间分布信息。A deep-space X-ray fluorescence analysis method, which can quantitatively analyze the fluorescence data of deep-space planets without actual standard samples; it uses satellite-launched Angle correction was carried out on the previous angle calibration data, and the corrected energy spectrum was used as the excitation spectrum of fluorescence. The Geant4 software package was used to perform Monte Carlo fluorescence simulation on samples with known components, and the simulated fluorescence The energy spectrum is used as a standard sample spectrum, and iteratively calculated with the fluorescence energy spectrum on the surface of the planet measured by the X-ray spectrometer to obtain the quantitative results of the elements on the planet's surface, and then the measured fluorescence data is analyzed according to the satellite orbit data and the field of view design of the detector. Mesh division to obtain the spatial distribution information of planetary element components.
所述的分析方法，其所述进行角度校正，是以一个太阳监视器监视激发能谱——太阳X射线辐射能谱，并根据发射前探测器角度定标数据对测量的太阳X射线辐射能谱进行角度修正，克服角度引起的测量误差，得到真实的太阳X射线辐射能谱，以便进行准确的模拟和定量分析。Described analysis method, its described carrying out angle correction, is to monitor excitation energy spectrum---solar X-ray radiation energy spectrum with a solar monitor, and measure the solar X-ray radiation energy according to the detector angle calibration data before launch The spectrum is angle-corrected to overcome the measurement error caused by the angle, and the real solar X-ray radiation energy spectrum is obtained for accurate simulation and quantitative analysis.
本发明的有益效果是，无需携带标准样品，运用了蒙特卡洛模拟方法，可以方便而准确地得到模拟的标准样品能谱。而基本参数以往的应用表明它是一种准确的计算方法。两种方法结合，可以得到很准确的行星元素分布的信息。The beneficial effect of the present invention is that the simulated energy spectrum of the standard sample can be obtained conveniently and accurately by using the Monte Carlo simulation method without carrying the standard sample. However, the previous application of basic parameters shows that it is an accurate calculation method. The combination of the two methods can obtain very accurate information on the distribution of planetary elements.
具体实施方式Detailed ways
本发明是一种深空X荧光分析方法，运用太阳监视器测量在不同时期的太阳辐射X射线能谱——即激发能谱，通过可自由获取的geant4软件包模拟不同的成分的月岩样品在测量的激发能谱的荧光能谱，模拟得到的荧光能谱可以作为标准能谱方便地应用于进一步的分析中。The present invention is a deep-space X-ray fluorescence analysis method, using a solar monitor to measure the solar radiation X-ray energy spectrum in different periods—that is, the excitation energy spectrum, and simulating lunar rock samples with different compositions through the freely available geant4 software package After the measured excitation energy spectrum and the fluorescence energy spectrum, the simulated fluorescence energy spectrum can be conveniently used as a standard energy spectrum for further analysis.
以一个太阳监视器监视激发能谱——太阳X射线辐射能谱，并根据发射前探测器角度定标数据对测量的太阳X射线辐射能谱进行角度修正，克服角度引起的测量误差，得到真实的太阳X射线辐射能谱，以便进行准确的模拟和定量分析。Use a solar monitor to monitor the excitation energy spectrum—the solar X-ray radiation energy spectrum, and correct the measured solar X-ray radiation energy spectrum according to the angle calibration data of the detector before launch, so as to overcome the measurement error caused by the angle and obtain the true Solar X-ray radiation energy spectrum for accurate simulation and quantitative analysis.
本发明应用了本案申请人编写的基于吉昂等著的《X射线荧光光谱分析》一书P.118中介绍的一种理论方法——基本参数法程序，将模拟得到的月岩荧光能谱作为标准能谱和X谱仪测量的行星表面能谱进行迭代运算，从而得到元素丰度数据。再根据卫星绕月的轨道和发射前角度定标得到的探测器视场的角度响应，采用空间网格划分方法，得到月球元素成分的空间分布数据信息。The present invention applies a theoretical method introduced in the book P.118 of "X-ray Fluorescence Spectral Analysis" written by the applicant of this case based on the book P.118 of Gion et al.—the basic parameter method program, and the simulated lunar rock fluorescence energy spectrum As a standard energy spectrum and the planetary surface energy spectrum measured by the X-ray spectrometer, iterative calculation is performed to obtain the element abundance data. Then, according to the orbit of the satellite around the moon and the angular response of the detector's field of view obtained by the angle calibration before launch, the spatial grid division method is used to obtain the spatial distribution data information of the lunar element composition.
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| CN101038261A (en) * | 2006-03-17 | 2007-09-19 | 中国辐射防护研究院 | Method for calibrating passive efficiency of high-purity germanium detector |
| CN101038169A (en) * | 2007-02-13 | 2007-09-19 | 北京空间飞行器总体设计部 | Navigation satellite autonomous navigation system and method based on X-ray pulsar |
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| CN101038261A (en) * | 2006-03-17 | 2007-09-19 | 中国辐射防护研究院 | Method for calibrating passive efficiency of high-purity germanium detector |
| CN101038169A (en) * | 2007-02-13 | 2007-09-19 | 北京空间飞行器总体设计部 | Navigation satellite autonomous navigation system and method based on X-ray pulsar |
Non-Patent Citations (4)
| Title |
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| 崔兴柱等.基本参数法在X射线荧光能谱分析中的应用.《第十三届全国核电子学与核探测技术学术年会论文集（上册）》.2006,第310-314页. * |
| 张家宇等.嫦娥一号卫星X射线谱仪能量响应矩阵的计算.《核电子学与探测技术》.2007,第27卷(第4期),第651-653页. * |
| 曹雪蕾等.嫦娥一号卫星X射线谱仪的性能模拟.《核电子学与探测技术》.2007,第27卷(第5期),第813-816页. * |
| 王焕玉等.空间X射线成像谱仪系统及其软件研制.《核电子学与探测技术》.2008,第28卷(第2期),第215-218,222页. * |
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