Study On Properties Of Confocal X-ray Fluorescence Spectrometer By Experiment And Theoretical Simulation And Layer Structure Analysis Of Antiques

The concern about element distribution information of micro material and micro zone of sample is getting more deeply nowadays. And the micro X-ray fluorescence analysis which is a scatheless method for samples has a great development. In recent years, people developed a kind of new 3D confocal X-ray fluorescence spectrometer and studied the application of the new spectrometer.In this paper, we introduced the new 3D confocal X-ray fluorescence spectrometer in Institute of Low Energy Nuclear Physics, Beijing Normal University, which consists of a monolithic polycapillary lens in the excitation channel and a half-lens in the detection channel, placed in front of a micro-focus X-ray tube and of a Si detector respectively. We investigated the confocal X-ray fluorescence spectrometer's performance- the FWHM of three-dimensional confocal volume, the relationship between the FWHM and X-ray energy, the depth resolution and the minimum detect limit. Moreover, using ancient ceramics samples, we measured the layered structure with scatheless method and analyzed the merits and demerits of the scatheless method.At the same time, a new confocal X-ray fluorescence facility with synchrotron radiation source based on polycapillary x-ray optics in the detection channel and Kirkpatrick–Baez (KB) mirrors in the excitation channel is designed. With this confocal facility, we measured the several kinds of samples.In this paper, a simulation model was built based on the theories calculation of X-ray fluorescence strength and the X-ray beams'distribution of X-ray lens. Using the simulation model, we made a series of simulation experiments, and the simulation results were in good agreement with the experimental results.