摘要
X-ray fluorescence microtomography(μXFCT)is a nondestructive analytical technique and has been widely used to nondestructively detect and quantify the elemental composition and distributions in samples. Usually, synchrotron radiation X-rays are used for μXFCT, due to its high flux density. In this paper, a laboratory-sourcebased μXFCT system was developed, in which a polycapillary lens is employed to focus the X-ray beam and improve the flux density. The maximum likelihood expectation maximization algorithm was used to reconstruct the computed tomography slices at a limited number of projections. The experimental results demonstrated that the developed system could reveal the elemental distribution inside the test sample, with an elemental sensitivity of 1000 ppm.
X-ray fluorescence microtomography （μXFCT） is a nondestructive analytical technique and has been widely used to nondestructively detect and quantify the elemental composition and distributions in samples. Usu- ally, synchrotron radiation X-rays are used for μXFCT, due to its high flux density. In this paper, a laboratory-source- based μXFCT system was developed, in which a poly- capillary lens is employed to focus the X-ray beam and improve the flux density. The maximum likelihood expectation maximization algorithm was used to recon- struct the computed tomography slices at a limited number of projections. The experimental results demonstrated that the developed system could reveal the elemental distribu- tion inside the test sample, with an elemental sensitivity of 1000 ppm.
基金
supported by National Key R&D Program of China(Nos.2017YFA0206004 and 2017YFA0403800)
the National Natural Science Foundation of China(Nos.11775297 and U1532118)
