Optimization of a polarized source for in vivo x-ray fluorescence analysis of platinum and other heavy metals.
作者： D G Lewis
DOI: 10.1088/0031-9155/39/1/012
关键词: Collimator 、 Scattering 、 Optics 、 Polarizer 、 Physics 、 Beam diameter 、 Photon energy 、 Photon 、 Monte Carlo method 、 Polarization (waves)
摘要: The Monte Carlo method was used to optimize a polarized photon source for the X-ray fluorescence analysis of platinum and other heavy metals in vivo. consisted 140 kVp, 25 mA tube with photons plane-polarized by 90 degrees scattering. use results significant reduction background when fluorescent radiation is measured along direction polarization. A computer programme written simulate production interaction order determine optimal polarizing material dimensions, together beam width geometrical arrangement source, polarizer collimators. Calculated energy distributions are compared experimental data test validity model. best configuration polarization system vivo 20 mm Cu block secondary collimator subtending 0.1 radian angle at polarizer.
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