Jämförelse mellan MultiScat och konventionell beräkning av intensiteter till koncentrationer vid analys med röntgenflourescensspektrometri
MultiScatRöntgenfluorescensRöntgenspektrometriRöntgenstrålningRöntgenfluorescensspektrometriKemiskAnalysSpektrometri
In this master thesis work, a new method called MultiScat, is compared with the conventional method with alfa-correction, for computing concentrations from intensities in X-ray spectrometric analysis. The conventional model is a linear model, which only takes the photoelectric effect into consideration. It doesn't consider Rayleigh and Compton scattering even though it has a great impact on the measured intensities. Here MultiScat differs a lot. MultiScat is based on a solution of the Boltzmann transport equation. This approach allows not only for the photoelectric effect to be taken into consideration, but also accounts for the Rayleigh and Compton scattering effects. The comparison has been made with the aid of a new method, computation of the f-factor, which is a method for comparing different models, over an arbitrary concentration interval, using only one parameter. The conclusion of this work is that the MultiScat model is a good alternative to the conventional model. The MultiScat model seems to perform better especially over bigger concentration intervals. Another positive side of the MultiScat model is that the calibration is very easy to do, in comparison to calibration of the conventional model.