The formation of analytical and background signals in radioisotope x-ray fluorescence analysis using a Am-241 radioactive source and a Si(Li) detector

摘要

Reasons for the appearance of a background signal in the relatively soft x-ray range (2-15 keV) upon fluorescence excitation with the Am-241 radioisotope are discussed. Mathematical models are proposed for the interaction of the radiation of the radioactive source with the sample and the Si(Li) detector, capable of describing the appearance of the analytical and background signals. It was shown that processes occurring in the Si(Li) detector should be taken into account to explain and calculate the background signal in this range. The results of calculations agree well with the experimental data obtained using an Am-241 radiation source for fluorescence excitation.