Abstract
For the x-ray fluorescence analysis of solutions formed in the technological processes of the nuclear fuel cycle, a method of preliminary selection was developed for the content of heavy elements [i, 2] according to the radiation energy of the sample, by means of a cylindrical pyrographite Bragg reflector, located between the sample and an Si(Li) detector. This method allows the background created by scattered perturbing radiation to be reduced. Limits of detection %0.15 ppm were achieved for uranium and neighboring elements in solution with quasimonochromatic excitation of a transmission x-ray tube with a 25-W power; the loading of the spectrometric channel for this amounted to less than 300 sec -z.
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