The new technique is developed to measure 90Sr in samples with a high specific activity and based on using characteristic Kx-radiation. The probability of Kx-radiation during the radioactive decay with the emission of electrons of 90Sr and 90Y was measured. The method for determination of 90Sr in the fuel-containing materials was proposed from the data on the probability of ionization of atoms in β-decay. Measurements of 90Sr were executed in fuel fragments of various types. Obtained results was compared and verified with the radiochemical research of these samples. The proposed method allows to execute the measurement of 90Sr with an accuracy of 3-5% in the samples with high specific activity. These results open up new possibilities in the study of radioactive materials produced as a result of nuclear fission. Keywords: spectroscopy, strontium, autoionization, fuel-containing materials
23.40.-s β decay; double β decay; electron and muon capture
$^1$MSU, Faculty of Physics\
$^2$MSU, Faculty of Physics
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