Method for identifying radionuclides in probes using a liquid scintillation sensor

The invention relates to the field of radio-ecological monitoring and may be used to measure the content of radionuclides in different components of the environment, during the processing of results of measurement in a hardware-software complex, making it possible to deal with large masses of radio-ecological information. Furthermore, the invention may be used in the accumulation, storage, renewal and transmission of radio-ecological data with subsequent mathematical processing with the use of computer display of the results on an electronic cartographic base. More concretely, the claimed method may be used to determine the activity of beta/alpha radiating radionuclides, such as H-3, C-14, Co-60, Ni-63, Sr-90, Cs-137, U-236, Pu-239, Am-241 and others, in prepared liquid samples by processing apparatus spectra with the use of a liquid scintillation counter. The invention relates to the field of radio-ecological monitoring, in particular to a method for measuring the content of radionuclides in components of the environment. The technical result is enhancement of the sensitivity of liquid scintillation analysis of radionuclides with low activity in the presence of radionuclides with high activity. Selection and preparation of a sample for measurements are carried out, the spectrum of the sample is measured and recorded, the measured spectrum Pis grouped, model spectrum M= cM, wherein cdesignates relative contributions of base spectra of radionuclides in the model spectrum, is created on the basis of a library of base spectra of radionuclides M, where i is the No. of the group, j is the index of the radionuclide, and the content of the radionuclides in the sample is determined, minimizing the deviation of the model spectrum Mfrom the measured spectrum Pin accordance with the expression where is a coefficient determining stability of the minimization process.