The application of the new matrix method for calculating coincidence summing effects in the case of radionuclide with the more complex decay scheme-Eu-152
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In this paper we present the results of applying the new approach for calculating coincidence summing effects. The application of analytical approaches to coincidence summing effects makes it possible to predict all summation peaks that occur in the spectrum. Accordingly, based on the value of the peak area in the spectrum and knowledge of probability transitions between excited states of a nucleus, it is possible to determine the efficiency of detection and activity of radioactive sources. This method is successfully applied to the decay of the radionuclide europium Eu-152. It provides a detailed description of the method of forming the matrix corresponding to the final result - determined activities and the efficiency of detection. The importance of the new method is that it allows us to determine the efficiency of detection and activity of radioactive sources directly without calibration of the detector, which is very important in metrology of radionuclides. (C) 2016 Elsevier B.V. A...ll rights reserved.