Abstract
An approach permitting the use of liquid scintillation counters as full spectrometers capable of identifying the radionuclide composition of complex samples according to the measured β–α radiation spectra is presented. The approach is based on simulating the instrumental spectrum of the sample with library spectra of individual radionuclides. Two methods are presented for constructing the radionuclide library – direct measurement of β–α spectra of each radionuclide and simulation of the spectra using standard mathematical functions. It is shown that the influence of internal conversion on the simulation of the spectra of α peaks by asymmetric Gaussian distributions must be taken into account. A comparative analysis is made of modern liquid scintillation counters and of examples of analysis of the spectra of control and real samples.
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