Applications of the laser spectroscopy methods for ultrasensitive trace analysis of the different samples containing both stable and radioactive isotopes were analyzed. Different methods for isotope ratios measurements and for valence states and type of molecules determination are considered. Special attention is given to the trace analysis of Pu, U and other actinides. Ultrasensitive methods of analysis based on combination of laser spectroscopy methods with nuclear-spectroscopy and mass-spectroscopy methods may be applied in many fields including both fundamental and applied research and Hi-Tech.

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