[en] Method for sample preparation for nuclear physical analysis is proposed permitting to improve the sensitivity and the accuracy of analysis and to extend the nomenclature of materials analysed and element determined. For this purpose, sample separation from a nuclear or membrane filter after sampling microsuspensions or aerosols is performed by placing filter's surface with a sample on a subsrate of pure metal (In, Pb, Al) with low microhardness and high plasticity at the temperature below the temperature of filter material softening, their pressing and filter removal