MULTICOMPONENT SUBSTANCE ANALYSIS METHOD

摘要

The invention relates to methods for nuclear-physical analysis of complex substances and may be used to control the effective atomic number of multicomponent substances and to determine heavy element concentrations in rocks and ores. The purpose of the invention is to increase sensitivity of the effective atomic number measurement for a multicomponent substance. The multicomponent substance analysis method based on gamma-ray irradiation of the substance and measurement of the scattered gamma radiation and the critical energy corresponding to the maximum in the scattered gamma radiation spectrum, characterized in that, on the substance standards with an average effective atomic number , with successively changed probe lengths L, scattered gamma radiation energy spectra are measured and energy gaps E are found, at which the maximum scattered gamma radiation intensity contrast is observed during a single measurement , by which the relationship between the contrast to and probe length L and energy gap E is determined, probe lengths L_i and energy gaps E_i are selected at which maximum contrast to is achieved, and the effective atomic number of a multicomponent substance is determined by the scattered gamma radiation intensity at the selected probe lengths L_i and energy gaps E_i together with the critical energy. The technical result of the invention is the expansion of the method application range due to measurement of scattered gamma radiation energy spectra during successive probe length changes, determination of contrast to dependence on probe length L and energy gap E, and selection of optimal probe length L_i and energy gap E_i at which the maximum contrast to is achieved, and determination of the effective atomic number of a multicomponent substance by the scattered gamma radiation energy intensity at the selected L_i and E_i together with the critical energy.