METHOD OF MEASURING THE ISOTOPIC SAMPLE SYSTEM CHARACTERISTICS WHEN PHASED SEPARATING THE ANALYZED SUBSTANCE (VERSIONS) Russian patent published in 2018 - IPC G01N33/00 G01N23/02 

FIELD: geochemistry.

SUBSTANCE: group of inventions relates to analytical methods of isotope geochronology and geochemistry. Method includes measuring the quantity of each isotope in the test substance separated from the sample portion at each phase of test sample separation from the sample portion; introduction of standard corrections into the experimental data; calculation of ratios ΔF /Δt, where F and t is the quantity of the first and second isotope in the test substance separated from the sample portion, or another continuous parameter indicating the phase test sample separation from the sample portion, ΔF and Δt – increments F and t, corresponding to the phase of test substance separation from the sample portion; and calculation of the characteristics of the isotope system of the sample from the obtained data, the phased separation of the test substance from the sample weight for two or more weights of the same sample, setting for different sample weights different limits of the phase of test substance separation from the sample weight according by T, with the exception of several limits of the phase of test substance separation from the sample weight by T, where T is a continuous parameter, indicating the phase of test substance separation from the sample weight and changing for each sample weight within the same limits; form for each sample weight data arrays M_m, representing the F (t)_m, where index m indicates the numbers of data arrays M_m and dependences F (t)_m; set of points representing dependences F (t)_m and given by data arrays M_m, are divided into sets of points, representing the regions of dependencies F (t)_m, and sharply divergent sets of points representing the regions of dependencies F (t)_m, are moved along the coordinates F and t, preserving the distances along coordinates F and t between the points belonging to the same set of points representing the region of dependencies F (t)_m, ensuring the consistency of corresponding dependencies F (t)_m, obtained by separating the test substance from different sample weights; dependencies of F (t)_m are spread (compressed) along coordinates F and t, ensuring the coincidence of the points of corresponding dependencies F (t)_m, obtained by separating the test substance from different sample weights, corresponding to the same values of T; data arrays M_m are united, representing the corresponding dependencies F (t)_m, obtained by separating the test substance from different sample weights, in the data arrays D^*_n, representing the dependencies F (t)^*_n corresponding to these data arrays, where index n indicates the numbers of data arrays D^*_n and dependences F (t)^*_n; dependences F (t)^*_n are approximated by functions F (t)^apr_n; ratios ΔF /Δt are calculated as derivatives of the corresponding functions F (t)^apr_n. Second embodiment of this method is also provided.

EFFECT: it is possible to suppress isotope sample system characteristic distortion, and to suppress distortions caused by influence of random factors.

2 cl, 2 ex, 13 dwg