In this paper, a detailed analysis of the relationship between various criterion factors and result errors of a lot of simultaneous equations for X-ray quantitative phase analysis is carried out and the factor g for quantitative criticizing the stability of the equations is found. According to the g factor of the different equations composed by the different samples combination, one can select the normal equation to get the precise results. Practical quantitative analysis, have proved that the new method is quite explicit and applicable.
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