X-ray Fluorescence Analysis Internal Standard Method
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Solution Overview
Problem
Existing X-ray fluorescence analysis methods fail to accurately determine the concentration of elements with atomic numbers ranging from 9 to 20 in liquid samples containing hydrogen, carbon, oxygen, and nitrogen, due to non-measurable elements affecting the internal standard line's accuracy.
Innovation Solution
The method employs scattered X-rays caused by continuous X-rays as an internal standard line, with a wavelength shorter than the fluorescent X-rays emitted from the elements, ensuring the measured intensity of scattered X-rays is inversely proportional to the mass absorption coefficient, allowing accurate calculation of element concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Compton scattering X-rays of characteristic X-rays of primary X-rays are used as internal standard lines, then the method can minimize inter-element effect on absorption of fluorescent X-rays, but the internal standard line fails to reflect the composition of the sample accurately when determining sulfur concentration in liquid samples containing hydrogen, carbon, oxygen, and nitrogen
Solution Approach 1:
The invention changes the parameter of the internal standard line from Compton scattering X-rays to scattered X-rays caused by continuous X-rays, with specifically controlled wavelength shorter than the fluorescent X-rays. This parameter change enables the internal standard line to accurately reflect sample composition even in the presence of non-measurable elements like hydrogen, carbon, oxygen, and nitrogen, thereby resolving the contradiction between reliability and measurement precision.
2Measurement precision
If scattered X-rays caused by continuous X-rays are used as internal standard line with wavelength shorter than fluorescent X-rays, then the internal standard line accurately reflects sample composition, but requires precise control of wavelength and inverse proportionality between intensity and mass absorption coefficient
Solution Approach 1:
The invention replaces complex mechanical wavelength control mechanisms with a method based on physical principles. By selecting scattered X-rays from continuous X-rays with wavelengths shorter than fluorescent X-rays, the system naturally satisfies the inverse proportionality condition between intensity and mass absorption coefficient. This substitution reduces device complexity while maintaining high measurement precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach accurately reflects the composition of liquid samples, enabling precise concentration calculation of elements with atomic numbers 9 to 20, even in the presence of non-measurable elements like hydrogen, carbon, and nitrogen.
Implementation Method 1
intensity of fluorescent X-rays, emitted from the element to be analyzed
Implementation Method 2
intensity of Compton scattering X-rays of characteristic X-rays of primary X-rays
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
An X-ray fluorescence analyzing method includes irradiating a liquid sample (3A) containing hydrogen and at least one element of carbon, oxygen and nitrogen with primary X-rays (2); measuring the intensity F of fluorescent X-rays (4) from each of elements in the sample (3A) and having the atomic number 9 to 20, and the intensity S of scattered X-rays (12) from the sample (3A) caused by continuous X-rays in the primary X-rays; and calculating the concentration of each of the elements, based on the ratio between the measured intensity F, and the measured intensity S. The wavelength of the scattered X-rays (12) is so chosen as to be shorter than that of the fluorescent X-rays (4) and is so set that the measured intensity S and the mass absorption coefficient thereof are inversely proportional to each other within the range of variation of a composition of the sample (3A).