Crystal rocking curve measurement method based on energy resolution detector

A rocking curve and energy resolution technology, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of complex measurement process and so on

Inactive Publication Date: 2016-08-17
NORTHWEST INST OF NUCLEAR TECH
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Problems solved by technology

This method also has high measurement accuracy, but the measurement process is complicated, especially the measurement energy point is heavily dependent on the chara

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  • Crystal rocking curve measurement method based on energy resolution detector
  • Crystal rocking curve measurement method based on energy resolution detector
  • Crystal rocking curve measurement method based on energy resolution detector

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Embodiment Construction

[0040] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] Diffraction occurs when X-rays are irradiated on the crystal, and the relationship between diffraction energy, diffraction angle and diffraction crystal plane can be described by Bragg formula

[0042] 2d sinθ B =nλ

[0043] Where d is the interplanar spacing, λ is the X-ray wavelength (the conversion relationship between X-ray wavelength and energy can be simply expressed as E=12.398 / λ), θ B is the Bragg diffraction angle. For a certain energy, except for the Bragg diffraction angle θ that strictly satisfies the Bragg formula B In addition, diffraction will also occur in a small angle near it, but the diffraction intensity is relatively small, and with the deviation from the Bragg diffraction angle θ B rapidly decreases to zero. The crystal rocking curve is the description of the relationship between the diffraction intensity of ...

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Abstract

The invention relates to a crystal rocking curve measurement method based on an energy resolution detector, comprising the steps of 1, selecting an X-ray tube anode target material and voltage/current parameters based on an X-ray energy range {E} for measurement; 2, determining a Bragg diffraction angle range {theta B}, a crystal rotation angle range {theta T} and a rotation stepping angle; 3, measuring a crystal diffraction energy spectrum of each rotation angle within the {theta T}; 4, correcting the effect of scattering factors in the crystal diffraction energy spectrums; 5, extracting the diffraction strength of X-ray of energy Ej in {E} within a unit interval when theta Ti = theta Bi, so as to obtain a strength variation curve of Ej; 6, performing diffraction peak fitting on the strength variation curve; 7, figuring out a first-order derivative of a fitted diffraction peak, selecting absolute values of a part of the diffraction peak where the slope of the first-order derivative is not less than 0, i.e., the left and right branches of a rocking curve, and splicing to obtain the rocking curve of Ej; 8, repeating steps 5-7 until {E} is traversed, thereby obtaining the rocking curve of the X ray of all energies in {E} to a certain lattice plane of a crystal.

Description

technical field [0001] The invention relates to a method for measuring rocking curves of crystals. The method utilizes an energy resolution detector to realize the measurement of rocking curves of crystals with multiple energies under single scanning conditions, especially non-characteristic X-ray energy. Background technique [0002] In the field of pulsed X-ray energy spectrum measurement, crystal spectroscopy is a very important measurement method. Using the diffraction of X-rays by crystals, the X-ray energy distribution is converted into the spatial distribution of diffraction intensity, and then according to the integral diffraction coefficient of different energies Reverse the original energy spectrum. The integral diffraction coefficient is obtained by integrating the rocking curve of the X-ray diffraction plane of the crystal. When a certain energy X-ray enters the crystal, there will be diffraction of the energy X-ray in a small angle area near the Bragg diffracti...

Claims

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Application Information

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IPC IPC(8): G01N23/207
CPCG01N23/207
Inventor 马戈黑东炜唐波魏福利罗剑辉周海生夏惊涛李斌康盛亮
Owner NORTHWEST INST OF NUCLEAR TECH
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