Method for measuring scattering ratio of metal alloy material based on digital ray imaging technology detector response curve

Abstract

The invention discloses a method for measuring the scattering ratio of a metal alloy material based on a digital ray imaging technology detector response curve. The measuring method comprises the steps: firstly, adopting a dosimeter and a digital ray detector to obtain a response characteristic curve of a digital detector on X rays, then respectively under two conditions of wide beam and narrow beam, placing a to-be-measured metal material step test block in an X-ray transillumination field, selecting a series of different tube voltages and exposure quantities, carrying out single-wall vertical transillumination, reading gray values of all steps under the conditions of wide beam and narrow beam from obtained step test block digital images, finding out the exposure quantities corresponding to the gray values by using the digital detector response characteristic curve, and then calculating the corresponding scattering ratio of the metal alloy material under different voltages. The method has the advantages that compared with a traditional measurement method of a radiographic technology based on films, the method is simple, high in efficiency, strong in operability and good in repeatability, and can measure the ray scattering ratio for most of metal alloy materials.

Description

technical field [0001] The invention relates to digital ray imaging technology, which uses the response curve of a digital ray detector to measure the scattering ratio of metal materials under X-ray transillumination conditions, and is a material characterization method belonging to the scope of ray non-destructive testing. Background technique [0002] When X-ray transillumination is used for non-destructive testing, the radiation intensity will be attenuated due to the absorption and scattering of the material. The distribution of this intensity attenuation is reflected in the contrast difference on the radiation detector, and then an image is formed. By analyzing the image, it can be Realize the judgment and detection of the internal discontinuity of the material. In the energy range of conventional ray detection, when X-rays pass through metal materials and reach the ray detector, in addition to the transmitted rays that do not interact with matter along the incident dir...

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Problems solved by technology

However, the above studies and measurements of the scattering ratio of materials through X-ray transillumination all use industrial film as the ray detector and recording medium, which not only requires continuous consumption of a large amount of film, but also requires darkroom processing of the exposed film to obtain test results The cycle is long, and at the same time, a large amount of chemical waste liquid harmful to the environment will be produced

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