X-ray flaw detection is a flaw detection method that uses rays to penetrate objects to find internal defects.
Radiation can make films sensitive or excite some materials to emit fluorescence. The ray attenuates according to a certain law in the process of penetrating the object, and the internal defects of the object can be detected by using the relationship between the attenuation degree and the sensitivity of the ray or the excited fluorescence.
X-ray flaw detection is divided into X-ray flaw detection, gamma-ray flaw detection, high-energy ray flaw detection and neutron ray flaw detection.
Radiation is harmful to human body. In the process of flaw detection, relevant safety operation procedures should be observed and necessary protective measures should be taken.
The working voltage of X-ray flaw detection equipment is as high as tens of thousands of volts or even hundreds of thousands of volts, so attention should be paid to the danger of high voltage when working.
X-ray flaw detection (X, γ) method (RT)
One of the nondestructive testing methods commonly used in industry. Refers to the use of electromagnetic waves to detect metal workpieces, similar to X-ray perspective. When the ray passes through the material and reaches the negative film, it will make the negative film evenly sensitive; If cracks, holes, bubbles and slag inclusion are encountered, shadow areas will be displayed on the negative. This method can not only detect the size and shape of defects, but also determine the thickness of materials.
X-ray is excited by X-ray tube and high-voltage electricity, and the intensity of X-ray can be adjusted by applying voltage and current.
Gamma rays are excited by radioactive elements, and their intensity is not adjustable, but they decrease exponentially with time.
X-ray flaw detection uses radioactive sources to emit radiation, which is extremely harmful to people. Careless operation will lead to radiation and increase the probability of leukemia. Operators should wear protective clothing and pay attention to the correct storage of radioactive sources.