Working principle of intensifying screen

English name: intensifying screen

Definition: A special diaphragm (such as rare earth compound) can absorb the energy of rays (such as X-rays, β-rays, etc.). ) and convert it into light that is more easily received by photosensitive materials, thus improving the detection sensitivity and shortening the detection time.

Function:

(1) improves the photosensitive effect of X-ray film and can greatly reduce the radiation dose to people; It provides conditions for shooting high-density and posterior tissues; Shorten the exposure time and reduce the motion blur of active organs; Prolong the service life of the light bulb; The application range of small-capacity X-ray machine is expanded.

② The contrast of X-ray film image is increased, especially when low tube voltage is used.

③ The sharpness of X-ray film image decreases, which is caused by fluorescence diffusion effect, X-ray tilt effect, poor screen adhesion and screen spots (noise).

According to the use, the sensitizing screen can be divided into medical, dental and industrial uses. Lead foil and stainless steel are mainly used in industry for industrial nondestructive testing.

Medical intensifying screen is an indispensable and important equipment for clinical X-ray photography. When used in combination with X-ray film, X-rays penetrating human body can be converted into visible light to make the film sensitive, thus improving the utilization efficiency of X-rays to make the film sensitive. It has been determined that more than 95% of the optical density images formed on the X-ray film are caused by the fluorescent substances on the intensifying screen converting X-ray energy into visible fluorescent energy and then exposing the film, while less than 5% of the optical density images are formed by the direct exposure of X-rays. Therefore, the use of intensifying screen not only greatly reduces the radiation damage of X-rays, but also further expands the inspection means and application scope of X-ray photography.