Do you usually check the DR of your body? Does its membrane have radiation?

The photo itself has no radiation. The radiation comes from the X-ray machine that shoots the film. The radiation produced by the X-ray machine passes through the measured object and hits the film. Silver bromide on the film changes chemically, and an image is produced after development and fixation.

The harm of radiation to the body mainly depends on the intensity and penetration range of radiation (such as circumferential radiation, directional radiation, scattered radiation, etc.). If it is a high-power X-ray machine, it can cause harm to the body in a few minutes, mainly to human cells, such as killing platelets and white blood cells. X-ray industry belongs to a special industry, and general units should be equipped with X-ray dose alarming devices, as well as protective facilities such as lead vests and lead shorts. There is no absolute safe distance, it depends on the radiation intensity. But it should be safe if there is a lead door or lead room with a certain thickness for isolation. The flaw detection room must be evaluated by the environmental protection department during construction.