Why are rays harmful to human body? This is just a particle flow. Why can it do so much damage?

Radiation is harmful to human body, but it also depends on measurement. It doesn't matter if it's mild, but it won't work for a long time or in large doses.

Ray is a ray that people can't see or touch. It can penetrate human body and general objects, even metal products. At present, widely used CT diagnostic techniques (computed tomography projection) and chest radiographs belong to the category of X-ray diagnosis. When X-ray penetrates human body, it will cause slight harm to human body, cause ionization and excitation reaction of biological macromolecules and water molecules in human body, and have harmful effects. Without any protection, irradiation will cause radiation damage to human body. X-ray has the characteristics of short wavelength, strong penetration, fluorescence, photographic function and biological utility. Through fluoroscopy, photography, irradiation and other means, the internal organs of human body are diagnosed and treated. The biological effects of X-rays absorbed after being injected into human body are harmful to human body, and the degree of damage depends on the absorbed dose. Generally speaking, too small dose is not harmful to human body, while too large dose will lead to the destruction of tissues and cells and the pathological changes of blood system.