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1. Penetration is the ability of X-rays to pass through matter without absorption. X-ray can penetrate substances that can not be penetrated by ordinary visible light. Visible light has a long wavelength and some of its energy is very small. When it strikes an object, a part of it is reflected, and most of it is absorbed by matter and cannot pass through the object. But X-ray is not. Because of its short wavelength and high energy, only a part of it is absorbed by matter, and most of it is transmitted yuniguhua.71ix.comshijiazhuang.75ix.cnyesanpo.37ix.com.cnbaoding.75ix.cnmojusn.37ix.com.cnbx
gxianwei.37ix.com.cnthrough the atomic gap, showing a strong penetration ability. The ability of X-ray to penetrate matter is related to the energy of X-ray photons. The shorter the wavelength of X-ray, the greater the energy of photons and the stronger the penetration force. X-ray penetration force is also related to the density of matter. Dense matter absorbs more X-ray and transmits less. Dense matter absorbs less and transmits more. Differential absorption can be used to distinguish soft tissues such as bones, muscles and fats with different densities. This is the physical basis of X-ray fluoroscopy and photography.