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一、射线检测原理射线——我们指的是波长比紫外光还短的电磁波,X光及γ光。X光波段的波长范围为10~(-8)～10~(-13)m,γ波段的波长范围为2×10~(-9)～2×10~(-13)m。它们能穿透物体从而获得物体内部的信息。射线穿透物体时,一部分光子或光子能量被物体吸收,产生散射的光子或二次电子,使穿透过去的光子数量及能量发生变化。令入射线的强度为I_0,贯穿后的出射线强度为I,则得 I=I_0e~(μd) (1)式中d为物体的厚度,μ称为材料对射线的吸收系数。如果物体的组织不均匀,或者内部有孔洞或夹杂,则物体各部分的吸收系数并不相同,因此检测到的各
First, the principle of radiation detection Rays - We mean electromagnetic waves shorter wavelength than ultraviolet light, X-ray and gamma light. The wavelength range of the X-ray band is from 10 -8 to 10 13 and the wavelength range of the γ-band is from 2 × 10 -9 to 2 × 10 13. They can penetrate the object to get the inside of the object. When a ray penetrates an object, a portion of the photon or photon energy is absorbed by the object, resulting in scattered photons or secondary electrons that change the amount and energy of photons that have passed through it. Let the intensity of the incident line is I_0, the intensity of the outgoing ray passing through is I, then I = I_0e ~ (μd) (1) where d is the thickness of the object and μ is the absorption coefficient of the material to the ray. If the object’s tissue is not uniform, or internal holes or inclusions, the absorption coefficient of the various parts of the object is not the same, so each detected