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一、引言 1895年伦琴(Rontgen)发现的x射线一问世,人们马上就注意到了这种射线量子能量大、穿透本领强的特点。当它通过物体时,将随物质结构的差异而产生不同程度的吸收
I. INTRODUCTION The x-rays discovered by Rontgen in 1895 were noticed immediately. People immediately noticed that this ray has the characteristics of large quantum energy and strong penetrating power. As it passes through the object, it will absorb differently depending on the material structure