In the region of radiological medicine, intensity of primary radiation delivered from X-ray tube has always become a subject of discussing, but after the introduction of high voltage radiography, it came to be known that tube voltage, especially intensity of primary radiation, was connected with the radiographical effects, and that the absorption quantity of the bones were greatly influenced by the wave-length of X-ray, but one of the soft tissues was comparatively invariable, in addition, I will conclude from my experimental results that intensity of primary radiation incleases in passing througe the human body and a film is exposed by X-ray with changed quality after passing.
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