Abstract
Monoenergetic protons offer advantages over X-rays in the visualization of internal bodily structures. Thus, unlike X-rays and neutrons whose flux is exponentially attenuated with respect to absorber thickness, proton flux is only moderately attenuated before falling off steeply at the end of the particle range. This property may be used to advantage by placing a photographic film in the region of very steep attenuation when radiographs of very high contrast may be obtained. A further advantage is that radiography based on proton transmission is relatively insensitive to variations in chemical composition of the tissues, but in comparison is highly sensitive to density variations. The authors report a preliminary study, accomplished by use of the 160 MeV proton beam from the Harvard Cyclotron.
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