. Elementary and dental radiography . ing in contact with thetube must be made of an electric non-conducting material; otherwise thecurrent would pass from the tube into them, so puncturing the tube. The uses of the compression diaphragm are: To hold the patientimmovable; to compress the soft parts as when making a picture of thekichiey, for exampk^; to aid tlie operator in (Hrecting the rays tlirough npart at the i^jropcr angle and to cut out the secc^ndary rays given ott fromthe tube. A protection shield, often called a Friedlanders shield (b i?^- ^H*which is opaque to X-rays except for the
. Elementary and dental radiography . ing in contact with thetube must be made of an electric non-conducting material; otherwise thecurrent would pass from the tube into them, so puncturing the tube. The uses of the compression diaphragm are: To hold the patientimmovable; to compress the soft parts as when making a picture of thekichiey, for exampk^; to aid tlie operator in (Hrecting the rays tlirough npart at the i^jropcr angle and to cut out the secc^ndary rays given ott fromthe tube. A protection shield, often called a Friedlanders shield (b i?^- ^H*which is opaque to X-rays except for the window or opening in it. andwhich is used to cover X-ray tubes, alsc^ cuts out some, but not all. second-arv ra\s given oft from the glass of the tube. Thus if the Xrays from an 64 ELEMENTARY RADIOGRAPHY X-ray tube are directed on a part through a diaphragm, only the directrays strike the part, as in the cHagram study shown in Fig. 65. While,with the Friedlander shield, some of the secondary rays might strike thepart also. (Fig. 66.). > Fig. 65. D D D, direct ray. S S, secondary ray. 1 P, part.
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