. Practical points in the use of X-ray and high-frequency currents . -tity of current, but are not very satisfactory forradiographic work. Their life, if properly used,is equal to that of the ordinary tube, but theirvacuum readily breaks down if overheated bytoo prolonged use or the passage of too large aquantity of current. Care of the X-ray Tube. In cold weather alltubes should be brought to body temperature byhandling or a spirit lamp before being put in prevents too rapid expansion of the a tube is overheated, it should be slowlycooled before being put in the rack. Other
. Practical points in the use of X-ray and high-frequency currents . -tity of current, but are not very satisfactory forradiographic work. Their life, if properly used,is equal to that of the ordinary tube, but theirvacuum readily breaks down if overheated bytoo prolonged use or the passage of too large aquantity of current. Care of the X-ray Tube. In cold weather alltubes should be brought to body temperature byhandling or a spirit lamp before being put in prevents too rapid expansion of the a tube is overheated, it should be slowlycooled before being put in the rack. Otherwise,a puncture is liable to result. Tubes should be 84 X-Ray and High-Frequency Currents changed often, and not required to do too greatan amount of work at one session. It is wise touse all new tubes as treatment tubes, using asmall quantity of current until they are properlyqualified as radiographic tubes. No tube shouldbe required to take more than one picture at asession, where the quantity of current requiredis great in order to produce penetration. 7^ro>. Fig. 43.—Shows the best position to place the plate in relation to theX-ray tube. E represents the X-ray plate, D the part to beradiographed, A represents a cork having a thread passed downthrough the center of it B and a pointer attached to the lower endC. This pointer should come over the central portion of theX-ray plate. General Laws Governing the Use of X-rayTubes. For our purpose the principal ray froman X-ray tube is midway between the cathodeand a point opposite the anode, but it must beremembered that rays are given off with less X-Ray Tubes 85 intensity from all parts of the tube. (See ) The patient should be placed opposite theprincipal ray, which should be as carefully ad-justed as in aiming with a gun. This is a pointmore generally neglected by the beginner inradiotherapeutic work than any other point wehave noticed. (See Figs. 44 and 45.) The action of the soft X-ray produced by thecathode stre
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