. The American journal of roentgenology, radium therapy and nuclear medicine . n which acathodically active point is mounted, facinga plane anode of the material to be sput-tered. While connected to the pump theelectrodes arc treated in the regular way,in order to set out as much as possible ofthe occluded gases. After sealing the tube, asufficient layer of sputtered stuff is pro-duced and since afterwards the electrodesare no longer to be used any more, the\ arecovered with protective caps. 21(g). I have not yet been able to deter-mine satisfactorily the electric properties—first of all the c
. The American journal of roentgenology, radium therapy and nuclear medicine . n which acathodically active point is mounted, facinga plane anode of the material to be sput-tered. While connected to the pump theelectrodes arc treated in the regular way,in order to set out as much as possible ofthe occluded gases. After sealing the tube, asufficient layer of sputtered stuff is pro-duced and since afterwards the electrodesare no longer to be used any more, the\ arecovered with protective caps. 21(g). I have not yet been able to deter-mine satisfactorily the electric properties—first of all the characteristic of the tube;a plant delivering a constant direct curren! of high voltage being needed for the purposeand only little time being available, I wasobliged to postpone a more detailed re-search of this subject, as well as of manyother rather important features. But thereis no doubt that a rapid increase of themilliamperage with a rising voltage takesplace, probably an exponential function(10). Evidently, if worked by alter-nating or pulsating direct current, the. Fig. c discharge is limited to the peaks and theadjacent parts of the waves of the voltageto a larger extent than is the case with anyother of the present tubes: surely, to a verymuch larger extent than with the regularhot cathode tubes, in which the milliam-perage is practically independent of thevoltage. Consequently, the same spark gapbeing supposed, not only is there obtaineda considerably higher average hardness ofthe radiation, not only a much largerintensity ol radiation per milliampere, butalso a much more homogeneous qualit\ ofradiation. The degree of homogeneity canbe regulated by choosing proper forms-different numbers of points, differentlengths of the edges of the cathode. A New Form of A-Rav Tube 179 22(h). While the constructive features asdescribed are essential and will probablyremain typical with the tubes constructedaccording to the principle developed above,the same cannot be said of the
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