. Practical points in the use of X-ray and high-frequency currents . J3L(/££/Af£ Fig. 30.—Above figure shows low resistance tube. Between the targetand the cathode you will notice a heavy blue stream. The full hem-isphere in front of the target shows green. ode stream is reflected from the target, strikingon the walls of the glass globe, and where itstrikes, another X-ray is generated. These raysare what are called wild X-rays (see Fig. 31)and are very undesirable. X-ray Tube That Can Be Regulated. Thisis of the same type as the one above described,but has in addition a small platinum tube sea
. Practical points in the use of X-ray and high-frequency currents . J3L(/££/Af£ Fig. 30.—Above figure shows low resistance tube. Between the targetand the cathode you will notice a heavy blue stream. The full hem-isphere in front of the target shows green. ode stream is reflected from the target, strikingon the walls of the glass globe, and where itstrikes, another X-ray is generated. These raysare what are called wild X-rays (see Fig. 31)and are very undesirable. X-ray Tube That Can Be Regulated. Thisis of the same type as the one above described,but has in addition a small platinum tube sealedinto it, having the end which is inside of the globe X-Ray Tubes 67 open and the other end closed and this platinum tube is heated to a brightred, it allows gas from the air to pass through theplatinum into the globe, and in this way lowersthe resistance inside of the tube. In using thisregulator, care must be taken not to bring it toa white heat, also not to apply the heat at the. Fig. 31.—Above figure shows the three sources of rays from an X-raytube. A represents the principal ray, which is generated at thetarget. BJ represents the wild X-ray, generated from the walls ofthe tube. C represents the secondary ray, which is generatedwhenever the principal or wild ray strikes an object. Rays A andB vary with the resistance of the tube. Ray C varies withthe density of the substance struck by principal ray. B rays aregenerated from the entire hemisphere of the tube in front of the target. extreme end of the tubing nor too close to theglass. Otherwise we are liable to either crackthe glass or unsolder the end. (See Figs. 32 and33 to 36, inclusive.) A very common form of tube at present isknown as the self-regulator. A short, L-shapedtube is let in at the top of the globe. This isfilled with asbestos or some chemical which 68 X-Ray and High-Frequency Currents gives off a gas when the electric current passesthrough. A wire is let in through the end of thetube.
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