. Practical points in the use of X-ray and high-frequency currents . e 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 thegl
. Practical points in the use of X-ray and high-frequency currents . e 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. To this is attached a long wire with a. Fig. 32.—Regulating TubesThe above illustrates a tube having a metal tube B sealed into this metal tube is heated to a cherry red it allows gas to passinto the glass bulb, thus lowering its resistance. B can be heatedwith a match or an alcohol flame, great care being taken not to applythe heat too close to the glass, otherwise it is liable to crack.
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