By Prof. Dr. G. J. van der Plaats (auth.)
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2-18. Schematic representation of an X-ray tube (a), a valve tube (b) and a semiconductor rectifier (c). The anode side is on the left, the cathode side on the right. e. opposite to the direction of the electrons). The spiral represents the filament (or cathode) and the straight line facing it represents the anode. This straight line is placed obliquely for an X-ray tube (a), but vertically for a valve (b). e. opposite to the direction of the electron current), in the anode side and a straight line for the cathode (c).
Tll 90k\fc ISO 100 ~ ~~ "" IIOkt; ........ 50 ~01 ,. ~ 2 5 0~ 2 5 2 5 10 2 ·5 100 ---T(scc;l Fig. 1 mm). This nomogram has been chosen for didactic purposes; it refers to a tube that may be considered now as outdated, being of the non-rotating type. In X-ray practice the voltage is not expressed in k Verr but in k Vp. It is indeed precisely the highest values of the tension that produce the effects important for the medical application of radiation. From now on, kV without any further qualification will denote peak voltage.
This is not the case as regards the secondary radiation emitted by the insulating media inside the shield. In analogy with the above, this radiation is also known as "stem radiation", although in fact it does not originate from the anode stem. It would be better to call it "off focus radiation". 11] OIL INSULATION AND OIL COOLING 33 consequence in practice. Its presence can be detected in fluoroscopy, however, without an absorbent medium by the appearance of a faint butterfly-shaped glow at each side of any particular field defined by the shutters of the diaphragm.