. The principles and practice of roentgenological technique . rfacesof the hemisphere of the bulb. The mostintense radiations are about the central bundleand at an angle of thirty degrees to the cathodestream at the point of impact upon the target. An x-ray tube correctly activated and freefrom inverse is separated b_v the anti-cathode, into two sharply defined hemispheres,the active half, in front of this target, fluor-escing a light green, while the inactive onebehind is relatively dark. In a correctly ener-gized tube the zones are sharply bordered. A tube with low vacuum is called soft,one
. The principles and practice of roentgenological technique . rfacesof the hemisphere of the bulb. The mostintense radiations are about the central bundleand at an angle of thirty degrees to the cathodestream at the point of impact upon the target. An x-ray tube correctly activated and freefrom inverse is separated b_v the anti-cathode, into two sharply defined hemispheres,the active half, in front of this target, fluor-escing a light green, while the inactive onebehind is relatively dark. In a correctly ener-gized tube the zones are sharply bordered. A tube with low vacuum is called soft,one with high vacuum hard. A hard tubeofters a higher resistance to the passage ofthe current and requires a higher potential to THE PRODUCTION OF X-RAYS 81 energize it and produces rays of higher pene-trating power which are called hard rays. Asoft tube produces rays of low penetratingpower, called soft rays. The hardness of thex-rays is entirely dependent on the maximum]iotential difference between the electrodes ofthe bulb, in other words, the impressed vol-. Fic. 97.—The vacuum is so low that the cathodestream is not focused. tage. This potential difference may be con-trolled in several ways. 1. By varying the characteristics of thetube:A. \acuum. The higher the vacuum, the higher the vol-tage necessary to generate x-rays and thehigher the resulting rav.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920
