ht green phosphorescence on that partof the glass which lies in front of the plane of the anti-kathodesurface, while the tube behind this plane is almost free from anygreen colour. A faint bluish luminosity in the gas itself within thetube may be seen around the back of the anti-kathode if the… … Fig. 3.—Focus Tube, showing Anti-kathode, oh Target, andExtra Anode. estimated from the brightness of the fluorescent hemisphere if theroom is dark. In daylight the fluorescence is easily overpowered.Though fluorescence goes hand in hand with x-ray production, theglass may be appreciably green in…
X-rays · Radiography
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