. Radiotherapy and phototherapy : including radium and high-frequency currents, their medical and surgical applications in diagnosis and treatment ; for students and practitioners . e quantity ofradium and their radioactive properties. In placing upon a microscopic slide a small quantity ofradium, in front of a fluorescent screen under the microscope,scintillations can be observed. The screen transforms the RADIUM 535 invisible emanations into waves which the eye can perceive,the radiations emitted being longer than those absorbed bythe screen; a tube having a screen at one end and a movablepo
. Radiotherapy and phototherapy : including radium and high-frequency currents, their medical and surgical applications in diagnosis and treatment ; for students and practitioners . e quantity ofradium and their radioactive properties. In placing upon a microscopic slide a small quantity ofradium, in front of a fluorescent screen under the microscope,scintillations can be observed. The screen transforms the RADIUM 535 invisible emanations into waves which the eye can perceive,the radiations emitted being longer than those absorbed bythe screen; a tube having a screen at one end and a movablepointer carrying the radium and a powerful lens in a slidingtube make it possible to dispense with the microscope. Radium Emanations. Radiations or products of appar-ently gaseous nature are continually given off as an invisiblevapor, so to speak, capable of depositing upon surfaces andcausing acquired radioactivity in various substances. To demonstrate their existence, Prof. Curie employs asimple apparatus, as shown in Fig. i lo. The bulb R containsa solution of salts of radium. In the angular tube connectingwith the larger bulb A and the smaller B, which are filled Fig. Apparatus for demonstrating radium emanations with sulphide of zinc, is a tight stopcock; another shut off inthe tube E permits of the exhaustion of the bulbs A and a darkened room the bulbs A and B, after exhaustion,glow brilliantly when the stopcock F is opened. Since therewas no glow previously, it proves that the radiance has notpassed directly over from the radium through the glass walls,but must have gone around through the bent glass tube. It is also known that radium rays are capable of passingthrough glass, but have no power of affecting zinc now the tube B be plunged in a basin (G) containingliquid air the intensity of the glow is increased at theexpense of the brilliancy of the light within the bulb what occurs by this outside cold effect is not known, 536 RADIOACTIVITY b
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