Practical podiatry : . ntity of gas present, there will be a reduction in thespeed of the ray, due to collision and impact with the penetration of the Roentgen rays depends thereforedirectly upon the potential produced by the apparatus andinversely on the gas pressure (or directly on the vacuum)of the tube. For the purpose of controlling the state of vacuum inthe tube, a regulating system has been improvised which,when an electric current is passed through it, liberates acertain amount of gas which passes into the tube is a convenient device for reducing the vacuum of thetu
Practical podiatry : . ntity of gas present, there will be a reduction in thespeed of the ray, due to collision and impact with the penetration of the Roentgen rays depends thereforedirectly upon the potential produced by the apparatus andinversely on the gas pressure (or directly on the vacuum)of the tube. For the purpose of controlling the state of vacuum inthe tube, a regulating system has been improvised which,when an electric current is passed through it, liberates acertain amount of gas which passes into the tube is a convenient device for reducing the vacuum of thetube. Up to the present time, no one has succeeded ininventing an efficient method or device for removing gasfrom the tube, or a means which would help to increase thevacuum. It is for that reason that operators should guardagainst reducing the tube unduly. It is a simple matter toreduce the vacuum but difficult to increase it. When a tubebecomes low (when the gas content is high), resting the tube X-RAYS IN PODIATRY 393. TUBE STAND 394 PODIATRY by allowing it to remain in its bracket for a period of time,will usually suffice to increase the vacuum. The proper care of the tube is essential for good radio-grams. It should be kept free from dust, and before beingused the degree of vacuum should be determined by thetesting apparatus on the generator. If the tube is dusty ordirty, the passage of the rays through the glass will behampered, as these particles tend to deflect the rays fromtheir straight course. If the vacuum of the tube is too high,it will affect the quality of the plate, and if it is too low therewill be no penetration and therefore a blank plate. The Tube Stand. The tubes used in Roentgenology aredelicate structures and great care must be exercised so asto prevent breakage. To guard against such damage it is nec-essary to securely hold the tube in a proper device while itis being used. The tube stand should be so arranged that it ispossible to raise or lower the tube,
Size: 1287px × 1942px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, bookdecade1910, bookidpracticalpodiatr00jose
