File:Radiography, x-ray therapeutics and radium therapy (1915) (14570879218).jpg

Identifier: radiographyxrayt00knoxuoft (find matches)
Title: Radiography, x-ray therapeutics and radium therapy
Year: 1915 (1910s)
Authors: Knox, Robert, 1868-1928
Subjects: Radiography Radiotherapy X-rays
Publisher: London : A. & C. Black
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: MSN

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
o^vn the glass sleeveto the platinum vessel, and is thusbrought into actual contact ^\iththe back of the target. Thislatter feature is an essential in theconstruction of a water-cooled tube. Workers are strongly advised not topurchase so-called water-cooled tubes when the water does not reach rightdown to the back of the target, as such instruments simply omit the \italprinciple which renders the water-cooled tube so highly efficient. WTien the heat is generated by the impact on the target it is immediatelyimparted to the water, and the temperature of the target can therefore onlymomentarily exceed that of boiling water—100° C. Apart from the efficiency of the cooling system, the construction ofwater-cooled tubes renders them more satisfactory in other respects. Inthe first place it is possible to make the anti-cathode almost entirely ofplatinum, which means that there is practically no metal in the tube likelyto give rise to \iolent changes of vacuum. The water-cooled tubes remain
Text Appearing After Image:
Fig. 28. -Water-cooled tube arranged for overheadwork. (C. Andrews.) 32 EADIOGRAPHY therefore at approximately the same degree of hardness for very long periods.The great advantage in this respect cannot be over-estimated, and willappeal both to those who are doing continuous radiographic work, and tothose running tubes for long periods for therapeutic pmposes. Tlie latterpoint is of extreme importance for deep therapeutics. The employment of water as a cooling medium is free from all objection,even from that of extra trouble in manipulation ; for if tubes, when notactually running, are stored in one of the excellent vertical holders now onthe market, it is not necessary even to emptv the water bulb after use, andthe only extra attention entailed is the occasional replacing of the waterwhich may be lost by evaporation. The principal feature of water-cooled tubes is that they may be keptin continual use for hours, without any danger of over-heating and consequent ^1 .^-- ^P

Note About Images