File:Radiography, x-ray therapeutics and radium therapy (1915) (14754529591).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

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ng gradually in intensity. By mo\ang the exposed pastilles 282 RADIATION THERAPEUTICS i 3 2 45 etc., of an erythema dose along this film, the discoloration caused bycan be measured. Dr. Bordiers Chromo-radiometer.—This chromo-radiometer depends,like Sabourauds, on the discoloration of pastilles of barium platino cyanide,but the scale shows five different tints for comparison, instead of the singleone of Sabourauds instrument. Bordiers pastilles have to be attached tothe skin of the patient. The pastilles should be compared with the scale or Teinte B by the light of a match, a candle, a benzine lamp, or otherartificial light of slight actinic power. The distance between the pastillesand the glass wall of the tube should never be less than 2 cm., to preventtheir being discoloured by the heat of the tube. The pastilles are mostaccurate when used with tubes of medium penetrating power. With softtubes they tend to indicate a smaller dose, with hard tubes a larger dosethan actually given.
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Fig. 201.—Complete Kienbcick quantimeter. (Schall.) The Kienbock Quantimeter.—This method is based on the discolora-tion of bromide of silver under the influence of X-rays. Compared ^^^th thechromo-radiometer of Holzknecht or Sabouraud, it has the advantage thatit is more sensitive, gives more subdivisions, leaves a permanent record,and is cheaper. Its only disadvantage is that the results can only be readoff after a strip of sensitive paper has been developed, a process whichoccupies one minute. There is no need to resort to a dark room, as with thehelp of a small light-tight box the development can be done in daylight inthe consulting room. The apparatus consists of : 1. Strips of bromide of silver paper measuring ; inch by 2h inches,enclosed in small light-tight envelopes. The envelopes bear a label to befilled up mth the name of the patient, date, and duration of the exposure.Envelope and strip bear identical numbers. 2. A standard scale in wooden case, containing eight differ

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