. Radiography and radio-therapeutics . d, 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 about one minute. There is no need to resort to a dark room, forwith the help of a small light-tight box the development can be done inthe treatment room. The apparatus consists of : 1. Strips of bromide of silver paper measuring \ inch by 2| inches,enclosed in small light-tight envelopes. The envelopes
. Radiography and radio-therapeutics . d, 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 about one minute. There is no need to resort to a dark room, forwith the help of a small light-tight box the development can be done inthe treatment room. The apparatus consists of : 1. Strips of bromide of silver paper measuring \ inch by 2| inches,enclosed in small light-tight envelopes. The envelopes bear a label to befilled up with the name of the patient, date, and duration of the and strip bear identical numbers. 428 RADIO-THERAPEUTICS 2. A standard scale in wooden case, containing eight different tints ofthe colours which the bromide of silver will assume gradually under theprolonged influence of the X-rays. A runner with glass window slides alongthe scale, and the developed strips are inserted in this Fig. 341.—Complete Kienbock quautimeter. (Schall.) 3. A set of four test tubes of 2 inches diameter and 2 inches length, ina small metal stand. A convenient addition, when a dark room is not available, is a dark box,which enables the operator to develop the strips in the room. This boxaccommodates the stand holding the test tubes, in which development, washing, and fixing take is, however, much better todevelop the strips in a darkroom. Arrangements for Exposure.■—One or several strips of thesensitive paper are placed on thepart to be treated ; they absorbpractically no X-rays. The sideof the envelope bearing the labelmust face the patients skin. Ifthe total dose is to be adminis-tered in several sittings, thesame strip is always exposedagain, so that the sum total of Fig. 842.—Arrangement of apparatus and paper when the rays reaching the portion of using Kienbock s method ot estimating dosage. , J . skin of the patient will also
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