. Radiography and radio-therapeutics . trips 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 apparat
. Radiography and radio-therapeutics . trips 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 reachthe strip. If many sittings with short exposures are to be given, it is con-venient to use more than one strip; one is left to record the total sum,and of the other, parts are cut off from time to time to make test de-velopments. The number of the strip (and other data) should be immediately. B 1000 Distilled water 1C00 150 grammes Potassium carbonate . 110 grammes 15 K1ENBOCK QUANTIMETER 429 entered into the case book or chart, where also the strip is attached whenit has been washed and dried. This provides a permanent record of thedose given. Development.—In order to find out the quantity of X-rays which hasbeen administered, the strip has to be developed. The developer consists of two stock solutions, A and B, mixed in properproportions with distilled water, and made up as follows : Distilled waterSulphite of sodaMetol (Hauff) . Owing to the difficulty, at the present time, of obtaining metol, substituteshave to be used. When the developer is changed it is necessary to ascertain the time factorfor each set of strips; this should be done experimentally. FIXING SOLUTION Distilled water .... 1000 Sulphite of soda ... 20 grammes Tartaric acid . . 10 ,, Hyposulphite of soda . . 200 ,, Great care must be taken in preparing
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