File:Radiography, x-ray therapeutics and radium therapy (1915) (14754533051).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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g to dampness cannot take place. AVhen the X-rays reach thisionising chamber the electrometer begins to discharge, and the index of theneedle moves from 0 towards 10. The division of the scale has been calibrated to agree with the Kienbockquantimeter. When the needle reaches 10, the ionising chamber, whichcan be exposed on the skin of the patient, has received a full erythemadose. The instrument is so sensitive that half an x, i.e. the twentieth partof an erythema dose, can be measured. The degree of ionisation varies withthe penetrating power, and the instrument can be calibrated for variousdegrees of it by placing diaphragms of lead over the ionisation chamber, sothat the area exposed to the influence of the X-rays can be made larger orsmaller. The instrument is new, and its practical value has yet to be proved.In theory it is certainly good. Lovibonds Tintometer (perfected by Dr. Dudley Corbett) provides avery accurate method of estimating the degree of coloration of the Sabouraud-
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FiG. 210.—Lovibonds tintometer, adapted and standardised for the accurate measurement ofthe colour-changes in the Sabouraud-Noire pastille by Dr. Dudley Corbett. (The Tinto-meter, Ltd.) Noire pastille. The apparatus consists of a tube or oblong viewing box,divided into two by a vertical partition, so that on looking through theeye-piece against the backgroimd two small white circles are seen. At thedistant end of the box are frames provided for the insertion of the glassstandards ; on the right for the colour tints, and on the left for a neutral tintif required. The use of the latter will be explained below. The backgroundis composed of pure white standard paper. In the backgromid support is LOVIBONDS TINTOMETER 289 cut a shallow groove or a hole for the pastille holder, depending on thetype used, so that the pastille can be examined without removal from itsholder. The tint of the pastille is thus compared with the standard inserted.It is possible to get such an exact match in tint

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