X Rays An Introduction to the Study of Rntgen Rays
X Rays An Introduction to the Study of Rntgen Rays
George William Clarkson Kaye
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Now, by definition, A is proportional to the density of the image, i. E. To the amount of silver per unit area of film. Thus the ratio of two opacity-logarithms gives the ratio of the film densities, and therefore the ratio of the photographic energies in the two cases. The opacity meter is graduated to read directly in opacity-logarithms. In fluorescence methods the luminosity is matched against some standard fluorescence excited by a steady source of radiation such as radium. The drawback to ...such methods is that the fluorescing salt becomes " tired " under the action of the rays. The sensitivity of a screen may also vary con- siderably from point to point, so that it is difficult to make a fair comparison. Barium platinocyanide is the material commonly used to sensitise a fluorescent screen : recently, considerable improvements have been effected in the fluorescing ability of the salt. (5) Methods of Measuring Intensity used in Medicine. In the therapeutic use of X rays, various chemical re- actions brought about by the rays have been suggested and employed from time to time as aids to " dosage " ; for example, the discolouring of various alkaline salts (Holz- knecht, 1902) ; the liberation of iodine from a 2 per cent, solution of iodoform in chloroform 2 (Freund, 1904 ; Bordier and Galimard, 1906) ; the darkening of a photographic plate (Kienbock), see p.
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