X Rays An Introduction to the Study of Rntgen Rays
X Rays An Introduction to the Study of Rntgen Rays
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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.
What to read after X Rays An Introduction to the Study of Rntgen Rays?
You can find similar books in the "Read Also" column, or choose other free books by George William Clarkson Kaye to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
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.
What to read after X Rays An Introduction to the Study of Rntgen Rays?
You can find similar books in the "Read Also" column, or choose other free books by George William Clarkson Kaye to read onlineMoreLess
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