The Principles of Radiography
The Principles of Radiography
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In our eReader you can find the full English version of the book. Read The Principles of Radiography Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Principles of Radiography
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To quickly assess the difficulty of the text, read a short excerpt:
In the absence of the stop S these rays would reach the plate P and obviously produce a con- . , ,, 5, , FIG. 45. Effect of a diaphragm.
siderable degree of general foggi- ness. The stop S, however, stops a large proportion of these rays, and the smaller it is, and the nearer to the tube, the greater will its effect be. In practice the improvement pro- duced is very striking, small foreign bodies, for example, such as needles, which may be quite invisible when the aperture is large, showing up ...plainly when the diaphragm is nearly closed. The diaphragms supplied are often of the " iris diaphragm " type. This type, however, is not satisfactory, for two reasons. In the first place the aperture is always practically a circle, and it frequently happens that a circle is not the figure which fits most closely the part we wish to radiograph. In the second place the metal sectors of the iris diaphragm must necessarily be kept fairly thin, and they are very rarely sufficiently opaque no THE X-RAY INSTALLATION to the rays to form a really efficient screen.
What to read after The Principles of Radiography?
You can find similar books in the "Read Also" column, or choose other free books by James Arnold Crowther to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
In the absence of the stop S these rays would reach the plate P and obviously produce a con- . , ,, 5, , FIG. 45. Effect of a diaphragm.
siderable degree of general foggi- ness. The stop S, however, stops a large proportion of these rays, and the smaller it is, and the nearer to the tube, the greater will its effect be. In practice the improvement pro- duced is very striking, small foreign bodies, for example, such as needles, which may be quite invisible when the aperture is large, showing up ...plainly when the diaphragm is nearly closed. The diaphragms supplied are often of the " iris diaphragm " type. This type, however, is not satisfactory, for two reasons. In the first place the aperture is always practically a circle, and it frequently happens that a circle is not the figure which fits most closely the part we wish to radiograph. In the second place the metal sectors of the iris diaphragm must necessarily be kept fairly thin, and they are very rarely sufficiently opaque no THE X-RAY INSTALLATION to the rays to form a really efficient screen.
What to read after The Principles of Radiography?
You can find similar books in the "Read Also" column, or choose other free books by James Arnold Crowther to read onlineMoreLess
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