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- W2108332031 abstract "The secondary radiation, due to the scattering of the X rays penetrating an object, is a great disadvantage in radiographic work. To avoid this two different kinds of screening have been used, the primary diaphragm, usually placed in contact with the tube, and the secondary diaphragm, placed between the object (patient) and the film cassette (Potter-Bucky diaphragm and the Lysholm grid). The principle of the primary diaphragm depends on the fact that the smaller the diameter of the X-ray beam, the fewer the number of the secondary rays. If using a very small diaphragm, so that the X-ray beam penetrating the object has only a diameter of 2 cm., the secondary radiation will be almost avoided, and the picture on the film very clear with excellent contrast. This is thus the better method of avoiding the secondary radiation. Unfortunately, however, it has only little practical value, because the pictures obtained in this manner will be of too small size—it is impossible to examine the whole field of a wide are..." @default.
- W2108332031 created "2016-06-24" @default.
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- W2108332031 date "1945-08-01" @default.
- W2108332031 modified "2023-09-27" @default.
- W2108332031 title "A New Method of Using Primary Screening" @default.
- W2108332031 doi "https://doi.org/10.1259/0007-1285-18-212-247" @default.
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