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Radiographs

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-513

2025-12-23

583

While the X-rays pass through flesh with very little difficulty, the bones offer much obstruction. This makes it possible to locate the position of the bones by means of X-ray photographs, or radiographs (Fig. 1). The radiographs are of great help to the surgeon in setting a broken bone or in locating a foreign body, as a bullet or needle (Fig. 1). They are of great help to dentists also.

FIG. 1. - Radiograph of a Foot, showing a Broken Needle Embedded in the Flesh

Several forms of Crookes tubes are capable of giving off the X-rays. In the forms called focus tubes (Fig. 2), the cathode rays are brought to a focus on a platinum plate turned at such an angle that the rays are sent out radially through the glass. Devices are also employed to regulate the vacuum automatically, for otherwise it would become higher with use, until the current would no longer pass.