. Elementary and dental radiography . of the X-rays a shadow will be seen on the screen, because thelead in the penetrometer is opaque to X-rays. Whether the X-rays willpenetrate the metal in the holes depends on how much metal there is topenetrate and how penetrating the X-rays are. Thus the more penetrat-ing the rays the more holes can be seen. There are a great many different kinds of penetrometers. I shallnot describe them here, but will give the scale of the two most popular,the Benoist and the Walter, together with that of the Meyer ( Fig. 54). Benoist. Walter. Meyei Soft, or low tube 1—
. Elementary and dental radiography . of the X-rays a shadow will be seen on the screen, because thelead in the penetrometer is opaque to X-rays. Whether the X-rays willpenetrate the metal in the holes depends on how much metal there is topenetrate and how penetrating the X-rays are. Thus the more penetrat-ing the rays the more holes can be seen. There are a great many different kinds of penetrometers. I shallnot describe them here, but will give the scale of the two most popular,the Benoist and the Walter, together with that of the Meyer ( Fig. 54). Benoist. Walter. Meyei Soft, or low tube 1— 2 t i— 2 Medium 3— 5 2—3 3— 4 Hard or high 6—12 4—6 5—IO X-RAY TUBES AND THE X-RAYS 57 While the penetrometer is a very valuable appliance, it is far frombeing a necessity in the practice of dental radiography. As X-rays pass through the glass of the tube Secondary more X-rays are generated. These are known as Ray$. secondary rays. They are short and feeble and do not travel parallel with the direct X-rays, but pass. Fig. 56. High-frequency X-ray tube.
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