. Dental and oral radiography : a textbook for students and practitioners of dentistry . e,and this is accomplished by means of the tube shield,compression diaphragm, and compression cylinder. The tube shield (Fig. 30), a sectional diagram of whichis shown in Fig. 29-Z> by TS is made of leaded glass,there being a sufficient amount of lead in the glass toprevent ordinary rays from passing through it. Thecompression diaphragm makes up the floor of the tubeshield (D), and is constructed of sheet lead with an open-ing of the proper size to alloAv the desired rays to passthrough. The compression
. Dental and oral radiography : a textbook for students and practitioners of dentistry . e,and this is accomplished by means of the tube shield,compression diaphragm, and compression cylinder. The tube shield (Fig. 30), a sectional diagram of whichis shown in Fig. 29-Z> by TS is made of leaded glass,there being a sufficient amount of lead in the glass toprevent ordinary rays from passing through it. Thecompression diaphragm makes up the floor of the tubeshield (D), and is constructed of sheet lead with an open-ing of the proper size to alloAv the desired rays to passthrough. The compression cylinder (CC) (Fig. 29-C) ismade of aluminum with a lead lining or leaded glass REQUISITES OF DENTAL X-EAY LABORATORY 73 which serves the purpose of absorbing any secondaryrays that have succeeded in passing through the dia-phragm. It should be apparent to anyone that withthis apparatus, the only x-rays that succeed in leav-ing the immediate area of the tube are those that areused to cast the shadows of the parts desired, which isof great importance, not only in obtaining radiograms. Fig. 30.—Leaded glass tube shield. that are sharp and clear and uniform, but also to thehealth of the operator and others associated with him inthe office.* Arrangement of the Apparatus in the Office If dental x-ray equipment is desired, the question nat-urally arises, Where can the necessary apparatus beplaced? While a separate room is desirable, it is byno means necessary, as the ordinary operating room ofhealthy size can be made to accommodate it. The x-ray machine and the tube stand can be placed The possible injurious effects of x-ray are discussed in the last chapter. 74 DENTAL AND ORAL RADIOGRAPHY againsl the wall at the left of the room, while any extratubes can be hung in a suitable rack upon the wall wherethey will be out of harms May (Fig. 31). Arranged inthis manner, x-ray apparatus is not in the way, and isaccessible for use at any time. The dental chair with its multitude of adjust
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