. A text-book of radiology . ith a protective shieldfor the tube. The Stand here shown, completely fitted, Fig. 37, issuitable for nearly all classes of work, and anyone start-ing to practice radiography would do well to have sucha one as this. After having become fairly proficient and experiencedit will be time enough to thing about selecting one of themany more elaborate and expensive forms to be had fromthe various makers. It is necessary to have an X-ray proof shield aroundthe tube itself, and the stand will need to have a fairlyheavy foot, so as to give the necessary stability; but thisis
. A text-book of radiology . ith a protective shieldfor the tube. The Stand here shown, completely fitted, Fig. 37, issuitable for nearly all classes of work, and anyone start-ing to practice radiography would do well to have sucha one as this. After having become fairly proficient and experiencedit will be time enough to thing about selecting one of themany more elaborate and expensive forms to be had fromthe various makers. It is necessary to have an X-ray proof shield aroundthe tube itself, and the stand will need to have a fairlyheavy foot, so as to give the necessary stability; but thisis not so essential if the shield is made of wood and lined ■with rubber which has been impregnated with lead we shall presently be considering the question ofprotection of both operator and patient from anyundesired influence of the rays, it may be here stated 90 TUBE SHIELDS. 91 that under no circumstances should an unshielded tube beused for any purpose. The nicest shields to work with are those of glass, con-. Fig. 37. Tube Stand. taining a large proportion of lead. This is often spokenof as English glass, and is that used in the manu-facture of cut-glass decanters, bowls, etc. It is very 92 TEXT-BOOK OF RADIOLOGY. white and transparent and shows no green when viewedfrom the edge. One, suitable for a large tube and thickenough to cut off at least 80 per cent, of the rays, is very-heavy, and the stand must be made correspondinglystrong to carry it with safety. Tube stands are alsomade to carry not only atube shield but also tubularand other diaphragms, andmay be used to compressthe part under examina-tion. This reduces thethickness and ensuressteadiness of the part. Becleres stand is one ofthis kind, and very excellentwork can be done with it,but it is not suited forstereoscopic radiography,as one of the supportingpillars is in the way. A modification with onlyone pillar gets over thisdifficulty. It is cheaperthan the original pattern,but not so rigid. (Fig. 38.)
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