. The American journal of roentgenology, radium therapy and nuclear medicine . of square feet ofsupport must be coated daily, requires greatcare and vigilance in order to produce a uni-formly high quality product. In the case offilms, they are coated in great rolls aboutforty inches wide, which must be dried be-fore they can be re-rolled and handled. Inthe making of Dupli-Tized films, the firstcoating must be put on, dried, and the entirelength rolled up before the second coatingcan be put on the reverse side. After theselarge rolls of film are dried they must bekept under uniform conditions o
. The American journal of roentgenology, radium therapy and nuclear medicine . of square feet ofsupport must be coated daily, requires greatcare and vigilance in order to produce a uni-formly high quality product. In the case offilms, they are coated in great rolls aboutforty inches wide, which must be dried be-fore they can be re-rolled and handled. Inthe making of Dupli-Tized films, the firstcoating must be put on, dried, and the entirelength rolled up before the second coatingcan be put on the reverse side. After theselarge rolls of film are dried they must bekept under uniform conditions of tempera-ture and humidity until they are sent out tothe consumer, whether they are Dupli-Tizedfilms, dental films, motion picture films orKodak films, and the package in each casemust be designed with a view toward havingthem reach the consumer in the same condi-tion as when they are made. In the manufacture of Seed A^-Ray Platesthe same general type of emulsion is used asfor Dupli-Tized films; that is, it is specially Manufacture of Roentgenolog-ical Films and Plates 135. Fig. 3-b. Silver Nitrating Room. 136 Manufacture of Roentgenological Films and Plates prepared with a view toward having it assensitive to .I-rays as possible, its sensitive-ness to ordinary light being of no specialimportance. The glass must be carefullyAvashed and put in proper condition for be-ing coated with the sensitive emulsion. After in the case of either films or plates for theirentire life history. Temperatures over 70°F. should be avoided where possible, as wellas excessive humidity. These two are thegreatest foes to emulsion keeping. When one considers, however, the vast
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