. The American journal of roentgenology, radium therapy and nuclear medicine . he Kelley-Koett Company. 5 These rays are not homogeneous, but the mixture is always tne same. 31- Translations and Abstracts artistic radiographs can be made by adaptingthe penetrating power of the rays to the thick-ness of the part to be radiographed, but experi-ence shows that with a suitable compromise\^oltage (we ha^-e adopted that correspondingto a 5-in. spark between pointed electrodeswhich is equal to 57,500 volts eflfective, as actu-ally measured by a sphere gap) excellent radio-graphs can be made of all pa
. The American journal of roentgenology, radium therapy and nuclear medicine . he Kelley-Koett Company. 5 These rays are not homogeneous, but the mixture is always tne same. 31- Translations and Abstracts artistic radiographs can be made by adaptingthe penetrating power of the rays to the thick-ness of the part to be radiographed, but experi-ence shows that with a suitable compromise\^oltage (we ha^-e adopted that correspondingto a 5-in. spark between pointed electrodeswhich is equal to 57,500 volts eflfective, as actu-ally measured by a sphere gap) excellent radio-graphs can be made of all parts of the humanbody, and with a great simplification in appa- The reason for adopting for radiography theamount of energy corresponding to 10 ma. ata 5-in. spark was that it was the maximiimamount available in the tube when operatingfrom the Delco-light generator. This energy could, of course, have beentaken at any desired potential, as this wasmerely a matter of transformer design. Thereasons for choosing the potential correspond-ing to a 5-in. spark were: Given a certain. Fig. 4. Complete Portable Roentgen Ray Outfit. ratus and technic. The time factor becomesthe only variable and this is adapted to thethickness of the part to be radiographed. With 57,500 volts (effective) and 10 milliam-peres and a distance of cm. (18 in.) fromfocal spot to plate, the writers have found thatfor Seed plates and the average adult subject,the following table of expostires gives good re-sults : Exposures 18 in. distance Sec. Sec. Hand i Chest 10 Elbow 2 Hip 20 Ankle 2 Head-lateral. ... 25 Knee 4 Frontal 50 Shoulder 8 Too much weight should not be attached tothis table, as it is based on a relatively smallamount of work. It is merely given to show ina general way how the time of exposure variesfor different parts of the body when the inten-sity and penetrating power of the rays are heldconstant. The compromise voltage used for radiogra-phy appears well suited to fluoroscopy, and a
Size: 2407px × 1038px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidamericanjour, bookyear1906
