||X-Ray Fluoroscopic Screens-History, Crystal Kinetics, Preliminary Report on Aging.
Properzi, William S. ;
Trou, Dale ;
||Bureau of Radiological Health, Rockville, Md. Div. of Medical Radiation Exposure.
( Fluoroscopes ;
Fluoroescent screens) ;
( Fluorescent screens ;
Radiation damage ;
Phosphorescent materials ;
||Some EPA libraries have a fiche copy filed under the call number shown.
A preliminary report is made on a long-range study of the factors which reduce the light output of fluoroscopic screens. New screens are being exposed to x-rays, sunlight, incandescent lamps and fluorescent lamps. The light output of these screens is measured monthly. Comparative measurements are also being made on older screens. These measurements indicate that the new phosphors and technological advances over a 40-year period have enabled a decrease in patient exposure by a factor of eight to ten. Based on the study results, it is recommended that all fluoroscopic screens made before 1947 should be replaced with screens incorporating the new phosphors and technological advances. (Author)