closest to the film,protects screen from damage,help eliminate static electricity
what does the phosphor layer do
active layer of screen
what are our screens made out of
lanthanum and yttranium
what converts the x-ray beam into light
the phosphor
what does the reflective layer do
increases the efficiency of the beam
what is isotopic emission
radiation with equal intensities in all directions.
what does the base do
mechanical support for phosphor layer
what is the base made out of
polyester
what is luminescence
the light emitted from the screen
what does luminescence do
excite the outer electrons and forms light as they fall back into place
what are the 2 types of luminescence
flouorescence and phosphorescence
what is flouorescence
if visible light is emitted,only when the phosphor is stimulated
what is phosphorescence
if the phosphor continues to emit light after stimulation(screen lag/afterglow)
what does the screen speed tell us
describes how efficiency x-rays are converted into light
what is the intensification factor
the ratio of the exposure require to produce the same optical density with a screen to the exposure required to produce a optical density without a screen
what is the intensification factor
IF=exposure required without screen------------------------------------ exposure required with screen
what is the cassette made of
plastic-low atomic# for minimal attenuation of the beam
MedTemCP5 Word+Pics
