unit 2 - radt 146 (with Complete Solutions)

intensifying screen function correct answers convert x-ray energy into visible light what is latent image correct answers invisible image (remains like this until film is processed) layers of intensifying screens correct answers base reflective layer phosphor layer protective coating what is the base layer correct answers mechanically supports the phosphor/crystals made of high-grade cardboard/ polyester must be rugged, moisture resistant, chemically inert (doesn't interfere w phosphor), flexible, & no impurities what is the reflective layer correct answers **intercepts wayward light photons and redirects them back towards the film** light photons are nearly doubled what is light going isotropically? correct answers going in all different directions what is the phosphor layer aka correct answers active layer phosphor layer function correct answers contains crystals/phosphors emit light when struck by x-rays phosphor layer qualities correct answers high atomic # - high absorption rate high conversion efficiency - *minimal x-rays to produce max light* spectral matching - *film muse be sensitive/responsive to the light color being emitted from the screen minimal afterglow/screen lag spectral matching correct answers **the film that you use must be responsive to the same color light emitted by the screen** has NOTHING to do with film color afterglow/ screen lag correct answers screen continues to glow even after interaction w x-rays have ceased - BAD results in increased density, x-ray exposure, dark picture luminescence correct answers Any material that emits light in response to some outside stimulation phosphorescence correct answers continues to emit light after stimulation ceases