FILM SCREENS TERMS

Question 1

contain crystals of phosphors which emit lights when excited by x-rays

Answer 1

intensifying screens

Question 2

once they are hit with x-rays they continue to emit light (afterglow)

Answer 2

phosphorescence

Question 3

name this layer associated with the structure for intensifying screens?

made of plastic or cardboard

Answer 3

base

Question 4

name this layer associated with the structure for intensifying screens?

made of titanium dioxide which means faster screen have reflecting layers

Answer 4

reflecting or absorbing layer

Question 5

name this layer associated with the structure for intensifying screens?

varies in thickness and so it converts x-ray energy into visible light and spreads it out

Answer 5

phosphor layer

Question 6

name this layer associated with the structure for intensifying screens?

plastic cover that touches the film

Answer 6

protective layer

Question 7

the original screen phosphor

Answer 7

calcium tungstate

Question 8

gadolinium oxysulfide, lanthanum oxybromide, yitrium oxysulfide

Answer 8

rare earth elements

Question 9

percentage of x-ray photons absorbed by the screen

Answer 9

absorption efficiency

Question 10

number of light photons that are produced by each absorbed x-ray

Answer 10

conversion efficiency

Question 11

need to match the color sensitivity of the film to the type of screen used

Answer 11

spectral matching

Question 12

green sensitive is what type of spectral matching

Answer 12

orthochromatic film

Question 13

calcium tungstate emits blue and blue-violet light is what kind of spectral matching

Answer 13

blue-sensitive