Screens

Question 1

Screens absorb x ray photons and generate _________

Answer 1

Light

Question 2

Why is after glow undesirable

Answer 2

It is unwanted exposure

Question 3

What are the four anatomical layers of an x ray screen

Answer 3

1. Protective coating
2. Phosphor crystals
3. Reflective layer
4. Base

Question 4

Why are paired screens better than single screens

Answer 4

There’s twice as many crystals which gives photons a 2x greater chance of hitting a crystal to create exposure

Question 5

What are the two types of phosphors

Answer 5

Calcium tungstate
Rare earth

Question 6

Both calcium tungstate and rare earth phosphors absorb x rays well. Which one absorbs more than 4x the amount than the other

Answer 6

Rare earth

Question 7

Both calcium tungstate and rare earth phosphors emit blue light. Which one also emits a green light

Answer 7

Rare earth

Question 8

Continued light emission is…..

Answer 8

After glow

Question 9

Larger crystals emit __________ light and require _________ radiation and give minimal _______ ________

Answer 9

More
Less
After glow

Question 10

Larger crystals produce what kind of image quality

Answer 10

Grainy with less detail