Radiation Physics

Question 1

What decrease in mAs is needed when switched from a single phase generator to a 3-phase, 6-pulse? A 3-phase, 12-pulse?

Answer 1

1. 2/3 the original mAs (for a 6-pulse)

2. 1/2 the original mAs (for a 12-pulse)

Question 2

What is radiographic latitude?

Answer 2

range of exposures that produce appropriate radiographic images.

• small changes at a low kVp will have a greater impact than small changes at a high kVp
• *low ratio grids allow more room for tube angulation error

Question 3

What type of crystal does the TLD monitor use?

Answer 3

Lithium fluoride

Question 4

Occupational dosimeters are valid for which three types of radiation?

Answer 4

1. x-ray
2. beta particles
3. gamma

Question 5

T/F: Alpha and Beta radiation are both electromagnetic radiation.

Answer 5

false; they’re particulate radiation