Cardinal Principles

Question 1

Cardinal Principles in Radiation Protection are foundational guidelines designed to minimize exposure to ionizing radiation for both (1) and the (2)

Answer 1

1. radiation workers
2. General public

Question 2

3 Cardinal Principles of radiation protection

Answer 2

Time, distance, shielding

Question 3

Exposure formula

Answer 3

Expo rate x expo time

Question 4

Significance of time in radiography vs fluoroscopy

Answer 4

Radphy: minimize time to reduce motion blur
Fluoroscopy: minimize time to reduce pt and personnel exposure

Question 5

Isoexposre lines show:

Answer 5

1. how radn scatter from the pts
2. where dose rate is higher/ lower
3. how distance and angle from the pt affects exposure

Question 6

Technique for minimizing exposure (maximizing distance)

Answer 6

Go behind the radiologist and take 2 steps back, then 1 step to the side

Question 7

The quantity of XRs generated per week

Answer 7

Workload (W)

Question 8

Fraction of time that the beam is directed at a perpendicular barrier

Answer 8

Use Factor (U)

Question 9

U for secondary radn

Answer 9

always 1

Question 10

Fraction of time a nearby area is occupied by peopl

Answer 10

Occupancy Factor (T)