Radiation safety and Protection - MT1 - 5Qs

Question 1

What are the 5 sources of radiation?

Answer 1

1. natural
2. Medical
3. Nuclear accidents
4. industry and research
5. Space flight

Question 2

Where does most natural radiation come from?

Answer 2

Radon

Question 3

What percent of the population dose to radiation is due to medical exposures?

Answer 3

50%

Question 4

What is the greatest source of radiation besides radon in the environment?

Answer 4

CT scans (“primary driver”)

Question 5

What are the 3 aspects of radiation protection?

Answer 5

1. Patient protection
2. Operator protection
3. Office personnelle/ general public protection

Question 6

What 2 factors in selection of image receptors will optimize reduction of patient dose?

Answer 6

1. Film Speed

2. Digital image receptor

Question 7

When taking FMX, What is the background equivalent for D film w. round collimator, E film with round collimator, D film with rectangular collimator, E film with rectangular collimator?

Answer 7

D/Round = 8 days
E/Round = 4 days
D/rectangular = 4 days
E/Rectangular = 2 days

Question 8

Does faster film produce more or less radiation?

Answer 8

Less

Question 9

Does round or rectangular collimator produce less radiation?

Answer 9

Rectangular

Question 10

Which results in more background radiation using same film and collimator, 4 BWs or 1 FMX

Answer 10

1 FMX = more radiation

Question 11

What is the time length for background radiation w BWs using E film and rectangular collimator? What about D film with round collimator?

Answer 11

E/Rectangular = 10 hours
D/Round = 2 days

Question 12

What percent reduction in patient does is achieved by using digital imaging?

Answer 12

50-70%

Question 13

Which receptor is smaller, film or digital receptor?

Answer 13

Digital receptor is smaller