EX1; Radiation Safety and Protection

Question 1

How much do medical exposures account for the population dose of radiation

Answer 1

approximately half

Question 2

What is the primary driver for medical exposure radiation

Answer 2

CT scans

Question 3

What can dental providers do to optimize our image receptors to reduce patient dose

Answer 3

film speed

digital image receptors

Question 4

Which shape of X-ray film is better, rectangular or round

Answer 4

rectangular, the emit the least amount of background radiation

Question 5

How much can digital imaging system reduce the radiation dose

Answer 5

50-70%

Question 6

This optimizes the shape of the field of view to minimize exposure to healthy tissues

Answer 6

rectangular collimation

Question 7

This shape of collimation is about 50% bigger than a size 2 film

Answer 7

round

Question 8

This shape of collimation requires the best technique

Answer 8

rectangular (since its smaller)

Question 9

Why is a longer collimation device ideal

Answer 9

less divergence of the cone

Question 10

This should be used to minimize any unnecessary radiation; specifically scattered radiation

Answer 10

leaded apron (although there is no lead in it)

Question 11

What can be used to hold the image receptor

Answer 11

positioning devices

Question 12

What makes a positioning device ideal regarding an image receptor

Answer 12

ease of use
stability
reduces radiation exposure

Question 13

Who could be the only person to hold the image receptor

Answer 13

the patient’s guardian

Question 14

What is the main thing to ensure when using the tube head

Answer 14

it should be stable unassisted

Question 15

Where is leakage radiation most likely to be found

Answer 15

around the X-ray tube

Question 16

What are some leakage exposure for panoramic and intraorals

Answer 16

panoramic; 25 mrad/hr at 1 m

intraoral; 10 mrad/hr and 1 m

Question 17

True or False

Portable X-ray units are legal in ohio, but not all states

Answer 17

True; must use special safety procedures

Question 18

How is protection of office staff and dose reduction of personnel performing X-ray procedures accomplished

Answer 18

proper facility design

Question 19

A primary protective barrier of radiation absorbing material is used to reduce radiation exposure of what

Answer 19

primary or unstable beam of radiation

Question 20

A secondary protective barrier of radiation absorbing material is used to reduce radiation exposure of what

Answer 20

secondary or leakage radiation

Question 21

If there is no barrier, then where should the operator go

Answer 21

should leave the room or stand at least 6 feet away; 90º to 135º to central ray
(inverse square law)

Question 22

This is to ensure that the dentist, auxiliary personnel, and other people in the vicinity of dental office are not exposed to radiation exceeding certain limits

Answer 22

structural shielding design

Question 23

True or False

conventional building materials may provide adequate radiation shielding for dental radiographic equipment

Answer 23

True

Question 24

What can be used to accomplish monitoring personnel for radiation exposure

Answer 24

film badges
TLD chips
OSL dosimeters
commercial services; NVLAP*

Question 25

This is a passive measure of assurance that radiation exposures of staff are low

Answer 25

the use of radiation badges

Question 26

What 3 main things must active radiation protection take the lead role

Answer 26

technique
engineering controls
procedures

Question 27

In what special circumstances should the operator, etc. be aware of

Answer 27

pregnancy