Protection

Question 1

Dental Image Regulations

Answer 1

ADA, FDA

Question 2

Filtration

Answer 2

removes low energy, less penetrating, longer wavelength x-rays

Question 3

Inherent Filtration

Answer 3

when x-ray passes through glass window (not enough, additional filtration required)

Question 4

Aluminum Disks

Answer 4

additional filtration located between collimator and tubehead

Question 5

Total Filtration

Answer 5

sum of inherent and added filtration, regulated by state/federal law

Question 6

Machines below 70kVp

Answer 6

require 1.5mm aluminium filtration

Question 7

Machines above 70kVp

Answer 7

require 2.5mm aluminum filtration

Question 8

Collimation

Answer 8

restricts size/shape of beam; diameter restricted to 2.75 inches at patients skin

Question 9

Lead Apron

Answer 9

state law requires use; minimum thickness .25mm

Question 10

F-Speed

Answer 10

if using film, the faster the speed the less radiation/exposure

Question 11

Other protectors

Answer 11

PID, film holding devices (RINN), lead aprons/collars, digital vs film, film handling, perscribed radiographs (risk/benefit)

Question 12

Maximum Permissible Dose

Answer 12

[MPD]; occupational = 50mSv or 5.0rem /year; non-occupational = 1mSv or .1rem / year

Question 13

NCRP

Answer 13

National Council on Radiation Protection and Measurements - published MPD standards

Question 14

ALARA

Answer 14

“As Low As Reasonably Achievable”

Question 15

Cumulative Occupational Dose

Answer 15

workers age x 10mSv