Chapter 7 Flashcards
List the sources of potential radiation
Primary beam, scatter radiation, leakage radiation from the x-ray tube.
Define MPD.
The highest dose of radiation an occupationally exposed person can
receive without significant risk (5 rem/year for dental professionals).
Why should an operator wear a film badge? Can they be shared between
operators?
Monitors exposure to radiation; should not be shared between operators.
Know how to calculate the cumulative effective dose (CUMefd)
Formula: 10 mSv * age in years.
How can a dental office achieve zero exposure?
User proper sheilding, distance, and minimizing retakes.
Federal and state regulations require that every x-ray machine be equipped with what?
Must have a collimater and filtration to reduce radiation.
Shielding or barrier requirements are based on?
What formula is used to calculate the guide number?
Based on workload, distance. occupancy
Use of lead barriers
What can be found on a film badge report?
Shows the amount of radiation exposure received over a period.
What is occupancy factor?
Give an example of of each.
Refers to how often a space is occupied.
Areas occupied less frequently require less shielding .
What is the MPD for dental professionals? What is the MPD for a
pregnant dental professional?
5 rem/year; for pregnant professionals, it's 0.5 rem during the pregnancy.
How far must operators stand from the x-ray tubehead during exposure?
At least 6 feet away
Should a pregnant chairside worker fear radiation in the dental setting?
Why or why not?
Not necessary if proper precautions and protective measures are used.
Does ALARA apply to the patient or the operator? Or both?
Applies to both the patient and the operator.
