radiation protection

Card Set Information

radiation protection
2010-10-06 18:01:19
week radiology

week 5 radiation protection radiography
Show Answers:

  1. who is responsible for prescribing the dental radiographs?
  2. what professional judgement does the dentist use to make a decision about? (3)
    • number
    • type
    • frequency
  3. T/F only some patients should be evaluated for dental radiographs on an individual basis.
    false! (every patient)
  4. what are the two types of filtration?
    • inherent filtration
    • added filtration
  5. what is inherent filtration?
    • when the primary beam passes through the glass window of the x-ray tube, insulating oil, and tubehead seal
    • =.5-1 mm aluminum
    • added filtration is required
  6. what is added filtration?
    • the placement of aluminum disks in the path of the x-ray beam between the collimator and the tubehead seal in the dental x-ray machine
    • aluminum disks can be added to the tubehead in .5 mm increments
  7. what is the purpose of aluminum disks?
    to filter out longer, low energy x-rays from the x-ray beam
  8. which wavelengths are harmful to the patient?
    low energy, long wavelengths
  9. T/F filtration of the x-ray beam results in a higher energy and more penetrating useful beam
  10. what is the total filtration amount required to be when using below 70 kVp?
    at least 1.5 mm aluminum filtration
  11. what is the total filtration required for operating a machine above 70 kVp?
    at least 2.5 mm aluminum filtration
  12. ________ is used to restrict the _______ and _______ of the x-ray beam to reduce patient exposure
    • collimation
    • size and shape
  13. what shapes can the lead of the collimator be?
    round or rectangle
  14. T/F a circular collimator produces a cone shaped beam that is 2.75 inches in diameter
  15. rectangle collimator is just larger than a size ____ film
  16. which pid shape is the most effective to reduce radiation exposure?
  17. round and rectangle come in ___ and ___ inches
    • 8
    • 16
  18. is a conical PID used?
  19. is a long or short pid preferred?
    long; less divergence of x-ray beam
  20. T/F the thyroid collar is used for both intraoral and extraoral films
    false! only intraoral films, but the lead apron is used for both