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Radiation Safety and Protection Exam Questions with Latest Update
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  • Radiation safety
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  • Radiation Safety

% of radiation exposure from background radiation Radon- __% space__% internal readionuclides 9% Terrestrial 7% - Answer-73/11 background radiation= ___mSv/yr - Answer-3.1 Effective Dose to average U.S. citizen from background radiations / year - ___ microsieverts (μSv) or __ mSv per yea...

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  • October 10, 2024
  • 8
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • radiation safety and protection exam questions wit
  • of radiation exposure from background radiation

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  • Radiation safety
  • Radiation safety

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Radiation Safety and Protection Exam
Questions with Latest Update
% of radiation exposure from background radiation
Radon- __%
space__%
internal readionuclides 9%
Terrestrial 7% - Answer-73/11

background radiation= ___mSv/yr - Answer-3.1

Effective Dose to average U.S. citizen from background radiations / year - ___
microsieverts (μSv) or __ mSv per year - Answer-3100/ 3.1

largest contributor of exposure on a daily basis - Answer-background radiation

is used to estimate risks in humans - Answer-effective dose

what two concepts should be considered during radiation safety during imaging -
Answer-balance the possible risks from the use of radiation against the benefits gained
gain max. amount of diag. info. with least amount of exposure

three principles of reducing dental exposure - Answer-justification
optimization
dose limitation

identify and prescribe the needed radiographs after clinical exam - Answer-justification

dentists must reduce unnecessary exposure to patients - ALARA (as low as reasonably
achievable) and themselves & staff - Answer-optimization

ALARA - Answer-As Low As Reasonably Achievable

use dose limits as guide Applies to dentists & staff - Answer-dose limitation

Every reasonable measure must be taken to
assure that the smallest amount of radiation possible is used for exposure. - Answer-
ALARA

Radiation workers including dentists
and staff who takes radiographs - Answer-Common public, receptionists & staff who do
not perform radiography

what are the two types of dose limits? - Answer-occupational and non occupational

, annual effective occupational dose /dose limits - Answer-50 mSv

lens of eye dose limit - Answer-absorbed dose of 50 mGy (excluding medical care)

t/f There are no limits on the exposure a patient receives from diagnostic examinations,
interventional procedures or radiation therapy; this is because these exposures are
made intentionally and for the direct benefit of the patient. - Answer-true

effective doses for sensor round collimation = about how many days of background
radiation - Answer-85-100/10-12

effective doses for PSP or F-speed film round collimation = about how many days of
background radiation - Answer-171-200/20-24

effective doses for D-speed film round collimation = about how many days of
background radiation - Answer-400/ 46-48

T/F patient selection criteria should be used for rad. protection - Answer-true

Dentists should ___ prescribe ___ dental radiographs at preset intervals for all
patients.Instead, they should prescribe radiographs ___ clinical exam, evaluation of
patient's needs and health history and susceptibility to dental diseases. - Answer-not/
routine/ after

Filtration of x-ray beam
Beam Collimation
Use of Beam Indicating devices (BID)
Use of Image receptor holding devices
Use of Faster image receptors that need less exposure time: digital receptors, insight
intraoral F-speed film, faster extraoral film-screen combination
Correct exposure parameters: time, mA & kVp
Use of Thyroid collars & protective aprons (lead)
Quality assurance protocol for technique, equipment, processing units and darkroom -
(fewer retakes).
Proper labeling, mounting and storage & viewing of images.
Correct Interpretation and diagnosis - Answer-factors that help reduce radiation
exposure for the patient

When x-ray beam is filtered with __ mm of aluminum, the skin exposure is reduced to
about ___% of that with no filtration
Scatter radiation is also reduced - Answer-3/ 20

restricts the size and shape of x-ray beam
Reduces field of exposure / skin surface exposure and radiation dose and scattered
radiation

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