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Radiation Safety for Patients and Operators Questions and Answers
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Radiation Safety for Patients and Operators
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Radiation Safety for Patients andOperators
Which of the following best describes acute exposures to radiation?
Genetic
Chronic
Short-term
Leukemia - answer Short term
If you decreased the distance and left the exposure factors the same, what impact
would this have on your dental? - answer The image would be darker because the
density increases
What is the least sensitive to radiation exposure? - answer Nerve cells
Which of the following is a true statement regarding pediatric exposures to radiation?
Uncooperative children require panoramic exposures.
Pediatric patients do not require images.
Immature tissues of pediatric patients are less susceptible to radiation than adult
patients.
A child may be seated in a parent's lap for exposures. - answerA child may be seated in
a parent's lap for exposures.
When is a lead apron used?
When performing a panoramic image
When producing a full mouth series
When performing a periapical exam
All of the above - answerAll the above
When x-ray exposure time is increased, there is __________density of the dental
image. - answerincreased
If you increased mA and left the other exposure factors the same, what impact would
this have on your dental image? - answerThe image would be darker because the
density increases.
What is an acceptable emission from the tubehead? - answerPrimary radiation
When the dental assistant becomes the patient, where is the radiation-monitoring badge
placed? - answerLeave it in a radiation-safe area outside of the radiology cubicle.
,Why is a rectangular PID preferred over a circular PID when exposing dental images? -
answerLimits the amount of radiation the patient receives
What steps should be followed when exposing a panoramic image? - answerInstruct the
patient to close the lips on the bite block and to swallow once and then place the tongue
against the roof of the mouth to maintain that position during exposure
The purpose of the intensifying screen in a panoramic cassette is to reduce -
answerradiation exposure.
Which of the following is not a patient protection measure that can be used before any
x-radiation exposure occurs? - answerUse of a lead apron
Which is an x-ray beam containing many different wavelengths of varying intensities? -
answerPolychromatic x-ray
You noticed that your patient moved just as you pressed the exposure button. What
affect will that have on your dental image? - answerAlteration in image sharpness
Which of the following causes cellular damage from x-radiation? - answerIonization
What type of illumination is allowed in the darkroom while opening a film packet? -
answerSafelight
Which statement is correct regarding filtration of the x-ray tubehead?
It refers to the placement of tungsten disks in the path of the x-ray beam between the
collimator and the tubehead seal.
It filters out shorter wavelength x-rays from the x-ray beam.
It results in a lower energy beam.
It results in a more penetrating, useful beam. - answerIt results in a more penetrating,
useful beam.
What represents the maximum permissible dose (MPD) for the general public? -
answer0.1 rem per year
What is the purpose of the receptor-holding device? - answerIt stabilizes the receptor
position in the mouth and reduces the chance for movement.
The collimator - answerRestricts the size and shape of the x-ray beam
Your last patient was an average size male. You next patient is a slender 12 year old
girl. What adjustment would you make, if any to the control panel when exposing dental
images? - answerDecrease the exposure time, leave the kV, and the mA the same
What factor is used to measure the penetrating power of radiation? - answerWavelength
, You have added an extension to your PID. The length of the PID is changing from 16 to
12 inches. How does this affect the intensity of the x-ray beam? What adjustment will
you need to make to keep the density of your images consistent? - answerThe resultant
beam will be two times as intense. You will need to decrease the exposure time.
You suspect your patient has caries. Which type of contrast would be the best when
looking for dental caries? - answerHigh contrast; few shades of gray
What is the purpose of including aluminum filtration inside the dental tubehead? -
answerTo remove the low energy x-rays from the beam
Which is the metal disk with a small opening located inside the position indicator device
in the path of the x-ray beam? - answerLead collimator
What type of receptor would produce the smallest patient dose of radiation? -
answerDigital sensor
Milliamperage controls heating of the __________ - answercathode
If you increased exposure time and left the other exposure factors the same, what
impact would this have on your dental image? - answerThe image would be darker
because the density increases.
An important way for the operator to avoid primary beam exposure is to: -
answerPosition himself or herself at a 90 to 135 degree angle to the primary beam
The following diagram depicts the correct positioning of the PID (position-indicating
device) ____________. - answerin the horizontal plane
Which of the types of PIDs do not produce scatter radiation? - answerRectangular and
round
What is the best way to protect yourself from exposure to x-radiation? - answerAvoid
the primary beam.
Which controls the quantity of an x-ray beam? - answerMilliamperes
The x-ray beam is restricted to a diameter of no more than __________ at the surface
of the skin. - answer7cm
Quality control tests that should be applied to dental office radiology standards should
include which procedure? - answerRegular maintenance
What term refers to the blurring that surrounds the edges of a radiographic image? -
answerPenumbra
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