Save
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account. Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Radiology

Chapter Six

TermDefinition
ALARA As low as reasonably achievable. Adopted as a culture and attitude of professionals who work with ionizing radiation to minimize radiation exposure and risks.
Collimation The restriction of the useful beam to an appropriate size. Intraoral beam diameter is collimated to 2 3/4 in. (7 cm) at the skin surface.
Half-Value Layer Thickness of a specified material that, when introduced into the path of a given beam of radiation, reduces the exposure rate by half.
Filtration The use of absorbers for selectively absorbing or screening out low-energy x-rays from the primary beam. See Added filtration, Inherent filtration, and Total filtration.
Total Filtration The combination of inherent and added filtration in an x-ray machine. Many states require a total filtration of 2.5 mm of aluminum equivalent for x-ray machines operating at or above 70 kVp.
Inherent Filtration Filtration built into the x-ray machine by the manufacturer. This includes the glass x-ray tube envelope, the insulating materials of the tube head, and the materials that seal the port.
Added Filtration Added to the inherent filtration built into the x-ray machine. In the form of thin disks, pure aluminum, which is inserted between the x-ray tube and lead collimator when the inherent filtration does not meet modern radiation safety requirements.
Lead Apron Protective barrier made of lead or lead-equivalent materials. Shields patients' gonadal areas from radiation during dental x-ray exposures.
Maximum Permissible Dose (MPD) The maximum accumulated dose that persons who are occupationally exposed may have at any given time of their life. Is not expected to cause detectable body damage. Currently established at 0.05 Sv per year (5 rem/year) whole body.
OSL
PID See Position indicating device.
Primary Beam The original undeflected useful beam of radiation that emanates at the focal spot of the x-ray tube and emerges through the aperture of the tube head.
Radiation Worker Professional who works with or around ionizing radiation or equipment that produces ionizing radiation.
Scatter Radiation Radiation that has been deflected from its path by impact during its passage through matter. This form of secondary radiation is scattered in all directions by the tissues of the patient's head.
Thermoluminescent Dosimeter (TLD) Monitoring device containing certain crystalline compounds (usually lithium fluoride) that store energy when struck by x-rays. When heated, the crystals give off light in proportion to the amount of radiation exposure.
Thyroid Collar An attached or detachable supplement to the lead apron. Contains 0.25 mm lead or lead-equivalent materials to protect the radiosensitive thyroid gland in the neck region during the exposure of intraoral radiographs.
Created by: daisenmurray
Popular Dentistry sets

 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards