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Quiz CH 38

TermDefinition
The component of the x-ray machine that functions in positioning the tubehead is the extension arm.
All the following are true of electromagnetic radiation except they contain radioactive substances such as uranium.
How well the image reproduces fine detail or distinct outlines of an object is called sharpness.
What happens when the exposure button is engaged? The high-voltage circuit is activated. Kilovolts drive the electrons to the target. Electrons slam against the target producing the x-ray.
An example of cumulative radiation exposure is cataracts. leukemia. cancer.
All of the following structures will appear radiolucent on dental x-ray film except metal restorations.
Who should hold the film in a patient’s mouth if the patient is unable to do so? Parent or relative of the patient
When in storage, the lead apron should be hung. draped over a bar.
The term ____________ is used to describe areas that appear dark on the image; ___________ is the term used to describe areas that appear white or light gray. radiolucent; radiopaque
An exposure time of 1/4 second is equal to _____ impulse(s). 15
A good technique for reducing the radiation exposure to both patient and operator is the use of fast film or digital imaging.
The lead collimator is used to restrict the size and shape of the primary beam.
All the following are true statements about film badges except they should be worn when any form of x-ray is taken.
Thermionic emission refers to the release of electrons from the tungsten filament.
Primary radiation is also called the useful beam. the beam of x-rays that comes from the target.
When the master switch is on the electron cloud is created around the tungsten filament.
The x-ray was discovered in 1895 by Wilhelm Conrad Roentgen.
The heart of the x-ray generating system is the x-ray tube.
Because the entire x-ray area is considered a radiation hazard area, a radiation hazard sign must be posted in sight of patients. sight of personnel.
A lead apron and a thyroid collar must be used on all patients for all exposures.
Chronic radiation exposure occurs when _____ doses of radiation are received over a _______ time period. small; long
The uses of dental images include the detection of abnormalities in surrounding hard and soft tissues.
The dentist who is credited making the first dental radiograph in 1895 is Otto Walkhoff.
Which of the following is the name for the primary kind of radiation produced in the dental x-ray tubehead? Braking radiation
In dentistry, the __________ the wavelengths of the x-rays, the greater their energy and their usefulness. shorter
A step-down transformer is necessary within the x-ray circuitry to boil off electrons from the filament.
Which of the following terms is used to describe the energy or penetrating ability of the x-ray beam in dental radiography? Quality
One of the rules of radiation protection is never stand closer than ______ feet from the x-ray unit during an exposure unless you are behind a barrier. 6
How much filtration is federally required for a dental x-ray machine operating over 70 kVp? 2.50 mm
The range of shades of gray between black and white on an image is called contrast.
Created by: ARIGON5248
 

 



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