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15 Cards in this Set
- Front
- Back
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How soon does radiation dissipate in a treatment room following a 5 impulse exposure?
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Immediately
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What is the unit of time to measure x-rays exposure?
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Impulses
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If kilovoltage is decreased with no other variations in exposure factors, the resultant film will.....
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Appear lighter
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The overall blackness or darkness of a film is termed:
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Density
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Identify which of the following is true concerning labial mounting:
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the patient's left is on your right
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Ionization occurs:
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When atoms lose electrons; they become deficient in negative charges and therefore behave as positively charged atoms
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Greater beam limitation is achieved when the PID is ______ and the diameter of the opening is ______.
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Longer, smaller
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What is the location in which thermionic emission occurs?
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Negative cathode
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What describes the use of a filter in a dental x-ray tubehead?
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A filter removes low-energy x-rays
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The differences in degrees of blackness between adjacent areas on a dental radiograph is termed:
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Contrast
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When viewed on a light source, a dental radiograph that demonstrates many shades of grey is said to have:
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Low contrast
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A variation in the true size and shape of the object being radiographed is termed:
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Distortion
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Radiation is the emission and propagation of energy through space or a substance in the form of waves or particles. Radioactivity can be defined as the process by which certain unstable atoms or elements undergo spontaneous disintegration, or decay, in an effort to attain a more balanced nuclear state.
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Both statements are True
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General Radiation...........
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Is also known as braking (bremsstrahlung) radiation. It is the source of the majority of x-rays that are produced.
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The premolar bitewing radiograph should be placed to include what in anatomical structures?
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The distal half of the maxillary canine crown
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