Question 1

The heart of the x-ray generating system is the:

Accepted Answer

A)  x-ray tube.
B)  insulating oil.
C)  transformer.
D)  position indicator device.

Question 2

The dentist says that the image has too much contrast; he would like to see more gray values.What adjustment would you make?

Accepted Answer

A)  Increase mA.
B)  Increase kVp.
C)  Decrease kVp.
D)  Decrease mA.

Question 3

What happens when the exposure button is engaged?

Accepted Answer

A)  The high-voltage circuit is activated.
B)  Kilovolts drive the electrons to the target.
C)  Electrons slam against the target producing the x-ray.
D)  All of the above are correct.

Question 4

Damage caused by ionizing x-radiation to genetic cells:

Accepted Answer

A)  affects only the person being exposed.
B)  can affect future generations.
C)  affects only the dental assistant.
D)  affects the cells of the eye, skin, and oral mucosa.

Question 5

A good technique for reducing the radiation exposure to both patient and operator is the use of:

Accepted Answer

A)  a lead apron.
B)  thinner films.
C)  fast film or digital imaging.
D)  an automatic processor.

Question 6

The function of the filtration discs are used to _____ and are made of ______.

Accepted Answer

A)  remove long wavelengths from the beam; aluminum
B)  remove long wavelengths from the beam; copper
C)  restrict the size of the beam; lead
D)  restrict the size of the beam; aluminum

Question 7

Which of the following tissues has the highest radiation sensitivity?

Accepted Answer

A)  Small lymphocytes
B)  Salivary gland
C)  Kidney
D)  Muscle tissue

Question 8

The component of the x-ray machine that functions in positioning the tubehead is the:

Accepted Answer

A)  kilovoltage selector.
B)  control panel.
C)  extension arm.
D)  cathode.

Question 9

The penetrating power of the x-ray beam is controlled by the settings on the:

Accepted Answer

A)  impulse timer.
B)  kilovolt setting.
C)  milliamp setting.
D)  All of the above are correct.

Question 10

The portion of the x-ray machine that supplies the electrons to produce x-rays is the:

Accepted Answer

A)  cathode.
B)  anode.
C)  control panel.
D)  focusing cup.

Question 11

The location where x-rays are produced in the x-ray tube is called the:

Accepted Answer

A)  focal spot.
B)  filament.
C)  window.
D)  PID.

Question 12

The uses of dental images include the detection of:

Accepted Answer

A)  incipient occlusal lesions.
B)  periodontal probing depths.
C)  bone loss in its early stages.
D)  percussion sensitivity as part of endodontic evaluation. C

Question 13

How much filtration is federally required for a dental x-ray machine operating over 70 kVp?

Accepted Answer

A)  2.75 mm
B)  2.50 mm
C)  2.25 mm
D)  0.5 mm

Question 14

Chronic radiation exposure occurs when _____ doses of radiation is received over a ____ time period.

Accepted Answer

A)  large; short
B)  large; long
C)  small; short
D)  small; long

Question 15

Heat is reduced from the target by:

Accepted Answer

A)  insulating oil.
B)  copper stem.
C)   aluminum filter.
D)   both a and b.
E)   both b and c. D

Question 16

A patient is concerned with radiation exposure.You can assure him that your office uses the ALARA concept,which includes:

Accepted Answer

A)  reducing the number of exposures.
B)  minimizing retakes.
C)  keeping exposures levels as low as possible.
D)  all of the above.

Question 17

The council that determines the radiation effects and levels tolerable for humans is the:

Accepted Answer

A)  American Dental Association (Council on Radiation Safety) .
B)  American Dental Association (Council on Dental Materials) .
C)  National Council on Radiation Protection and Measurements.
D)  All of the above are correct. C

Question 18

Dental imaging:

Accepted Answer

A)  refers to film-based images.
B)  refers to digitally produced images.
C)  detects conditions that might otherwise remain undetected.
D)  is all of the above.

Question 19

Primary radiation is:

Accepted Answer

A)  also called the useful beam.
B)  the beam of x-rays that comes from the target.
C)  less penetrating than secondary radiation.
D)  both a and b

Question 20

An exposure time of 1/2 second is equal to _____ impulse(s) .

Accepted Answer

A)  1/2
B)  12
C)  30
D)  2

Exam 38: Foundations of Radiography, Radiographic Equipment, and Radiation Safety

The heart of the x-ray generating system is the:

Correct AnswerverifiedShow Answer

The dentist says that the image has too much contrast; he would like to see more gray values.What adjustment would you make?

Correct AnswerverifiedShow Answer

What happens when the exposure button is engaged?

Correct AnswerverifiedShow Answer

Damage caused by ionizing x-radiation to genetic cells:

Correct AnswerverifiedShow Answer

A good technique for reducing the radiation exposure to both patient and operator is the use of:

Correct AnswerverifiedShow Answer

The function of the filtration discs are used to _____ and are made of ______.

Correct AnswerverifiedShow Answer

Which of the following tissues has the highest radiation sensitivity?

Correct AnswerverifiedShow Answer

The component of the x-ray machine that functions in positioning the tubehead is the:

Correct AnswerverifiedShow Answer

The penetrating power of the x-ray beam is controlled by the settings on the:

Correct AnswerverifiedShow Answer

The portion of the x-ray machine that supplies the electrons to produce x-rays is the:

Correct AnswerverifiedShow Answer

The location where x-rays are produced in the x-ray tube is called the:

Correct AnswerverifiedShow Answer

The uses of dental images include the detection of:

Correct AnswerverifiedC

How much filtration is federally required for a dental x-ray machine operating over 70 kVp?

Correct AnswerverifiedShow Answer

Chronic radiation exposure occurs when _____ doses of radiation is received over a ____ time period.

Correct AnswerverifiedShow Answer

Heat is reduced from the target by:

Correct AnswerverifiedD

A patient is concerned with radiation exposure.You can assure him that your office uses the ALARA concept,which includes:

Correct AnswerverifiedShow Answer

The council that determines the radiation effects and levels tolerable for humans is the:

Correct AnswerverifiedC

Dental imaging:

Correct AnswerverifiedShow Answer

Primary radiation is:

Correct AnswerverifiedShow Answer

An exposure time of 1/2 second is equal to _____ impulse(s) .

Correct AnswerverifiedShow Answer

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The function of the filtration discs are used to _ and are made of __.

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C

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Chronic radiation exposure occurs when _ doses of radiation is received over a time period.

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D

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C

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