Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Dental R Unit I > Quiz 1 > Flashcards

Quiz 1 Flashcards

1
Q

Which of the following is impervious to the penetration
of x-rays?

A

Lead

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

The quality of energy that is produced by the central
x-ray is determined by the:

A

kVp

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

The size of the collimated x-ray beam for an intraoral
radiograph is measured at the patient’s skin at:

A

2.75 inches

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the purpose of the lead collimator in the
dental x-ray tube head?

A

Retards the size of the x-ray beam

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

The maximum protection for the patient is provided by a:

A

Lead shielded, open-ended P.I.D.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How does filtration of the x-ray beam protect the patient?

A

Elimination of weak wavelengths from the x- ray beam

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

A woman who is pregnant should:

A

Avoid x-rays during the first trimester of pregnancy.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Where does secondary radiation emanate from?

A

All of the above

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

When exposing an intraoral radiograph, where should
the operator stand in order to be in a protected area?

A

At least six (6) feet from the x-ray tube head

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Proper collimation for the film size and target–film distance will

A

Decrease the radiation received by the
patient.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

The quality, or penetrating power, of secondary radiation is

A

Less than that of primary radiation.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

To avoid exposure to secondary radiation, the operator should stand

A

At least 6_____ from the x-ray tube head

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

The dental assistant’s goal in radiation protection is zero occupational exposure. This is accomplished by

A
  1. Never holding the film for the patient.
  2. Always being 6 feet away from the machine.
  3. Working in a shielded area.
  4. Wearing a film badge.

all of the above

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

After each use, the lead lap apron must be

A

Draped over a support rod unfolded.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The best technique for reducing the radiation exposure to both patient and operator is the use of

A

Fast film

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

If the mA is increased while the kVp and the exposure time are kept constant, the resulting films will

A

Be darker

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

For maximum penetration of x-rays, which of the following combinations would you select?

A

90 kVp and 10 mA

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Which of the following is not a main component of a panoramic x-ray unit?

A

Panoramic film

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Why does digital radiograph require less radiation than traditional x-rays?

A

It uses lower wave-length radiation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Which type of radiation initially comes from the x rays tube?

A

Primary radiation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

A lead apron with a thyroid collar will protect a patient from what type of radiation?

A

Scatter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

The x-ray tube has a positive side called the anode and a negative side called:

A

Cathode

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

The production or boiling off of electrons from the heated tungsten filament is called:

A

Thermionic emission effect

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

The unit of measurement used to described the amount of electric current flowing through a circuit is called:

A

Ampere

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

The term used to describe the electric potential or force that drives an electric current through a circuit is called:

A

Voltage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

The target of the x-ray tube is also called the:

A

Focal spot

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

The x-ray at the center of the beam is referred to as the

A

Central ray

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

The quality or penetrating power of the x-ray beam is controlled by:

A

Kilovoltage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

The range _____ is used for the dental radiograph.

A

65 to 100 kVp

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

What determines the number of x-rays produced in a given exposure time period by controlling the heating of the tungsten filament?

A

Milliamperage

31
Q

Miliamperage higher than 15 would produce too many electrons bombarding the target and too much heat

A

True

32
Q

Federal regulations require that long non-penetrating rays are removed from the primary beam. This is accomplished by a:

A

Filter

33
Q

Federal regulation require that for dental x-ray machines operating above 70 kVp, the thickness of the filter must be

A

2.5 mm thick

34
Q

The size and shape of the x-ray beam as it leaves the tube head are restricted by

A

Collimator

35
Q

The diaphragm is made out of:

A

Lead

36
Q

According to federal regulations, the size and shape of the x-rays beam should not exceed ________in diameter.

A

2.75 inches

37
Q

The radiation that originates from the target of the x- ray machine is referred to as:

A

Primary radiation

38
Q

The radiation that results from the interaction of primary radiation with matter is called:

A

Secondary radiation

39
Q

The degree of blackness or darkness on a radiograph is referred to as:

A

Density

40
Q

The difference in the degree of blackness or darkness between adjacent areas on a processed radiograph is referred to as:

A

Contrast

41
Q

The object contrast is determinate by:

A

A. The thickness of the object
B. The density of the object
C. Chemical composition of the object
D. Quality of the x-ray beam
E. Scatter radiation
F. All of the above

42
Q

The image difference between the films produced at the different kVp choices in the dental range is the resulting contrast.

A

True

43
Q

High contrast film will appear:

A

Black and white and short scale

A and C

44
Q

As you increase your kVp, the contrast will:

A

Decrease

45
Q

Scatter radiation causes:

A

Film fog

46
Q

Film contrast is determined by:

A

A. The amount of radiation transmitted
B. The type of film
C. Intensifying screens
D. Film processing
E. All of the above

47
Q

The distance between the focal spot at the anode and the film in the patient’s mouth is referred to as:

A

A. Focal-film distance
B. Anode-film distance

Both

48
Q

The measurement of ionization in the air is referred to as:

A

Roentgen

49
Q

The radiation that is produced by the machine is referred to as:

A

Exposure

50
Q

Radiation that escapes through the protective shielding of the x-ray tube head is called:

A

Head leakage

51
Q

The operator should stand a minimum of ____feet away from the tube head.

A

6 feet

52
Q

The maximum permissible dose of whole body radiation for dental personnel is:

A

5 Rem per year

53
Q

The maximum whole body dose that a worker is allowed is:

A

100 millirem per week

54
Q

If the proper exposure time at 15 mA and 65 kVp is 0.25 seconds and an 8 inch FFD is used, what would the exposure time be at 16 inches?

A

1.0 seconds

55
Q

A ______ is a personnel monitoring device that can be worn by the staff to measure radiation received.

A

Dosimeter

56
Q

When an x-ray causes an electron to be ejected from its orbit, the effect is called:

A

Photoelectric effect

57
Q

When the electrons bombard the target in the x-ray tube, what percent of the energy produced is radiation?

A

1%

58
Q

When an x-ray causes an electron to be ejected from its orbit, it is called:

A

Ionization

59
Q

Primary radiation is the energy contained by the x- rays that come from the target of the x-ray tube.

A

True

60
Q

Secondary radiation is defined as radiation that comes from any matter being struck by primary radiation.

A

True

61
Q

The radiation dose is the measure of ionization that is in the air.

A

False

62
Q

The positive side of the dental x-ray tube is called the

A

ANODE

63
Q

The ___________ is the unit of measure used for
measuring the exposure the air.

A

ROENTGEN

64
Q

X-rays of longer wavelengths that have low penetration are called _____________.

A

SOFT X RAYS.

65
Q

The distance from the crest of one wave to the crest of another wave is called

A

WAVELENGTH.

66
Q

The legal limit of how long a dentist must keep a patient’s x-rays is _____ years.

A

7 years

67
Q

The x-ray at the center of the primary beam is called the

A

Central ray

68
Q

________________________ The electrical pressure or force that drives the current through a circuit of the x-ray machine.

A

VOLTAGE

69
Q

________________________
A unit of electromotive force or potential.

A

Volt

70
Q

_____ a device that is used to measure density and contrast

A

Step wedge

71
Q

________________________ A device used for
measuring the electromotive force across the x-ray tube.

A

VOLMETER

72
Q

_______________________ Electric device that is capable of increasing or decreasing voltage.

A

TRANSFORMER

73
Q

______________________Part of the primary beam that is permitted to emerge from the housing of the tube.

A

USEFUL RADIATION

Dental R Unit I (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions