Deck 3: Radiation Characteristics

Question 1

When kilovolt peak is increased, a:

A) Lower-energy x-ray beam with increased penetrating ability results.
B) Lower-energy x-ray beam with decreased penetrating ability results.
C) Higher-energy x-ray beam with increased penetrating ability results.
D) Higher-energy x-ray beam with decreased penetrating ability results.

Answer 1

Higher-energy x-ray beam with increased penetrating ability results.

Question 2

____ is a measurement of force that refers to the potential difference between two electrical charges.

A) Exposure time
B) Wavelength
C) Voltage
D) Ampere

Answer 2

Voltage

Question 3

Which of the following statements is true of the use of voltage in dental x-ray equipment?

A) Dental x-ray equipment requires the use of 3 to 5 volts.
B) Dental x-ray equipment requires the use of less than 65 kilovolts.
C) Dental x-ray equipment requires the use of more than 100 kilovolts.
D) Dental x-ray equipment requires the use of 65 to 100 kilovolts.

Answer 3

Dental x-ray equipment requires the use of 65 to 100 kilovolts.

Question 4

In regard to increasing density:

A) An increase in either kVp or mA will increase density.
B) An increase in kVp will increase density, but an increase in mA will not increase density.
C) An increase in mA will increase density, but an increase in kVp will not increase density.
D) Neither an increase in kVp nor an increase in mA will increase density.

Question 5

According to the inverse square law, if the length of the PID is doubled, the resultant beam is ____ as intense.

A) four times
B) twice
C) half
D) one quarter

Question 6

When the voltage is increased:

A) Electrons move from the anode to the cathode with more speed.
B) Photons move from the anode to the cathode with more speed.
C) Electrons move from the cathode to the anode with more speed.
D) Photons move from the cathode to the anode with more speed.

Question 7

In dental radiography, the term ____ is used to describe the mean energy or penetrating ability of the x-ray beam.

A) quality
B) quantity
C) intensity
D) wavelength

Question 8

When contrasted with the use of 65 kV to 75 kV for dental x-rays, the use of 85 kV to 100 kV produces:

A) More penetrating dental x-rays with longer wavelength.
B) Less penetrating dental x-rays with longer wavelength.
C) More penetrating dental x-rays with shorter wavelength.
D) Less penetrating dental x-rays with shorter wavelength.

Question 9

Which of the following statements is/are true of wavelength in reference to radiation?

A) X-rays with longer wavelength have less penetrating power.
B) X-rays with longer wavelength have more penetrating power.
C) X-rays with longer wavelength are more likely to be absorbed by matter.
D) Both a and c.

Question 10

Aluminum filters are used to remove ____-energy, ____ -wavelength x-rays.

A) low; longer
B) high; longer
C) low; shorter
D) high; shorter

Question 11

A film with "low" contrast (greater or equal to 90 kVp):

A) Is useful for the detection of periodontal or periapical disease.
B) Is useful for the detection and progression of dental caries.
C) Has many shades of gray.
D) Both a and c.

Question 12

Milliamperage regulates the ____ of electrons produced at the cathode filament.

A) quality
B) quantity
C) speed
D) power

Question 13

Using 10 mA with an exposure time of 3 seconds would result in 30 mAs. If the milliamperage is increased to 15, the time must be decreased to ____ seconds to maintain the same density of the exposed radiograph.

A) 0.5
B) 1
C) 1.5
D) 2

Question 14

The kVp represents:

A) The mean x-ray tube voltage.
B) The mean filament voltage.
C) The maximum or peak voltage of an alternating current.
D) The maximum or peak voltage of a direct current.

Question 15

Exposure time is measured in:

A) kVp
B) Milliamperage
C) Density
D) Impulses

Question 16

The quantity of the x-rays produced is controlled by:

A) Voltage
B) Kilovoltage
C) Kilovoltage peak
D) Milliamperage

Question 17

According to the inverse square law, the intensity of radiation is ____ proportional to the ____ from the source of radiation.

A) directly; distance
B) directly; square of the distance
C) inversely; distance
D) inversely; square of the distance

Question 18

When low kilovoltage peak settings are used (65 kVp to 70 kVp), a film with ____ will result.

A) high contrast
B) low contrast
C) many shades of gray
D) Both a and c

Question 19

Which of the following changes will increase x-ray beam intensity?

A) Decreasing the kilovoltage peak
B) Decreasing the milliamperage
C) Decreasing the exposure time
D) Decreasing the source-to-film distance

Question 20

Milliampere-seconds is a combination of milliamperes and:

A) Density
B) Contrast
C) Voltage
D) Exposure time

Question 21

Aluminum filters:

A) Remove more penetrating x-rays from the beam.
B) Decrease the mean penetrating ability of the x-ray beam.
C) Remove high-energy x-rays from the beam.
D) Reduce the intensity of the x-ray beam.