Deck 7: X-ray Production

Question 1

Bremsstrahlung x-rays are produced by _____ at the target.

A) outer shell excitation
B) slowing electrons
C) K-shell interactions
D) L-shell interactions

Answer 1

slowing electrons

Question 2

Electron interactions at the inner-shell of the target atoms produce _____ radiation.

A) gamma
B) Bremsstrahlung
C) characteristic
D) all of the above kinds of

Answer 2

characteristic

Question 3

Most of the x-rays produced at the target are _____.

A) bremsstrahlung
B) characteristic
C) gamma
D) beta

Answer 3

bremsstrahlung

Question 4

Characteristic x-rays are produced by _____.

A) braking electrons
B) excitation of outer shell electrons
C) nuclear fragmentation
D) released binding energy

Question 5

Approximately _____ of the kinetic energy of the projectile electrons is converted to x-rays at the target.

A) 1%
B) 10%
C) 50%
D) 99%

Question 6

Characteristic K-shell x-rays have an effective energy of _____ keV.

A) 0.6
B) 3
C) 12
D) 69

Question 7

During an exposure,most of the _____ energy of the projectile electrons is converted to _____.

A) kinetic, x-rays
B) x-ray, kinetic
C) kinetic, heat
D) heat, kinetic

Question 8

The efficiency of x-ray production increases as _____ increases.

A) mA
B) kVp
C) time
D) both A and B

Question 9

The _____ of an x-ray beam is higher when the peak of the emission spectrum is further to the _____.

A) quality, right
B) quantity, right
C) quality, left
D) quantity, left

Question 10

Most of the heat generated at the target is due to _____.

A) inner-shell ionization
B) outer-shell excitation
C) nucleus bombardment
D) K x-rays

Question 11

At 55 kVp,_____ of the x-rays produced are bremsstrahlung.

A) 15%
B) 80%
C) 100%
D) none

Question 12

The efficiency of x-ray production is _____ the tube current.

A) indirectly proportional to
B) directly proportional to
C) not affected by
D) strongly affected by

Question 13

An increase in kVp would _____ the _____ of the emission spectrum.

A) increase, position alone
B) increase, amplitude alone
C) increase, amplitude and position
D) not affect, amplitude and position

Question 14

The useful characteristic x-rays from tungsten targets are ___-shell x-rays.

A) K
B) L
C) M
D) N

Question 15

Projectile electrons travel from _____.

A) anode to cathode
B) cathode to anode
C) target to patient
D) inner shell to outer shell

Question 16

An increase in mAs would _____ the _____ of the emission spectrum.

A) increase, position alone
B) increase, amplitude alone
C) increase, amplitude and position
D) not affect, amplitude and position

Question 17

An exposure taken at 100 kVp would have a continuous emission spectrum with a maximum energy of _____ keV.

A) 30
B) 69
C) 100
D) 140

Question 18

At the target,the projectile electrons interact with _____.

A) outer-shell electrons
B) inner-shell electrons
C) atomic nuclei
D) both A and B

Question 19

The quantity of bremsstrahlung radiation increases proportionately with increased _____.

A) kVp
B) mAs
C) filtration
D) rotor speed

Question 20

The production of heat at the anode is directly proportional to _____.

A) rotor speed
B) filament current
C) kVp
D) tube current

Question 21

The discrete portion of the x-ray emission spectrum would change position with a change in _____.

A) kVp
B) target material
C) voltage ripple
D) both A and B

Question 22

A 15% increase in kVp is equivalent to _____.

A) increasing the mAs 15%
B) doubling the mAs
C) increasing the mAs 1 1/2 times
D) tripling the mAs

Question 23

The amplitude of the emission spectrum with a _____ generator is _____ it is with a three-phase generator.

A) single-phase, lower than
B) high frequency, lower than
C) single-phase, higher than
D) single-phase, the same as

Question 24

How does added filtration affect the emission spectrum?

A) increased amplitude and a shift to the right.
B) increased amplitude and a shift to the right
C) reduced amplitude and a shift to the right
D) reduced amplitude and a shift to the left

Question 25

Changes in _____ result in directly proportional changes in the amplitude of the emission spectrum.

A) mA
B) time
C) kVp
D) both A and B