問題一覧
1
Projectile electrons travel from _______
cathode to anode
2
During an exposure, most of the ________ energy of the projectile electrons is converted to _________.
kinetic; heat
3
At the target, the projectile electrons interact with ________.
inner-shell and outer-shell electrons
4
The efficiency of x-ray production is __________ the tube current.
not affected by
5
Most of the heat generated at the target is due to _________.
outer-shell excitation
6
The production of heat at the anode is directly proportional to _________.
tube current
7
The efficiency of x-ray production increases as _________ increases.
kVp
8
Approximately _______ of the kinetic energy of the projectile electrons is converted to x-rays at the target.
1%
9
Electrons interactions at the inner shell of the target atoms produce ________ radiation.
characteristic
10
The useful characteristic x-rays from tungsten targets are _____ -shell x-rays.
K
11
Characteristic K-shell x-rays have an effective energy of ______ keV.
69
12
Most of the x-rays produced at the target are ________.
bremsstrahlung
13
At 55 kVp, _______ of the x-rays produced are bremsstrahlung.
100%
14
Bremsstrahlung x-rays are produced by _______ at the target.
slowing electrons
15
Characteristic x-rays are produced by _________.
released binding energy
16
The quantity of bremsstrahlung radiation increases proportionately with increased _______.
mAs
17
An exposure taken at 100kVp would have a continuous emission spectrum with a maximum energy of ____ keV.
100
18
The ______ of an x-ray beam is higher when the peak of the emission spectrum is further to the ________.
quality; right
19
An increase in mAs would ______ the ______ of the emission spectrum.
increase; amplitude alone
20
An increase in kVp would _______ the __________ of the emission spectrum.
increase; amplitude and position