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Bushong Ch 7&8

Xray Production & Xray Emission

QuestionAnswer
Projectile electrons must travel from cathode to anode
At 100 kVp, approximately _____% of the x-ray beam is characteristic 15
During an exposure most of the ________ energy of the projectile electrons is converted to ________. kinetic, heat
At the target, the projectile electrons interact with outer shell electrons and inner shell electrons
The efficiency of x-ray production is ______ the tube current not affected by
Most of the heat generated at the target is due to outer-shell excitation
The production of heat at the anode is directly proportional to tube current
The efficiency of x-ray production increases as _______ increases. kVp
Approximately ____ of the kinetic energy of the projectile electrons is converted to x-rays at the target 1%
Interactions which result in the removal and replacement of a K-shell electron, produce ______ radiation characteristic
Most of the x-rays produced at the target are _______. brems
Bremsstrahlung x-rays are produced by ________ at the target. slowing electrons
Characteristic x-rays are produced by released binding energy
A bremsstrahlung x-ray is emitted from the conversion of kinetic energy
An exposure taken at 100 kVp would have a continuous emission spectrum with a maximum energy of ______ keV. 100
The ______ of an x-ray beam is higher when the peak of the emission spectrum is further to the ______. quality, right
An increase in mAs would ______ the ______ of the emission spectrum increase, amplitude only
An increase in kVp would ______ the _______ of the emission spectrum. increase, amplitude and position
Changes in _______ result in directly proportional changes in the amplitude of the emission spectrum. mA and time
The discrete portion of the x-ray emission spectrum would change position with a change in ________. target material
The amplitude of the emission spectrum is _____ with a ______ generator than/as with a single-phase generator. higher, 3-phase
A 15% increase in kVp is equivalent to doubling the mAs
How does added filtration affect the emission spectrum? reduced amplitude and a shift to the right
If an N shell electron fills a K shell vacancy, what is the energy of the photon produced? 68.9 kEv
An electron from which shell, is most likely to fill an L shell vacancy? M shell
If a filament electron enters an atom with 100 keV, passes the nucleus and exits with no kinetic energy, what is produced? 100 kEv brems
What is the average energy of a beam produced at 90 kVp? 30 kEv
What factors affects the size and position of the x-ray emission spectrum? tube current, tube voltage, and target material
The reduction in x-ray energy which results from absorption and scattering is called: attenuation
The best method for specifying x-ray quality and is defined as the thickness of the absorbing material necessary to reduce the x-ray intensity to half of its original value: half value layer
What affects xray quality kVp and filtration
What affects xray quantity mAs,, kVp, filtration, distance
A compensating filter is used to create a uniform intensity with reference to a part which is not uniform in thickness true
A compensating filter is used to compensate for differences in subject radiopacity true
Created by: lkdickson